Пікірлер

• 
  @charlesgraham99542 сағат бұрын

  at 16 i ported a set of J heads on my 79 360 engine and put a set of used long tub heads on my 79 step-side. i was surprised in the change even with a stock cam. of course, when i got older and cars became a money pit lol i ended up stroking that engine. i even round off the intake, most people forget the intake.

• 
  @zyroonconsle60696 сағат бұрын

  I have a 92 350 Everything brand new Exept the heads and pistons Eagle crank Stage 4 Cam 750 CFM carb I wondering if I keep the stock 193 heads I have would all the power upgrades be useless it’s going into a 90 camero RS

• 
  @servediocylinderheads3 сағат бұрын

  @@zyroonconsle6069 Heads flow about 185 cfm stock. It will not match a stage four cam, if it is a long duration cam. I would do at least some bowl work and spring upgrade. Thanks

• 
  @bcbloc0218 сағат бұрын

  Interesting to see the swirl difference.

• 
  @thomsoncarter3121Күн бұрын

  Thanks for this. I just broke through on my e7s.

• 
  @servediocylinderheadsКүн бұрын

  @@thomsoncarter3121 Easy fix. No worries

• 
  @servediocylinderheadsКүн бұрын

  You may not need that much removed unless the rest of the port is really working.

• 
  @bcbloc024 күн бұрын

  I don't put a lot of stock into the importance of finish for a daily use type deal because after a couple of years of running the texture is going to be totally different once it is coated in fuel and oil residue.

• 
  @thomsoncarter31215 күн бұрын

  Would you go over the larger valve? I am assuming it is a shorter chevy valve. Thanks

• 
  @servediocylinderheads5 күн бұрын

  @@thomsoncarter3121 I have done Chevy and Ford valves. Valve train geometry needs to be looked at. Thanks

• 
  @JH-oh1in5 күн бұрын

  If he is doing EFI why not to the sploder intake? They litter the planet. Or get the truck lower and edelbrock upper?

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  @servediocylinderheads5 күн бұрын

  @@JH-oh1in It is his choice. Thanks

• 
  @jaysaw81516 күн бұрын

  well i got a set and im about to sent them off to a machine shop its going on a hot rod /touring car ..so iwant it to have some shit and git and a lil cam at idle.....seeing all this makes me feel alot better ..used to a prevortec engine was just a clunker to me ..goofy teens putting glass packs on them and making noise ..and noticed they was slow ..my old 283 would would have a wicked sound and the speed...but they are getting rare so i just dont wanna mess with them .and try to get something that parts are plentiful ..every scrap yard has them 80s and 90s trucks

• 
  @servediocylinderheads6 күн бұрын

  @@jaysaw8151 They tune up well. Thanks

• 
  @jaysaw81514 күн бұрын

  @@servediocylinderheads bad news ..the local shop would not do the work to them told him I wanted them fixed up he told me no .,. Told him about the 093 set ..told me bring them ..lot less work alot more outcome ..huh will see

• 
  @servediocylinderheads4 күн бұрын

  @@jaysaw8151 Not familiar with 093 castings. Sorry

• 
  @CraigLandsberg-lk1ep6 күн бұрын

  Hey Andy, unless you are after that rough texture from the die grinder burr, as a sheet metal worker I would hit that shit with a flap wheel while turning like you have done, and if needed go over it with a rexcut wheel or a seaweed wheel (not sure the proper name) like David has shown in previous vids, but love to have seen this and from a sheetmetal workers perspective there is probably 5x times more consumables that you don't know about that could shorten your work time by at least half 😅 respond to me if you need to know more, otherwise am so glad to hear from you or David from Queensland Australia 🌏 man!

• 
  @servediocylinderheads6 күн бұрын

  @CraigLandsberg-lk1ep This is Charlie's channel, but I appreciate your input.

• 
  @CraigLandsberg-lk1ep6 күн бұрын

  Another great video and good to see a newcomer, to me anyway 😅 thanks guys, I really love this Mission Impossible project and hope to see the next vid inline 😅 have been having trouble seeing these videos in sequence

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  @servediocylinderheads6 күн бұрын

  @CraigLandsberg-lk1ep If you go by date, they are in sequence on this channel. Thanks

• 
  @ElvinLeadfoot13 күн бұрын

  TWIRL - Swirl & Tumble DV - King David’s terminology:) I’ll try not to do Monty Phython during a ten day class:) Constitutional Peasant's & Knights of Ni Roger the Shrubbery specialist becomes a head porting technician:)

• 
  @servediocylinderheads13 күн бұрын

  @@ElvinLeadfoot Funny!

• 
  @tonypierce566115 күн бұрын

  What mite be the problem when at high lift the inches of water go down say 25” to 24”

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  @servediocylinderheads15 күн бұрын

  @@tonypierce5661 Vacuum motor capacity has been reached. At that point what I do is keep track of the depression. If I do work and depression drops more I am flowing more air. Thanks

• 
  @gordocarbo15 күн бұрын

  Recommend a good electric die grinder? Bought a foredom pedal speed control My old mutabos had adjustable speeds so pedals would work on them. They finally burned out though Any more info on your (model?) sonic tester? at the point I really need to start using one. Esp for imported alum heads, some areas the metal gets goofy

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  @servediocylinderheads15 күн бұрын

  @@gordocarbo I use a small Dewalt 887? Good for the price. Single speed. I have scr speed controllers. My sonic is no longer made. They do have a new model but I know nothing about it. Thanks

• 
  @gordocarbo15 күн бұрын

  Nice job...really dig your finish work. Are you using any carbide here or just rolling it for the most part?

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  @servediocylinderheads15 күн бұрын

  @@gordocarbo Intskes are all carbide, these exhausts are very small so the throat to the seat gets sand rolled. Thanks

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  @gordocarbo15 күн бұрын

  @@servediocylinderheads Cool. Keep a few worn double cut egg carbides around taht give a similar finish. Finish work is just that..but its like a signature I dig it.

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  @servediocylinderheads15 күн бұрын

  @@gordocarbo Thanks

• 
  @TheEpidemicFla15 күн бұрын

  So, maybe this winter you let me put AC in your garage so it won't be an oven next summer? REAL AC, not that lil portable thingy.....

• 
  @servediocylinderheads15 күн бұрын

  @@TheEpidemicFla All it takes is time and $$$. I have neither!!!! Maybe things will be looking up. Thanks

• 
  @at_383116 күн бұрын

  I like feeling dumb watching smart ppl figure out new ways of finding power

• 
  @servediocylinderheads15 күн бұрын

  @@at_3831 Funny!

• 
  @bcbloc0216 күн бұрын

  I don't care for having the swirl change direction during the stroke, but its probably just my prefrence and no dyno tested theory that it matters.

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  @servediocylinderheads16 күн бұрын

  @@bcbloc02 I don't think it is ideal but I have had engines that did just that and ran very well.

• 
  @approachingtarget.450316 күн бұрын

  I left a comment already but as I said before. When you start thinking about the flow path, include the fuel path. While rotation is mixed with tumble. The fuel likes to stay over the exhaust valves. Concentrate the flow from the divider. Inside out rotation. With the fuel path. The outsides of the port slow down because of the spread. The high speed remains in the middle. Left port spin counter clockwise. Right...clockwise. Another point to think about, is timing. Not ignition, but the entire delivery timing. At 9000rpm, the tumble or swirl doesn't get a chance to complete its journey. It is ignited when it barely reaches the back side of the cylinder. Don't forget the overlap period and what the exhaust vacuum is causing to the intake charge. Straight in and Straight out. No time to tumble or swirl. Another method used to cause low rpm mix is to alter valve timing. Individual actuation of each valve can be tailored to change valve timing. Not on this application but most ohc configurations will alter valve timing on each valve. Nice white board. As I stated. Maybe I should do my next video from the shop.

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  @servediocylinderheads16 күн бұрын

  @@approachingtarget.4503 Good info. Thanks

• 
  @lukesimeon575617 күн бұрын

  Hmmm what an interesting topic ... would love to see back to back dyno tests ... thanks CS very interesting

• 
  @servediocylinderheads16 күн бұрын

  @@lukesimeon5756 So would I. Thanks

• 
  @ts30217 күн бұрын

  Interesting topic. How critical is swirl/tumble when comparing port (wet intake) vs direct fuel injection? Many years ago, a pro stock engine builder commented that he preferred a more gentle swirl motion. His theory was that a slow mixture motion during combustion resulted in a more complete burn (compressed and still mixture around the spark plug) vs a fast motion, where I envision, the flame kernel swirling around creating layers of fresh to burnt mixtures within the chamber.

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  @servediocylinderheads17 күн бұрын

  @@ts302 I would think he is right. Swirl can still help direct injection I believe. Thanks

• 
  @bikeaddictbp15 күн бұрын

  The DI combustion systems evolved in the era of CFD (computational fluid dynamics) and they most certainly consider the path of the fuel particles relative to what the air is doing (they're not treating it as a homogeneous mixture). You can see this in the way the piston crown is shaped on those engines relative to which way the injector is pointed. Some engines have the injector central pointed straight down, others have it near-horizontal between the intake valves on the outside, and the shape of the piston crown is different. The Mazda Skyactiv and the Toyota "dynamic force" engines are worthy of study, and notable in their differences. Both are designed for high-tumble and not swirl. Note how straight the intake ports are on a Toyota "dynamic force" engine - the ports are inclined to the valve (obviously) but very straight. They really, really want strong tumble.

• 
  @servediocylinderheads15 күн бұрын

  @@bikeaddictbp Good info. Thanks

• 
  @jacksonbermingham216817 күн бұрын

  there the holden GM v8 that usually can only run 26 degrees of timing in there got a really flat valve angle to the pistons and they always had good torque range . they have a very iconic exhaust note over the sbc and LS even fords. they just missed the last generation change they needed before LS was used

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  @servediocylinderheads17 күн бұрын

  @@jacksonbermingham2168 Thanks

• 
  @paulgomez93017 күн бұрын

  Very interesting good stuff

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  @servediocylinderheads17 күн бұрын

  @@paulgomez930 Thanks

• 
  @ArvineHarry17 күн бұрын

  Now you have me pondering😂😂😂, recently my engine suffered bent valves and the cylinder head is going to get rebuilt, an X20XEV engine, what chance you have access to a cylinder head from this engine and do an evaluation of it in terms of what came from the factory and what can be done...i'm from Trinidad and Tobago, watching DV's channel, i know he resided here late 80's to 90's, his teachings are well known by the old school mechanics here, for my X20XEV engine, not enough quantity of cylinder head valves were located locally, from luck a cross refferenced engine from the USA market was found, a A20DMS motor from a suzuki Forenza...other engine codes be X20SE, X22SE from chevrolet optra and Daewoo Nubria....looking forward to see if my request can be fulfilled

• 
  @servediocylinderheads17 күн бұрын

  @@ArvineHarry I have no idea what that head is for and I have no special abilities to get that head. Sorry. Bent valve is likely due to too low a spring load for the rpm. Thanks

• 
  @ArvineHarry16 күн бұрын

  @@servediocylinderheads while i lived in brazil, this car was parked, when finally got it started, it had lots of noise which i thought was the hydraulic lifters, it back fired , cut out and did not restart, when check front of engine, the timing belt tensioner got loose and turning crank i saw the belt jumping over crank gear, ended up doing a leak down test - bent valves surely....now a great opportunity to do a porting job...following DV's channel, i'm seeing this head from the factory already being "ported"...i find that to be very unusual...also unusual is how the timing belt tensioner got loose, only possibility is belt spinning it anticlockwise and the time it was parked could have rusted and stuck the bearing, trying to start it could have nudged it loose...anyways, thanks for your attention,

• 
  @servediocylinderheads16 күн бұрын

  @@ArvineHarry I see. Thanks

• 
  @gordonborsboom746017 күн бұрын

  Sounds like it's time to hook up with a 3D printer.

• 
  @inspectorbusiness489217 күн бұрын

  Love the whiteboard and sound effects Charles.

• 
  @servediocylinderheads17 күн бұрын

  @@inspectorbusiness4892 Funny!

• 
  @rolandotillit286717 күн бұрын

  If I wanted to make a poly quad engine, I'd use different sized valves, the ports would be like you suggested, the valves would be nearly parallel to take out as much of the pent roof as possible, make it almost like a diesel engine combustion chamber, and the spark plug in the middle would have a cap over the electrode with little holes drilled around the sides. Finally the piston crown would be shaped sort of like a diesel piston, but without the dish. The piston crown would be in a shape that accents the reduced pent roof chamber. With a direct injection and strong igntion system. Maseratti Nettuno engine in the MC20 uses such a combustion system, minus the offset valve sizes.

• 
  @dondotterer2417 күн бұрын

  Asked Warren Johnson on DragBossgarage live chat. How important is swirl on a Pro Stock engine? He said very important and to make an efficient combustion chamber or you will have a bad one like a HEMI ! I think you have geat ideas I know you will make it work. It would be great if you were able to test that small bore some how. And yes putting the swirl port heads on my 79 350 it spark knocked and has to back the timing off.

• 
  @servediocylinderheads17 күн бұрын

  @@dondotterer24 It isn't

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  @servediocylinderheads17 күн бұрын

  High rpm doesn't need swirl due to high turbulence from rpm.

