When I rebuilt my 997.1 3.6L @72k, I replaced the two scored pistons with good used pistons for $50 each from a shop that had lots of them since most 3.6 rebuilds have owners that opt to upsize their bore. I considered Cerakote for the skirts but opted not to. I also reused my old piston rings since their gap was perfect for the newly re-plated cylinders. In lieu of steel sleeves, I went for the Nikasil (Nickel Silicon Carbide) plating from Millenium Technologies in Wisconsin. They were great! Reuse the head bolts if they're not stretched (never) and use new ARP rod bolts since they are a weak point. New, wider rod bearings with new main bearings and put it back together.

@brentschulz3152

3 ай бұрын

I'm at 77k today and loving it.

@rezilient112

Ай бұрын

Do you have more details and/or video of the process you followed? Where are you located? Doing my research and hoping there is a cheaper solution than the crazy expensive L N route. Thanks.

@brentschulz3152

Ай бұрын

@@rezilient112 I watched various KZread videos. Probably spent more time watching videos than doing the actual work! I'm in Omaha, NE. Still going strong. I just bought a 2006 Cayman S for my son and believe we're probably going to need to rebuild its 3.4L. Maybe we'll try to upsize this one with new sleeves and pistons? What engine are you dealing with?

@MowSow

25 күн бұрын

When I rebuilt my cayman I went with LN 3.8 they came with new JE pistons. I also rebuilt the heads with Hoffman, everything else inside the engine is brand new including injectors, I reused nothing. That car burned oil from day 1, about 1 liter for every 1000 miles, LN says it’s normal, it’s driving so nuts that I’m thinking of tearing it apart again and trying the ones you used, even though the car runs absolutely perfect and smooth and it’s been 80K since the rebuild. I just can’t handle the oil consumption anymore .. what do you think ? How much did it cost for resleeving ? How come you never hear of this company? What’s their around time ?

@samuelhansen8518

16 күн бұрын

@@MowSowcheers from the Porsche FB groups. I’ve seen the steel sleeve horror stories that LN and Hartech show. I’m interested to see what you find since I have a 996 C4S that burns some oil but I am curious if this cheap Nathan solution is permanent enough

10k to re sleeve that block?! Good on you for challenging the Porsche tax status quo. 2k seems fair.

MIne passing 120000 miles, unopened enigne, Spotless ! Heavy track use, oil analysis show no symptoms of bore scoring, scoped the bores in 2021, spotless.... so i sleep well at night

@brentdude2100

Ай бұрын

What year? And trim?

@997GURU

Ай бұрын

@@brentdude2100 2005 997.1 3.8

@MowSow

Ай бұрын

Sooner or later it will happen .. the magic number is 200,000 miles. Get rid of it BEFORE it hits bore score

@997GURU

Ай бұрын

@@MowSow i still sleep well at night

@MowSow

Ай бұрын

@@997GURU of course .. I’m just warning you for the day when the car will make you lose sleep over it, so you don’t

Great video, as always. Regarding the 997.1 GT3, GT2, and Turbo, as you are aware they have the Mezger GT1 engine that have the Nikasil plating on the bores. For reference data, I just had my 997.1 Turbo borescoped while I was having routine maintenance done, and after 117K miles it shows no evidence of scoring. It also does not smoke nor does it use anymore oil than the day I bought it in 2008. This has been my daily driver for 15 years, and it has not been modified or tracked. Oil change every 5K or 6 months. Thank you.

A couple of comments about this video. A rebuilt engine from Harteck (world class builder) is not $30k. I believe the cost is between £11k and 13K. If you follow Porsche Club USA, you will discover the cause of bore scoring on 996, and Mk1 997 plus Boxsters. Bottom line, probably the accountants pushed the engineers to dispense with Nikasil coating on the bores. They replaced it with cheaper Lokasil which in this application was a disaster and is the cause of bore scoring. Switch back to Nikasil coated bores and the problem is fixed. Fitting iron bores I suspect will induce corrosion between the bores and the casing as you will end up with dissimilar metals and with the surrounding water will induce electrolysis.

