I find myself hitting the thumbs up before the video even starts!

By far, the best explanation of degreeing camshafts. Thank you!!

@JohnSmithRacing

3 жыл бұрын

Thank you, glad you liked it. I wanted to try and explain it before I show how I do in a video. Those are next.

@guillermomaison3457

3 жыл бұрын

A trick : you can watch series at Flixzone. I've been using them for watching all kinds of movies during the lockdown.

@nehemiahimmanuel4689

3 жыл бұрын

@Guillermo Maison Definitely, I've been using Flixzone for since december myself =)

Good video that helps clear it up for people like me that don't do this on a regular basis. I am degreeing my cams right now on a 5.4. I would say usually they probably don't need degree'd due to the piston sitting so deep in the hole, but my block and heads have been decked. Block was decked alot by previous shop and i didn't go with a thicker head gasket cause i wanted extra CR. So when i first degree'd in Ex Cams were starting at 110-111 for a set of comp 106460s which have a I and E CL of 116. And i was shooting for some advance for street drivability so wanting the Ex at 119 and In at 113. I would agree that a few degrees isn't worth a ton of HP and as long as PTV isn't a concern and as long as you haven't changed the height of the cam relative to the crank by decking block or heads significantly you can snug the keys and go.

great video sir.

The math (dyno sim) shows that +/- 1 deg makes little difference but 3-5 can make a fair bit. Within a degree seems to be a reasonable build error limit.

Great video!!! I have a few questions on my 4.6 dohc build. With block zero decked ( 8 thou removed) and 2 thou off the heads with a 36 thou head gasket do you see any issues with advancing a 01 cobra intake cam 4 degrees (202 duration .393 lift)? With the cobra engineering secondary tensioner fix for the bank to bank timing descrepancy, can I just adjust the primary cam gears that came with my MMR kit and does that advance all cams or just the intakes? Looking to maximize power under 6000 rpm's. I have a ported pullied Eaton that maxes out around that rpm. Thanks!

@JohnSmithRacing

3 жыл бұрын

I don't consider myself an expert on cam profiles and the effects of advancing and retarding cams. I wish I had an engine dyno to do my own testing on a lot of theories but I don't yet haha. However, I have read that advancing the cam will shift the power curve down the rpm range and retarding it will push it further up the rpm range. The main thing would be to verify that you have good P to V clearance. You can file pretty much any cam gear to advance or retard. If you move the exhaust cam it will affect the intake but if you move the intake it will not affect the exhaust because the exhaust drives the intake cam if that makes sense. My next video will be me degree cams on a 4.6 DOHC and I will go over it in more detail.

@MikesGarageRoute66

3 жыл бұрын

@@JohnSmithRacing Thanks John!

@sSkillaz336

3 жыл бұрын

What is the secondary tensioner problem everyone is anyways talking about read about it everywhere

@MikesGarageRoute66

3 жыл бұрын

@@sSkillaz336 www.cobraengineering.net/tensioner.html

@sSkillaz336

3 жыл бұрын

@@MikesGarageRoute66 thanks i just got my cylinder heads off to do arp headstuds new custom grind cams, springs etc. Gonna be getting a new tensioner aswell now. Still haven't decided if i want to degree the cams though

I paid a shop to do it for me, TFS 185 38cc heads n MHS TFS Stage 3 cams n they said they'd degree the cams.. I'm very nervous bcuz they're not a performance shop n i guess they never modded a 4.6L 2v P71.. Do you think they'll get it degreed correctly?? They have many years of experience doing mechanic work, 0 negative reviews, but man, it takes skill n smarts to mod an engine right.. Sadly HTX doesn't want to build these big ol' boats.. Hard to find a shop..

I may need some advice.... First off, thanks for your vids! You’ve given me the confidence to take on cleaning up my cobra engine. I’ve got 98 cobra engine heads removed and will clean off carbon, replace head gaskets, timing cover gaskets and replace valve seals. My plan was to follow your vid on timing a dohc engine by the markers, but a forums is saying I need to degree my cams. I’m putting everything back to EXACTLY where it was. Only things that are replacing are gaskets and seals. Do I still need to degree my cams if I’m putting everything back the way it was and following your video on setting timing by chain and sprocket marks?

@JohnSmithRacing

3 жыл бұрын

Cool, I am glad the videos are helping you out. You do not need to degree the cams if they are stock cams. But while you are in there you won't regret putting cams and springs in haha Nothing like the sound of a cammed engine!

@wesharris1845

3 жыл бұрын

@@JohnSmithRacing thanks for responding!!! As much as I’d love to upgrade, going to have to hold for now. Completely restoring entire car myself from ground up and new cams, plus new springs, etc., would unfortunately go over budget.

