New Engine Leak Down Numbers
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,738
Likes: 53
From: Bogart GA
New Engine Leak Down Numbers
Well, its been awhile and I thought it was time for an update. Been traveling a lot for work so the engine still sits in my garage. Making some progress but it has been slow. I though that it may be a good idea to check the leak-down rates and after it is installed, do a compression test to establish base line values. The values I obtained were not great but were performed on a cold un-broken in engine. I really have no idea how much time the engine spent on the dyno before the final run....my guess is not much time at all. Most of the leakage is past the rings and piston #1 and 8 have a very small amount past the exhaust valves. Was thinking about spraying them down with WD40 and blowing them off with compressed air but they are quite clean. May be a little carbon on the seat from sitting so long. I think I will also go ahead and check the valve lash while I am at it. I want to know as much as I can about the engine before I drop it in the car.
Cyl
#1 17.5%
#8 12.5%
#4 8.8%
#3 12.5%
#6 6.25%
#5 8.8%
#7 12.5%
#2 10.0%
I used an leak-down tester from OTC using 80 psi for my reference pressure. Cylinder #1 is the outlier. There always has to be one..
Cyl
#1 17.5%
#8 12.5%
#4 8.8%
#3 12.5%
#6 6.25%
#5 8.8%
#7 12.5%
#2 10.0%
I used an leak-down tester from OTC using 80 psi for my reference pressure. Cylinder #1 is the outlier. There always has to be one..