@Robert-un3cf

7 ай бұрын

At minimum, it will change things like the cooling performance of the engine, adding another thermal interface between the Al and iron. Definitely not Porsche spec any more at that point. There's a reason they didn't use iron cylinder liners in these engines.

AWESOME… always wanted to see you both working together. What treat! Thank you.

Brilliant and always good episode here. Great thanx from Sweden (2006 Cayman S manual here) Thanx Nathan..

BMW doctor Dean is rebuilding another 997 C4S he’s purchased 🙂 people are trusting him but no trust you why is this?

@Robert_Stern

20 күн бұрын

Because this guy is a cowboy “BMW Doctor” isn’t that’s where these two ain’t the same. BMW Doctor will spend thousands rebuilding cars or fixing them to perfect or like new condition. This guy however, is a bodge job and cowboy and will use whatever to fix it to try avoid buying new parts hence why BMW Doctors channel is blowing up on forums and the groups for the Porsche content he’s become recognised even by the best in the game with Porsche now he owns 3 and this clown don’t own 1 👍🏽

Glad your showing this, I have always thought this could be done way cheaper than what we see here in the USA. Question for you, where do we find a manual so we know how to disassemble with specs to reassemble as well?

Great to see you two working together 👍🏻

So glad to see this video!!! I am rebuilding my 53k mile 2005 997 3.6 and the engine looks JUST LIKE THIS!!! You might want to video taking that b*tch of a transmission off of the block. There's no videos on youtube that I could find and it's really hard to figure out how to remove it with that adapter plate and those hidden backwards bolts on the bellhousing. Thanks for the good work, Nathan!!!

@BMWDoctor

10 ай бұрын

That was not a easy task… that took both of us a lot of force and lifting and turning the gearbox and engine upside down to even do it. Getting that gearbox off was probably the most hardest part of the job I’m dreading putting it back on! But I must say overall it’s a solid Transmission and I love the fact it’s a Mercedes transmission as I know they are solid and parts are readily available for these. Haven’t actually drove this car as of yet but I cannot wait too

Isn't the piston skirt supposed to have a iron coating on it so that there is a dissimilar metal? Or is it different on this engine that other M9X engines i have seen?

He’s just finished the rebuild and it’s running perfectly. I would not listen to this guy thank the lord his friend come to his own senses and didn’t reuse them pistons I wouldn’t trust this guy to rebuild or touch nothing hence why his friend probably rebuilt it himself in the first place. This guy is a tool 😤

@MowSow

Ай бұрын

I was literally screaming .. NO .. No .. NOOO each time he said I will reuse the skirt stripped pistons

@user-co9zs9bl7k

26 күн бұрын

@@MowSow I know man even I was 😡 this guy was trying to give this guy bad advice and glad he didn’t listen to him I watched his rebuild from start to finish and didn’t listen to a word this guy said he put about £18k into the rebuild with everything but at least it’s built properly.

The pistons will be riding in a steel sleeve bore and the aluminum piston skirts will not seize to that material.

Nathan, standing at the back of the car and looking forward, which way does the crankshaft rotate, CW or CCW? And where is the scoring happening on Bank 1 and Bank 2, at the top or bottom surface of the cylinders?

Hey, you and the BMW Doctor! Great!

@Danielgibson1981

10 ай бұрын

That’s my guy right there! That was my old car and glad I got to watch this as Dean said him and Nathan were stripping it down. Good to see them both together finally can’t wait to meet Nathan when he comes back as I didn’t get too meet him when he was over this time. Luckily he’s coming back over so I did say to Dean I would come and see him it’s just so good to see my car being restored.

Mine had bore scoring at 30k miles, as well as some crank bearing wear. Car had been serviced very regularly. I ended up getting a rebuild to 4.3 litres with Nikasil liners, forged pistons and rods and over 450bhp. It’s an absolute torque monster now and a real riot.

@whaws

9 ай бұрын

Where did you get the engine built?

@user-qn6yt3zx3w

9 ай бұрын

@@whaws Flat 6 innovations.

@whaws

9 ай бұрын

@@user-qn6yt3zx3w how much did it cost for the 4.3 build? Their prices and descriptions seem to be a bit secretive other than what other people said on the forums

@user-qn6yt3zx3w

9 ай бұрын

@@whaws was around 50k

@MichaelMeyer93

9 ай бұрын

@@user-qn6yt3zx3w please please please post videos! Is this at sea level? I am at the point of do I want a turbo instead of my 4s, or just send a big NA build?

Could ethanol in fuel be a part of the bore scoring issue? I have read about that it is bad to briefly starting the engine and shutting it down may cause condensation that may eat at the liner coating. Adding to that you may have unburned fuel with ethanol mixed in.

The pistons skirts need to be measured with a micrometer to see if they're still in spec

Welcome to England Nathan!🇬🇧…you’ve brought some warm weather with you😉

Is the boar scoring from not burning premium?

Send pistons out to be coated, adds lubricity and fills minor scratches/ imperfections

Those wear marks match the shape and reach of the piston skirt, a mixed-domain bearing interface (both hydrodynamic and boundary lubricated) that is not provided continuous oil pressure. It relies on splash and spray lubrication of the cylinder wall to prevent it from being metal-on-metal. In a flat engine, the skirts rest on the lower half of the cylinder. At rest, this presses oil out of the interface and allows the plain aluminum skirt and Lokasil cylinder wall to touch without oil between them. That's a recipe for scoring. The problem with this theory is that it could have been fixed by using a skirt coating. While this wasn't a popular technology in 1998, startup wear like this is something Porsche would have known about from decades of making engines. It seems like the change to these cheaper cylinder coatings caught them off guard, but I don't really understand why they would continue using incompatible materials like this if they knew they could easily make them compatible with a small post-machining change to the piston. So either that wouldn't have fixed it and there's a bigger underlying issue, or Porsche was in an era of being run by accountants.

Can anyone recommend a place close to Raleigh North Carolina to get sleeves done?

Good! Nathan is taking care of UK’s Projects!!!

GT3 & Turbos of this generation have a completely different engine and those cylinders were lined with Nikasil instead of Lycosil like the carrera cars. That's why they don't suffer from bore scoring. That's why Hartech and LN Engineering use liners with Nikasil.

I had the same issue with my 997.1 3.6 C4, so I upgraded it to a 3.8 at Deman Motorsport in NY. It cost a little over 20k. It was year 2018 though.

He's right, too damn expensive. Especially if you're going to track it.

Aside from the issue of liner coating delaminating, I wonder how Porsche lubricates the bore on that engine? Seems they would have block mounted oil sprays to cool the pistons...? Or, drilled the rod big end to spray without creating too much windage loss..? I could be wrong.... maybe not an issue. Anyone have insight into this? Great video. Thanks

@chrispompano

9 ай бұрын

Great idea just need to be sure to run a heavily weight oil & keep tabs on oil press & volume.

The scores you showed are on the upper part of the cylinder? There is a decent fix, k swap it and no more bore scoring 😄 just waiting on a cayman swap now

I would scotchbrite the piston skirts and pop them back in. They are not contacting the bore walls unless the walls wear, which the new steel liners will fix, so new rings, new liners and a tidy up of the piston skirts would be my route.

@MowSow

25 күн бұрын

The coating mahle used is terrible, it will continue to flake and destroy the cylinder wall. Not a good idea to use them regardless of what you say how they should be treated

Good to see you again

Interesting to see a different approach to save some dollars

996 turbo owner here with 150k miles on the clock. I have receipts of a bunch of engine work for a blown head gasket, and a shop reassembling the engine incorrectly. No record or signs of bore scoring though when the case was split. The previous owner did upgrade the rods though (while you’re in there)

@user-qn6yt3zx3w

10 ай бұрын

The mezgher engines don’t score their bores thanks to Nikasil liners. It’s only every other Porsche, all the way up to 2020 that will eventually score.

@laapulsford

8 ай бұрын

Thats because your engine has Nikasil coated bores.

100,000 miles? Do even if you guys do that 4.0 upgrade, the fix will be considered to be temporary?

They're using Alusil cylinder treatment again. It didn't work in the 1970's and it doesn't work now. Nikasil works. It's more expensive, but it never wears out. You even need to buy a diamond hone so your new rings will seat in a Nikasil cylinder. They cheaped out in the center of the engine. WTF?