• 
  @dondotterer2417 күн бұрын

  @@servediocylinderheads that's why I asked him. I should of asked him how much swirl. . But he probably wouldn't give that up.

• 
  @dondotterer2417 күн бұрын

  @@servediocylinderheads I'm confused about the swirl numbers on the last video that Eric did on the LS heads.

• 
  @servediocylinderheads17 күн бұрын

  @@dondotterer24 Don't be, I did testing on the Afr at D.V.'s and Erics numbers are extremely close to what I got. The stocker has no swirl till the ssr goes into transition/ seperation . The Afr has swirl building from low to high at transition. The Afr is a smaller port, smaller valve with less shrouding that flows a bit better. See, easy!

• 
  @theshed880217 күн бұрын

  4 valve diesels have 8 intake ports, and great attention is paid to swirl. I have several diesel heads to look at, and they all adhere to the same basic principles

• 
  @servediocylinderheads17 күн бұрын

  @@theshed8802 I agree

• 
  @pico67ss17 күн бұрын

  Any word on when dv's polyquad ecoboost will be ready

• 
  @servediocylinderheads17 күн бұрын

  @@pico67ss No idea. Thanks

• 
  @rayowens435517 күн бұрын

  When in doubt, just add some swumble! Lol! Great topic and food for thought!

• 
  @servediocylinderheads17 күн бұрын

  @@rayowens4355 Thanks

• 
  @mk1classic17 күн бұрын

  A negative effect may use to your advantage is to let the left exhaust port have reverse flow on overlap while right hand side port is limited.

• 
  @Gary65-fl4rz17 күн бұрын

  Changing the low lift flow on one of the exhaust valves would also help during overlap. Really interesting stuff to think about

• 
  @servediocylinderheads17 күн бұрын

  @@Gary65-fl4rz Thanks

• 
  @pk51227917 күн бұрын

  I believe DV or 1 of his students called it "Twirl"

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  @servediocylinderheads17 күн бұрын

  @@pk512279 I couldn't think of it even today. Thanks

• 
  @derrelcarter940117 күн бұрын

  These fascinate me, is there anybody that can do this do cylinder heads? The ex pro Stock guy he has on the show in the past. They never answered the email at all, same with a DV system cam to be spec'd?

• 
  @servediocylinderheads17 күн бұрын

  @@derrelcarter9401 Not that I know of.

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  @derrelcarter940117 күн бұрын

  @@servediocylinderheads, There was Great Sadness in Mudville this day.

• 
  @derrelcarter940117 күн бұрын

  @@servediocylinderheads, There is Great Saddness in Mudville on this day.

• 
  @servediocylinderheads17 күн бұрын

  @@derrelcarter9401 There is no crying in hot rodding...

• 
  @derrelcarter940117 күн бұрын

  @@servediocylinderheads Truth, we hold it all in & suffer in silence. Like Men!

• 
  @kennethstaszak999017 күн бұрын

  I don't know what DV calls it but I give you my permission to call it stumble.

• 
  @servediocylinderheads17 күн бұрын

  @@kennethstaszak9990 Funny!

• 
  @CrazyTony6517 күн бұрын

  On both my Hondas (H22-A4, K20-Z1), when not on the VTEC cam lobe, staggers the valve opening on both the intake and the exhaust lobes, opening one slightly before the othe and closing the same one slightly earlier. I assume this is to create swirl.

• 
  @amirdoshmanfekan514517 күн бұрын

  Nice video what's your email address to send some head image to you

• 
  @servediocylinderheads17 күн бұрын

  Charlesservedio@ gmail.com

• 
  @amirdoshmanfekan514517 күн бұрын

  ​@@servediocylinderheads Thanks Charlie

• 
  @VGHCX17 күн бұрын

  Tumble is superior to swirl in my experience.

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  @servediocylinderheads17 күн бұрын

  @@VGHCX High rpm? No doubt. I should have mentioned that.

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  @servediocylinderheads17 күн бұрын

  Thanks

• 
  @NotSure72317 күн бұрын

  Tumble motion stops when the piston is getting close to the top of the stroke, when the compression ratio gets above 10.5 or so.

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  @servediocylinderheads17 күн бұрын

  @@NotSure723 Didn't I say that?

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  @NotSure72317 күн бұрын

  @@servediocylinderheads I was talking to VGHCX.

