$10,000 Valvetrain...Don't crash it!!!

[@ComputerCapone]

I hope most of the people realize the wealth of knowledge being given here. And i surely hope they realize how lucky we are to have such an articulate person explaining this so gracefully and purposefully. Happy to have virtually met you Mr. Strader.

[@MrRangerZr1]

Funny I started watching your videos yesterday and now you uploaded (after a while) keep the videos coming

[@davidciesielski8251]

Thank you!!!! That was an eye and mind opening couple of minutes..... I heard this kind of thing changed prostock drag racing quite a bit....BMEP was way far off ....spintron to the rescue (The valve was no where near where they though) Thanks

[@shadowsinner1356]

Why is it just before top dead center instead of afterwards

[@EFIU_Ben]

Actually it IS both sides! The exhaust is closer Before TDC and the Intake is closer AFTER TDC...sorry for the confusion!

[@randallsemrau6911]

Can you simulate a forced induction situation?

[@ercost60]

Cool & scary negative static clearance! Of course, camshafts twist, timing gears flex, and heat expands parts. So much to consider. Mind blown. WANT Spintron FTW!

[@gordowg1wg145]

i was aware of the problem of deflection in push rod/rocker arm equiped engines, I hadn't realised it was this significant, even with the very high lifts and spring rates used. This would also seem to be a contributing factor to the issue of loft as some of the components 'spring' back? There would also seem to be a potential problem if one, or more, components are swapped out as their stiffness and inherent spring rates may vary and, if they should get into sync', could be a big problem. Any particular reason for using billet alloy for the intake and what appears to be investment cast for the exhaust?

[@shoominati23]

I like looking at pulled apart Stock Eliminator or Super Stock engines to find all the tuning tricks.. They have to stick with parts like factory cylinder heads etc, so they have to optimize everything inside the engine to gain every little drop of power - things like crazy pistons with Dykes rings and extra venturis inside the intake manifold to create kind of a helmholtz resonator to draw more mixture in etc etc .. I saw a 66 Nova with a 283 in Super Stock that could point the front end toward the sky at will, you can easily spend $30k+ on a smallblock in classes like that..

[@neelsvanniekerk1807]

I assume this only covers the inlet valve as the "lag" on the exhaust valve closing side is what gives a lot of issues at high rpm?

[@EFIU_Ben]

Yes, we also look at the exhaust side as well using the same methods.

[@neelsvanniekerk1807]

@@EFIU_Ben I never doubted that but it will require the opposite - a bigger clearance than static.

[@EFIU_Ben]

Yes! You are correct!

[@turbotoaster1984]

Enjoyed watching that Ben and to see the deflection in action, also listening to Ben squared is fun. There was one question I wanted to ask, when looking at p2v, would you say on a high end engine that your looking at a percentage of valve size and lift to work out clearance. For example a 1" lift on a 2.2" sized valve in a v8 verses a 0.5" lift on a 1.3" valve on an import twin cam such as your favourite k20. You see recommended clearances thrown around but mostly that's for V8 engines and I wondered if you would look at this differently on smaller engines(I know a twin cam such as a 2jz doesn't have pushrods and rockers to deflect etc)

[@EFIU_Ben]

Well, I don’t know if an easy rule of thumb formula for that scenario, but with an overhead cam system you have two things working for you...1) there is far less deflection due to the lack of rockers and pushrods, and 2) the smaller valve masses require far less spring to control because the total force is much lower. So while PtoV is still always a problem to solve it is much easier with smaller valves!

[@shadowsinner1356]

I would recommend to put pictures into the editing to show people who don’t know what things look like

[@EFIU_Ben]

Thanks!

[@darylmorse]

Very interesting. Thanks for sharing.

[@natez0690]

So with static negative P-V, if one of your dual or triple springs break, you get P-V contact? Talk about an interference engine! Wow!

[@Tamang2-c8x]

I want to learn efi systems

[@ComputerCapone]

"Do i have a head here?" pulls out a piece of jewelry. lmao.

[@stevehammel2939]

I don't understand why pushrod engines are still being built for racing instead of DOHC'S using cam buckets which gets rid of all the valve train flexing and weight...even better would be solenoid actuated valve timing

[@randallsemrau6911]

In NASCAR at least, they were outlawed.

[@rotorhead5826]

DOHC engines definitely have certain performance advantages, however more cams, valves, and springs ran at their limit put greater stress on the chains, guides and sprockets, or belt and related hardware. Since NASCAR and NHRA top fuel have relegated themselves to pushrod style valve trains, they have been developed so far to the point where it doesn't even make sense to change the rules to allow DOHC.

[@jonjon3211]

Genius