Leakdown

Bill Harris · 07-02-2007, 10:53 AM

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

Thanks,
BIll H

Alan Roehrich · 07-02-2007, 09:33 PM

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.

vic guilmino · 07-02-2007, 11:10 PM

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

Kevin Love · 07-02-2007, 11:58 PM

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

Bill Harris · 07-03-2007, 04:50 PM

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.

vic guilmino · 07-04-2007, 09:14 PM

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

07-02-2007, 10:53 AM	#1
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	Leakdown What are reasonable cylinder leakdown percentages for a well sealed stocker engine? Thanks, BIll H

07-02-2007, 09:33 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,087 Likes: 1,532 Liked 1,737 Times in 395 Posts	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. __________________ Alan Roehrich 212A G/S

07-02-2007, 11:10 PM	#3
vic guilmino Senior Member Join Date: Dec 2001 Location: wv Posts: 883 Likes: 42 Liked 56 Times in 21 Posts	Re: Leakdown well sealed 2-4% my was 2% vic guilmino 1129 stk 1460 ss

07-02-2007, 11:58 PM	#4
Kevin Love Member Join Date: Jan 2002 Location: canada Posts: 113 Likes: 5 Liked 19 Times in 10 Posts	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 __________________ Kevin Love 5666 STK/SS

07-03-2007, 04:50 PM	#5
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	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.

07-04-2007, 09:14 PM	#6
vic guilmino Senior Member Join Date: Dec 2001 Location: wv Posts: 883 Likes: 42 Liked 56 Times in 21 Posts	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