502 running
 

https://youtu.be/im_9GUrNGrw
Posted this video yesterday on wrong forum...so i hope my profesors will se this

Blower sounds good

Hello profesor:D.Yes blower sounds good but dit not change ballbearings inside.I guess the problem was in wrong cam timing.When i adjusted the cam and put it where it should be the horrible sound went away on it's own.

:woohoo:

https://m.youtube.com/watch?v=im_9GU...ature=youtu.be

It is your coment i was waiting for...:thankyouthankyou: Ha ha ha...But as allways a problem started..not a big one but a problem.So when i start the engine and he is cold he works ok 600-700 rpm..But when he gets hot he drops down and want's to die..Then i screw in the trotlle blade screw and ewerything is ok working great..But when it gets cold again and i start the engine he is working over 1000 rpm.So im spining in circle dont know what to do.

Good day to all of you...Can some of you tell me what should be Piston/wall clearence on my cheavy 502 with H127CP pistons(hipernautic)..Hope you all are warm and safe...thanks

Hypereutectic.

Stock 502 with forged pistons runs about .005 inch, if I recall, maybe up to .006 but not sure how that translates to using a Hypereutectic piston which is going to expand at a different rate than a forged piston.

Thank you professor for your time...I can't find anywhere how muc pistons expande.Looked all of your posts with that topic but nothing..

I'd suggest you check with your piston manufacturer to see what they recommend for clearance. I don't know enough to guess for you.

I will ask, though, why you chose hypereutectic pistons for a forced induction application? Forged would be better.

The engine came with them...But i read that some guys have them on small boost engines and work fine.When i go to summit racing page where i found som spec for the pistons it does not say how much they expand...I read some threads where people say that forged pistons exspand the least and stock pistons expande the most so i guess my are somwere in the midle

I believe You have it backwards.

Low boost in an automotive application, you could probably do ok with hypereutectics. They don't tolerate detonation at all so boost must be kept low or the tune must be kept very conservative (or carb jetting very rich). The load in a marine application is more than automotive and the margin of safety will be less.

Profesor corect me when im wrong...so it is the other way around...forged expande more then cast pistons.Yes?

So keep my boost low(6psi) and rich fuel and i should be fine.Add advance around 35 dg and keep my fingers crosed:pray: