Many collapsed lifters -- how does this happen?
Thread Starter
TECH Enthusiast
Joined: Apr 2002
Posts: 588
Likes: 0
From: SC
Many collapsed lifters -- how does this happen? Seems as if you can move by hand 5 of my 8 rocker rollers. Im told this means that I have collapsed lifters. These are comp r lifters, which I thought were pretty resistant to this type of problem.
The car's power seems to takes a dive in the upper rpm band, you can really feel it tail off, but I think I must have dynoed with at least some of these lifters already collapsed and still produced really good numbers. Why wouldnt this have shown up on the dyno? At the track the car runs like crap.
I am also told that this can be partially if not totally to blame for the oil coming back up through the intake into the airbox problem I had the last time I was at the track, which only happens at high rpm.
I read another post saying these lifters are sensative to preload, but I think we were fine for preload. Running yella terras, valveltrain pretty quiet, and I believe 7.35 pushrods. Also my leakdown test came out fine for all 8 cylenders (well under 10% each @ 100 psi)
Looking for insight or thoughts on this situation.
PS Aiden your PMs are full if you see this post.
The car's power seems to takes a dive in the upper rpm band, you can really feel it tail off, but I think I must have dynoed with at least some of these lifters already collapsed and still produced really good numbers. Why wouldnt this have shown up on the dyno? At the track the car runs like crap.
I am also told that this can be partially if not totally to blame for the oil coming back up through the intake into the airbox problem I had the last time I was at the track, which only happens at high rpm.
I read another post saying these lifters are sensative to preload, but I think we were fine for preload. Running yella terras, valveltrain pretty quiet, and I believe 7.35 pushrods. Also my leakdown test came out fine for all 8 cylenders (well under 10% each @ 100 psi)
Looking for insight or thoughts on this situation.
PS Aiden your PMs are full if you see this post.