@MowSow

25 күн бұрын

New environmental regulation forced them to switch to that coating .. in addition to a faulty cooling system in engine block system itself causing cylinders on one block to heat up too much and going oval. Don’t forget that Porsche was also struggling with bankruptcy during that time if it wasn’t for Toyota saving them by revamping their manufacturing process, and the success of the Boxster and the Cayenne later … because of that now we still have an amazing car company making epic cars

I would weigh them vs non score ones and see how much metal was loss. Then multiply loss mass vs max rpm to see if vibrations work into engine

Steel linings cool at a slower rate than alum. You'll have heating issues with steel linings. Vertex sells rebuilt engines in the US using steel linings. If you want to roll the dice on heating, buy one of their engines for around $12K w/ exchange.

@BMWDoctor

9 ай бұрын

Why would I do that when it’s only £1400 to have steel liners fitted ? I’m in the Uk not the USA I would never pay anyone £12k steel liners don’t have any issues. The only time issues arise is from track use which I do not intend to take this to a track and I will tell the new owner when they buy it this will no longer be a track car

@roots4x

8 ай бұрын

A ton of cars stock use steel liners on an aluminum block. What’re you talking about.

@terrylessmann2274

8 ай бұрын

@@roots4x I never said you couldn't use steel liners, I said they dissipate heat at a different rate than aluminum. There are Porsche engine rebuilders in the US that use steel liners (Vertex). But if you substitute steel liners IN A PORSCHE ENGINE that came with factory alum liners, you run the chance of heating issues. If steel is such a great idea, why doesn't Jake Raby or L&N use them (or offer them) in their rebuilds? They're the 2 most prominent Porsche engine rebuilders. Other manufactured engines may well work just fine with steel liners. But if you have to fix a bore scoring situation in a Porsche, do you want to save a few bucks and then never drive it hard because you might get it hot? My engine was rebuilt in PHX but it has L&N alum liners in it.

@roots4x

8 ай бұрын

@@terrylessmann2274 because L&N is making money hand over fist selling their solution. It’s a good solution no doubt, but it’s too much. So they have to differentiate themselves from everybody else somehow. Not using steel and using aluminum is that way.

I'd buy two used pistons in very good condition and move on......

Can someone make a DIY rebuild video? How to get the engine out and taken apart so it can then be sent off for machining and sleeving by someone else. Then DIY reassembly and reinstall. Any way to save some money on a m97 rebuild would be so much appreciated.

My 987 Cayman S has mild scoring in cylinders 4, 5 & 6. Which company do you use for engine rebuild ? I am on a tight budget, so the silly quotes that are bandied about, like £10k are out of my range. I live in Nottingham. I look forward to your response.

@TheBestWanted112

2 ай бұрын

I would be also interested jf you find something.

@petrovkristian1047

2 ай бұрын

Maybe contact BMW Doctor on his channel this guy doesn’t know nothing. BMW Doctor rebuild on his own without this guy and he’s rebuilding another. Maybe he will help you? And they no use any company BMW Doctor Dean rebuilds them himself

@mikefranky

Ай бұрын

I'm from Neath Swansea Area...I used D9 Auto tech in Bridgend Area roughly 5 years ago...My 997.1 had scoring 4 5 6...I was billed roughly £6500 Full strip rebuild Inc ims retro fit...👍

@richardparker7614

18 күн бұрын

@@mikefranky how have you found the car since he the re-build are you happy with the work done by D9 ?

@mikefranky

16 күн бұрын

@richardparker7614 .....Car has covered roughly 10,000 miles and no issues...👍 I'm using Millers 10.50 and magnetic sump plug (£6 From amazon)....All good so far...👍 How's your 911 running?....

Wrong Oil viscosity used in this engine Push hard on the cold engine and you get a Gift. 0W40 best engine oil only as AMG Those Castrols 15W60 are the beauty of the problems. Same as BMW idiots using 15W60 to kill bearings.

@997GURU

10 ай бұрын

Totally agree

@lareau6

8 ай бұрын

I agree too. Been tracking mine since 10 years with the cheap 0w40 changed every 3.5k (a season here). No issus

Could u ceramic the part. I know hot rudders do this to their motors.

