Leak down testing!
Thread Starter
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,443
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Leak down testing!
I have about 14,000 miles on my solid roller motor and I've noticed that every few tanks of gas that it needs another quart of oil. So I hooked up the leak down tester. I suspected that my 1/16th racing piston rings were probably warn out.
But all my cylinders are 2.5 to 3 % which is like a freshly rebuilt motor. So the problem of oil usage is bad guides again in the AFR 210 heads. My high lift solid rollers kinda go through guides. .664/.688 lift right now.
But all my cylinders are 2.5 to 3 % which is like a freshly rebuilt motor. So the problem of oil usage is bad guides again in the AFR 210 heads. My high lift solid rollers kinda go through guides. .664/.688 lift right now.
Thread Starter
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,443
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I have never followed my Vette to see. I do get blue smoke on start up if it has sat for days. The AFR heads are modded for better oil return, but I don't think that I did enough. Even with Teflon PC seals it seems to get in.
As to oil weight I use a combination of VR1 10W-30 and 20w-50 to get the correct oil pressure while hot.
K&N valve cover vented breathers
As to oil weight I use a combination of VR1 10W-30 and 20w-50 to get the correct oil pressure while hot.
K&N valve cover vented breathers
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,170
From: Hermosa
Given you get smoke on start up I think I would be pulling some springs and checking for valve guide wear.
On my dart headed 350 I did have some issues with the spring snagging the guide seal and unseating them, that could be an issue as well perhaps.
On my dart headed 350 I did have some issues with the spring snagging the guide seal and unseating them, that could be an issue as well perhaps.