• 
  @alejandro5261217 күн бұрын

  Love this video, almost no info on this topic for 4 valve engines except for DV of course. Greatly appreciate the knowledge!

• 
  @servediocylinderheads17 күн бұрын

  @@alejandro52612 You are welcome.

• 
  @hoost305617 күн бұрын

  Your modern 4 valve diesel head and bowl combination. Volvo does it quite well.

• 
  @oldblueaccord262917 күн бұрын

  3 valve Hondas CVCC. They staggered the intake lobes on the cam.

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  @servediocylinderheads17 күн бұрын

  @@oldblueaccord2629 Excellent point! Thanks

• 
  @oldblueaccord262917 күн бұрын

  @@servediocylinderheads I dont think it was quite CVCC but 2 intakes and one exhaust and staggered intake events on the cam.

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  @servediocylinderheads17 күн бұрын

  @@oldblueaccord2629 I can see what they are doing with that. Simple design too!

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  @oldblueaccord262917 күн бұрын

  @@servediocylinderheads All those Hondas got killer gas mileage in the 70's and 80's. The CVCC head was the design Honda told Congress he could pass emissions without a catalytic converter. Thats after Ford Jr and Chrysler testified they couldnt meet the emission standards ever.

• 
  @skylinefever17 күн бұрын

  I thought the CVCC did it by having a prechamber.

• 
  @blkcoupequattro19 күн бұрын

  Running a set of Ferrea 5000 series valves in some old Ford J code small chamber heads with minimal port work other than exhaust ports opened up with nice bowel blends, and pockets opened up. I got about 160cc intakes with 65cc exhaust ports camshaft I’m running could stand a little more compression to help with air speeds, stock A code 289 Ford with flat tops pistons, I’m right at 10-1 compression with a Isky Mega 280 cam net lift is .551 at the seat….

• 
  @servediocylinderheads19 күн бұрын

  @@blkcoupequattro I bet it runs well. Thanks

• 
  @approachingtarget.450319 күн бұрын

  Hay Charles. Another live would be nice. With the hot temps outside. Record one in a comfy place.

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  @servediocylinderheads19 күн бұрын

  @@approachingtarget.4503 Not a bad idea. Thanks

• 
  @blueyhis.zarsoff114720 күн бұрын

  Why were you guys saying that DV's huge milling of the head creates issues that might not be worth it? ( shorter pushrods)

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  @servediocylinderheads20 күн бұрын

  @@blueyhis.zarsoff1147 Think about testing all the manifolds I did. Each one will need major milling to work. Not worth it and not Tony's original vision.

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  @blueyhis.zarsoff114720 күн бұрын

  @@servediocylinderheads OK yes sure. How many 2 bbl OEM manifolds are there?

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  @servediocylinderheads20 күн бұрын

  @@blueyhis.zarsoff1147 I did 3

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  @joecampisi54020 күн бұрын

  Are you part of the 318 now even of the plans changed and utg is not involved ? Hope they will test all your incredible work ! Love the 318 !

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  @servediocylinderheads20 күн бұрын

  @@joecampisi540 I offered to help with aftermarket intakes but haven't been sent any. As of right now I am done. Thanks

• 
  @arturozarate175220 күн бұрын

  ⅛" Long shank carbide burrs work great on my pencil diegrinder when I'm doing little cylinder heads. You'd be surprised at the price for an assortment of 10 on Amazon.

• 
  @servediocylinderheads20 күн бұрын

  @@arturozarate1752 Thanks

• 
  @walterFletcher-tc9bm20 күн бұрын

  Flow with valves in the guide backwards. Then at least you have the stem protrusion to provide some reality and seal the guides off. ❤

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  @servediocylinderheads20 күн бұрын

  @@walterFletcher-tc9bm Good idea. I sealed the guides with clay. Thanks

• 
  @michaely666521 күн бұрын

  Thanks for your tip to use WD40 on grinding stones with alloy, I rarely using stones on alloy heads anymore unless the spot really needs it, as it drove me mad they just clog so fast. Some scientist maybe knows why?

• 
  @servediocylinderheads21 күн бұрын

  @@michaely6665 A little wd40 helps!

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  @jamesgeorge487421 күн бұрын

  Duct tape had me confused, untill i realized what it was in the close up.. Nice work.

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  @servediocylinderheads21 күн бұрын

  @@jamesgeorge4874 Thanks

• 
  @hotrodray680221 күн бұрын

  🔔😎 YeeeeHaaaaw!!!!

• 
  @servediocylinderheads21 күн бұрын

  @@hotrodray6802 Funny!