Leakdown
 

What are reasonable cylinder leakdown percentages for a well sealed stocker engine?

Thanks,
BIll H

Re: Leakdown
 

I'd say 6-8%, that's what we see, when we have decent power and no oil or smoke out of the breathers. I'm going to start using a blow by meter on the dyno.

Re: Leakdown
 

well sealed 2-4%
my was 2%
vic guilmino
1129 stk
1460 ss

Re: Leakdown
 

Vic

Are you using a 2 gauge tester? There seems to be a big difference
between single and dual gauge testers on the same engine.
Just curious if anyone else has run into this

Re: Leakdown
 

Thanks. I just ran my old motor with a two gauge tester. Quite a variation, best was 2%, worst was 8%. I can hear the air from the valve cover breather, while the headers and carb are quiet, so I guess it is ring seal that is responsible for the variation.

Hey Vic,

Did you tell me that Billy Nees did your headers? I imagine that he needs the car to build them?

Thanks,
Bill H.

Re: Leakdown
 

i used a one gauge
yes billy needs the car
i can give you my headers and have him build me a new set same size and all
how many runs on engine
8% my car is dead