I'd re use em after a good scrub with a scotch Brite. Don't polish em, needs some roughness to hold the oil

Who did you use in the UK to machine the block for the new liners? Thanks

@BMWDoctor

8 ай бұрын

I used a good friend of mine local to me who does it been doing it for 20 years on Porsches it’s all he does. In the end it only cost me £1395 for 6 new steel sleeves that was it but I had to get 4 new pistons which I did as I didn’t trust using the ones that was badly scratched up engine is going to be back together soon as I’m waiting on a few other upgrades

@Markymark1408

7 ай бұрын

@@BMWDoctorHow much do you charge for the end to end service (engine removal to repair) I have a bore scoring on cylinder 4 and 6 on a 997.1 am based in South East UK, Thanks

@BMWDoctor

6 ай бұрын

@@Markymark1408 not a problem email me and we can talk properly

@paulsteadman4294

6 ай бұрын

If he's in the UK, are you able to share your friends details who did the liners? Thanks

@petrovkristian1047

2 ай бұрын

@@paulsteadman4294BMW Doctor won’t share this he’s stated on his videos he does them himself with his friend I think cost is £1200 for them but cheaper for BMW Doc Dean he has friend in USA and uk who does it

What is the name of the shop and who in the USA can do this? I have access to the machines to do this job but I like to know whats the best materials in steel to do this? Whats the new liner wall thickness? what finish do they have? what is the ID and tolerance? is it a press fit or a shrink fit?

@petrovkristian1047

2 ай бұрын

In USA it’s much cheaper they can fit iron liners for $1200 BMW Doc Dean knows the place as he’s said on many of him videos! He has place in USA and UK as him and nathan were selling resleeved cases in the USA.

I’ve hear a theory that refers to the pistons should be specific to each bank.. (left and right) it’s been noted that all 6 pistons are say left hand or designed for the drivers side (in America)… that’s maybe why the score first on the right bank?

Harteh only warranty the work for 120k or 1 year whichever comes first

hey, I live in England with a bore scored 996, would be interested in getting in touch for repair

@user-co9zs9bl7k

3 ай бұрын

Why not contact “BMW Doctor” directly? This isn’t his channel he’s also just repairing another bore scored 997 thank god he don’t have this 🔔 end of a guy helping him

I’d say those skirts are ok to go back in as they are after a clean. Use new rings obvs

@petrovkristian1047

2 ай бұрын

You are problem on this channel you and nathan get together and build a engine I’m sure it will last 5,000 miles before it blows up just like everything nathan has touched let’s not forget the yellow Porsche he had and also the red Porsche both he messed up which the person who buy did all videos on it.

The coating that mahle puts on the pistons is terrible.. and not the moly black stuff... the stuff everywhere else flakes off and becomes debris. In my opinion.. a naked piston or one with line 2 line skirt coating would be far better than the mahle factory piston. If you were trying to save those pistons l2l the skirts to 70 percent of skirt clearance and call it good, they will wear in to their perfect fit.. than stop giving you a much slicker surface to ride on.

6:45 Horse puckey. We DO know. I have seen many 996/7 GT3s with many miles and many track miles. No issues. Not the same motor, not the same issues. The Mezger has its own issues, but the long block is more or less bomb proof. Please don't give people a reason to say fake news.

My 996 turbo has 155K no smoke no oil consumption.

@theJeffRuhl

10 ай бұрын

Totally different engine

A couple things - 1- Where is this place that will sleeve the Porsche cylinders? HELP ! 2- there are places that do all kinds of piston and engine coatings. I have used Swains in NYS. These places now offer skirt coatings that will add diameter to pistons and protect them. They all offer all kinds of magic coatings. This option I believe is a viable option and will fill the void of just Knurling piston skirts. Thanx for the videos! PS i think you should invest in the art of valve work. A truly satisfying job. I have been using 50-degree seats in lots of stuff with great results.

@BMWDoctor

8 ай бұрын

It’s a good friend of mine who does it. They have been done now which was £1395 for 6 new steel liners only true he’s a very good friend of mine and I trust him as even before I got into Porsches he was doing this for 20 years and he’s got many cars driving around on steel liners that have passed 40k with no issue I mean his one he done 5 years ago and he’s done 73k since the rebuild and had no issues and he has the normal carrera not the s. I would reccomend finding someone you know and trust and who can back up their claims I was lucky to see the whole process and I can tell you it really ain’t a easy job on these people think it’s just bore the old ones out and slot the new ones in it really isn’t it was a 4 day process in total to complete them and I learned something new.

I can't beleave that it is a simple "flat engine issus" or "gravity issus" beceause mine would also have been affected. And my 200kmiles subaru flat six too. This has got to have a cause that make it as varriable as it is. Anyway, if it happen to me too I'll buy a short block.

Interesting episode. Why does it have a Mercedes transaxle in it??? Never heard of that one before. I say find used pistons to replaced the scored ones, screw the re-coating, and get some new rings for all 6 - the rest of the build is unlikely to win a concours award as it is :) and it's probably worth properly mating the new sleeves and rings, no? Why not do the wider main bearings too? I get that the bearing carrier's intact and seems OK, but if you're going to track this again, the wider bearings would help any issues there. Hartech's just a few miles away :)

@miketdavies

10 ай бұрын

@@BMWDoctoroh I definitely didn't want to imply you should go there for your rebuild - you've got what you need! I meant they offer wider main bearings that are highly rated, great "while you're in there" item since you're this far. If you're not tracking the car any more, they are probably overkill though. (I'm just jealous since I'm across the pond in Canada, and Hartech parts are not as accessible here). As for the concours joke, I'm more referring to the stuck-up purists who will piss all over a good car because it didn't follow the Rennlist/Raby recipes for rebuilding. I like what you're doing, and you know that you can address any future issues if needed. Steel liners are OK in my books :) I'm actually considering this path for my current rebuild. For the pistons, I was suggesting you could save a lot of money finding two used pistons to replace the scored ones, vs grinding/polishing those ones out. New pistons are indeed silly, unless you were going to overbore when you were resleeving IMO. Sounds like you have the rest of the maintenance items too, I did water pump, low temp tstat, all gaskets, chain tensioners/rails, etc last rebuild. That stuff adds up quick! That's interesting about the Merc gearbox - what's it out of? I've never heard of that swap before.

@BMWDoctor

10 ай бұрын

@@miketdaviesthanks for that I appreciate it! The gearbox is from the AMG Mercedes and your right that’s what I did do I got very lucky I found someone who knows someone who had 4 good used pistons from his rebuild from cylinder 1,2,3,5 which was all fine no scratches or nothing I got them for £100 😅 so it’s all good on my side now. Don’t need to use them ones. We are going to be taking the pistons off anyway as you know you can’t install the case halves with the pistons intact so I have it all ready to go in just waiting on the case halves now 😅 I can’t wait to bolt everything on and drive it I already got my new IPD plenum to go on and the new throttle body GT3 so I’m looking forward to it with the headers and the new exhaust system

@miketdavies

10 ай бұрын

@@BMWDoctor awesome, good luck once you get your case halves back! Hope we get an update.

No way I'd go that deep and put such badly damaged pistons back into it. You cant have aluminium skirts next to the aluminium bores. Thats why that piston is designed with a ferrous coating. New pistons is the very least that should be done.

Scotchbrite and send it!

I became interested in this saga, when I saw the Wheeler Dealers TV Show & mods & Hartech milling the cooling jacket. See YT vid: "Porsche 997 Carrera II: How To Fix Bore Score Damage | Wheeler Dealers" Here's my solution if its a cooling problem: Why aren't the Porsche owners not using EVANS Waterless Race Coolant???? See my in-depth commentary on your other vid titled: "THE TRUTH !!! The Porsche Bore Scoring Money Scam Revealed !!!" ..... I made the long post today about EVANS, Schaffers Oil, Renewable Lubricants Bio Oil, & even Frantz Bypass Oil Filtration. I can repost it here but YT kept deleting my comments since I posted YT links, so I may really post it in a reply to myself below. Lets see if YT deletes this post.