@wesharris1845

3 жыл бұрын

@@JohnSmithRacing again, thanks for responding!! You’ve saved me a lot of time and unneeded stress!

@JohnSmithRacing

3 жыл бұрын

@@wesharris1845 No problem, let me know if you have questions and I will try to help.

@wesharris1845

3 жыл бұрын

@@JohnSmithRacing hey John, I’m sorry to bug you out of the blue, but wondering if you might still be able to help me. I’m refreshing seals, gaskets and header bolts on my 98 cobra engine with cleaning carbon off all the valves and heads. Valves are going back in the EXACT SAME SPOT they came out of. Visiting other forums they are saying I need to either relap the existing valves anyway or buy new valves and springs and get the heads machined. If the heads are still flat and all the valves are still sealing (I’ll be testing by putting spark plug in, flipping heads and putting water on the valve domes to check for leaks), do I still need to do all that? Also, it APPEARS that my exhaust valves had some kind of coating on them. Any problem if all my valves have been cleaned to straight metal? Sorry to throw a lot at you. Hoping to be done soon!

Hi John in you picture, the duration is that number advertised duration or @0.50 measurement? Below is what my cam specs are that I will be installing very shortly. Crower Part# 62824-4 Advertised Duration Int/Exh 258/258 Advertised Duration @ Valve Int/Exh 270/270 Duration @0.050" Lift Int/Exh 212/212 Duration @0.050" Lift at the valve 228/228 Lobe Lift Int/Exh 269/269 Gross Lift Int/Exh 484/484 0" Valve Lash Intake or Exhaust Rocker Ratio Int/Exh 1.8/1.8 LSA 114 **************************************************************** So The advertised duration@ valve = 270; Why did Crower supply that number and why is it important? I put my engine together set up the timing used just my test springs and put puddy onto of pistons. My pistons are .008 above the deck and heads machined flat was .007. It is a Teksid Block. The heads are 2004 up 9 thread. I used SCE copper gaskets measured .062 only torqued at 30Ft/lbs. MY MLS gaskets will be 0.042. The copper was just to check valve to piston clearence. Intake valves just touched pistons was the impression in puddy. They are Carrillo Bullet forged pistons with 9CC dish its a stroker so it will be close to 5.0L displacement as I am bored.020 over. Depending on my gaskets It should be 10.4:1 compression approximately as my heads are ported and chambers worked I tried measuring the CC volume but do not have very good stuff for that but should be 53cc. I had to get valve reliefs machined into my pistons. Just got my short block back for the second time. This will be in my 03 Mach 1. So what numbers do I use to degree my cams? based on your video? I am at the cross roads with this engine 6 years in the making and $20K. I want to do this myself but I am a bit nervous at this point. I have Modular Heads Wheel and Crank tool and dual dial gauges. The ford Cam installation kit. So any words of Wisdom feel free. Thanks

@JohnSmithRacing

3 жыл бұрын

I looked at their website for that part number and down in the description it has Lobe Center listed as 114 but normally for a 4V there will be two different centerlines (one for exhaust cams and one for intake). I recommend calling or emailing Crower and ask them. As far as piston to valve clearance it might not be a bad idea to check it with the dial indicator at 10 degrees before and after DTC.

@davidrudkevitch9844

3 жыл бұрын

@@JohnSmithRacing Thanks John I will call Crower.

Have you or you heard of degreeing 3v cams and deleting their VCT?

@JohnSmithRacing

3 жыл бұрын

Its not as common as degreeing the cams on a 2V and 4V but if you delete the VCT then I would think that checking the degree would be a good idea. The fundamentals would be the same as I discuss in these videos.

@angelgallo8949

3 жыл бұрын

@@JohnSmithRacing hi my builder just finished my 4.6 2v. Forged internals ported pi heads with springs and comp cams 274 my concern is i dont think builder degreed cams but he did say he set timing and he assured everything will be fine im putting boost into the motor i just wanna make sure hes telling me the truth before i pay and dyno car please any input helps

@JohnSmithRacing

3 жыл бұрын

@@angelgallo8949 Depending on what dish pistons you have and how old your chains are, you might be okay. The 274 cams were designed for the NPI heads and have a little less lift. If I remember right the 262AH is more aggressive than the 274s. If he assures you that everything will be fine then if you get piston to valve contact he should fix the damage. If the engine has already been running without P2V then it will probably not happen at WOT.

@angelgallo8949

3 жыл бұрын

@@JohnSmithRacing i have 21 cc pistons and new valves for cams n springs do u think ill be ok

@angelgallo8949

3 жыл бұрын

@@JohnSmithRacing chains and everything else brand new as well

@.-050 at 10 degrees atdc you are around .023 yes its true the valves open very fast and tdc you have dwell i hope you find this im not a troll but you should not spit this advice to pp0l looking for good advice