@chrispompano

9 ай бұрын

WOW... Shame on Porsche for doing this. Are they still mad over losing the war! Of course, they are supporting a $million dollar aftermarket industry, & a worldwide billion dollar Porsche addiction! Here's my thoughts for you all you Poor Porsche owners : Having studied tribology at a remedial level for 25yrs, I just sent an email to Renewable Lubricants about their highly advanced Oleic Vegetable Base Oils to see if they can offer a solution. I think it might be in their chemistry with their unique patented formulation & anti foaming agent in the oil to stabilize the oil film over conventional synthetic POA base stocks & their the use of Antimony vs. Moly & ZDDP in other performance oils, which might be a viable solution in stabilizing the oil film breakdown from heat & pressure contributing to bore score. . And when you're done with the oil, you can fry chicken wings it it! Just joking, especially since they use Antimony, but their base stocks are vegetable esters! To learn more about what I'm trying to convey, See the well known lubrication forum BITOG titled : " HOBS base oils and implicit/inherent FM " Or Science Direct Paper: " Biolubricant product development." The same published paper as posted on BITOG lubrication forum. I learned all about your Porsche Problems from the TV Show : Wheeler Dealers: Porsche 997 Carrera II: How To Fix Bore Score Damage | Wheeler Dealers. Here's another suggestion for existing bore score: Schaffers Oil has been around for 175 yrs, & is considered an industry leader in industrial lubricants & as a boutique-oil blender. They have very robust racing oil formulas., including a very inexpensive highly doped formula of Antimony (expensive anti-wear agent) & it has a viscocity improver (thickens oil by 5-10w which is actually beneficial) Schaffers MOLY EP 132 Oil Treatment, which is misleading & has very little Moly, but tons of Antimony! Can you imagine a $14 additive working to stop, or as a preventitive for bore score to support that horizontal piston & will most likely stop oil burning & is formulated to do so but it needs to be used with a low Moly 20/50 oil as molecularly, Antimony competes with Moly. A really good blend would be Renewable Lubricants 20/50 (no Only or Zinc) & Schaffers EP 132 for an oil burner!!!!!!!!! And wait for the magic to happen, + the motor is going to get really quiet from the chemistry! Another thought is every Porsche should be using a well known NHRA SCCA NASCAR track Race Waterless Coolant called EVANS Coolant, which allows you to run a 0-psi cap its so efficient, & all that reduction in coolant pressure saves the cooling system & putting less psi on lower bore seal from failing pushing coolant past the seal into the oil. This coolant will not cavitate or cause hot spots which I think is the major problem of sinking liners just like on Big CAT, ISX, & Detroit Diesel that have the same problems of bore scoring, & sinking liners!!!!!! I hope everyone will think about this connection that spans 2 very different engine platforms & methodical fix. EVANS has also been used for years in the performance & classic car market , but you need to flush & use their coolant flush-prep to remove all Ethylene Glycol & its anti corrosion additive coating from the cooling system for the EVANS Propelyne Glycol chemistry to work along with removing as much water as possible. Its a methodical process. Also they recommend removing the thermostat, but not sure in the case of short trip driving. They can answer that question. The concept is to move high volumes of coolant thru & around those cylinder liners & avoid thermostat restriction, or modify a thermostat for higher flow bleed holes. Ask EVANS engineers what to do, they know. The coolant has better thermal efficiency & management which is what these motors obviously need. Anyway, I read that your people recommend Joe Gibbs DRIVEN oil500ppm Moly, with MoDTC ( as its the best of many forms of Moly ), but High Performance Lubricants (boutique oil blender) is a far more advanced synthetic Ester POA base stock & has 800+ppm MoDTC in their Premium Plus passenger car engine oil. ( High Performance Lubricants’ Premium Plus passenger car engine oil ) These guys are not snake oil at $20 a qt +++ & also are a industrial lubrication blender. You really do get what you are paying for with boutique oil blenders vs. all the corporate oil brands. HPL, Schaffers, RLI, Miller's Oil, ect...are higher end oils vs. Redline, Amsoil, & DRIVEN, LubroMoly, & Mobile1 which is at the bottom of performance oils. Also, I think you guys should be considering a Frantz ByPass filtration system as its the most compact of all the bypass oil filters on the market. These filter down to 1 micron & "clean" the oil, not just filter it at 20 micron industry standard however I'm not sure about if it will remove Antimony from the oil in Schaffers. I'll send an email to my contact & post back. I think all Porsche owners should start a thread on the lubrication forum BITOG where there are 2-3 chemical lubrication engineers that often chime in. These gents can definitely solve the bore score problems, but are very careful in their words as they are retained & connected to many in the OE. ! All in All, its probably best to but Gap & Arson insurance thru Grundy or Hagarty for a replacement car when bore score starts! LoL. Shame on Porsche. And here I thought the Bosch Jetronic was Germany's revenge for losing the war, now I know what's #1 on that list....!

@laapulsford

8 ай бұрын

It's not a water problem. Porsche downgraded the coating on the bores of these case to Lokasil. Nikasil was too expensive. Replace the bores with Nikasil and the its good for 200k miles.

get a couple of used factory pistons from another car is my vote.

You should show the wrenching part, if you want your channel to grow

@petrovkristian1047

2 ай бұрын

BMW Doctor Dean did on his channel that’s who’s car this is anyway. This man doesn’t own 911 never has BMW Doctor has all Porsche

Do the 911 cars from the 70s and 80s do this? If not why not?

@911engineguy

10 ай бұрын

They don't have piston skirt coatings on the old cars. That's what has failed on these newer ones.

@Mr10usdad

10 ай бұрын

@@911engineguy thanks for the info!

@terrylessmann2274

10 ай бұрын

Those engines used nikasil linings, so no issue. When Porsche switched over to mass production of their water cooled engines, they went with Locasil linings, which we're finding isn't as strong. GT3, GT2, and turbo engines still use Nikasil - that's why they don't bore score.

@warrenlucier5796

9 ай бұрын

No, as they had iron barrels and switched to nikasil plated aluminum barrels later on in the air cooled engines. The water cooled engines (1st gen) had a ferrite coated skirt and it resisted galling from the locasil cast in sleeves better, but this material was outlawed. The 2nd gen had to use a different material on the piston skirts along with a change in the locasil sleeves and they became less durable.

Why on Earth would you do all that and then put it together with worn out Pistons? Forged or cast? Throw that worn out junk away.

New pistons, never cheap out on a Porsche engine.

@BMWDoctor

8 ай бұрын

That’s what I did

No you can't 're use the pistons from experience

Spend the money for new pistons. You already have a lot more value invested in breaking this engine down.

If you knew a little more about how bore scorning starts you would know for sure what to do with the pistons.

@jimp1646

10 ай бұрын

*scoring

These bastards in Australia are asking $30,000 to fix bore scoring!

@remington7615

5 ай бұрын

I'm in Australia who quoted you that much ?

@darkdance3002

5 ай бұрын

@@remington7615 sorry for late reply .... both the 2 aftermarket specialists i called in Adelaide and Sydney (or Melbourne .. i think) quoted me .... do you have an email I can contact you on?

Porsche should man up and replace or pay for all these manufactured defected engines. From jump they are overpriced and cheaply built.

@PointNemo9

10 ай бұрын

No way they could afford it

bore scoring is the silent killer that will impact many Porsches. Dealers/sellers are turning a blind eye and hoping they can pass off the problem to a new owner.

I stopped watching at minute 2.10 when they said to scotchbrite the side of the pistons where bore scoring had damaged them. The coating on these are incredibly important to stop future scoring you cannot assemble an engine with this coating missing. Very bad rebuild. This should be a video of what not to do!

@BMWDoctor

9 ай бұрын

I will not be doing that as he said I was hesitant about doing that already. I bought new pistons as I didn’t feel comfortable using them pistons again.

@petrovkristian1047

2 ай бұрын

Luckily BMW Doctor did not listen to his advise and after this I see why Dean rebuilt this engine on his own. If you watch Deans rebuild videos he’s very good and doesn’t cheap out not like nathan anyway. Hence why he don’t have any 911 and BMW Doctor has two now

As you are going to sleeve it.....just polish the skirts.......