lifter help
#1
Registered
Thread Starter
Join Date: Nov 2008
Posts: 171
Likes: 0
Received 0 Likes
on
0 Posts
lifter help
so i have a gen 5 502 that I upgraded to a roller cam. I had a problem with my crower retro-fit hyd. roller lifters. 4 of them were collasped. I had Bob madera make me a custom cam and went with the crower lifters because i already had them. Well anyways, when I found out they were bad I called Bob back and got some Morel/PBM lifters #931 that he recommended. The PBM lifters were longer so I had to get new pushrods, no big deal. Well the problem is, with the crowers that were bad I had 80psi cold oil pressure and 50psi hot. After swapping in the new lifters I have 40psi cold oil pressure and 20 psi hot throughout all the rpms. So my question is what gives? anybody have this problem. Im stumped. I put on a mechanical gauge and the pressure reads the same as my electric gauge. So again, can anybody help. Thanks
#2
Registered
cq,
I have used the 931's on a couple of 502's and have not had any issues. I have a set at the shop I am getting ready to put in a 396 engine for a car. Only thing I can think of is if your new cam is ground on a smaller base circle or something unusual and is letting the oil hole of the lifter either come out of the bottom or the top of the lifter bore ? I will try to remember to look at the ones I have on Monday.
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
I have used the 931's on a couple of 502's and have not had any issues. I have a set at the shop I am getting ready to put in a 396 engine for a car. Only thing I can think of is if your new cam is ground on a smaller base circle or something unusual and is letting the oil hole of the lifter either come out of the bottom or the top of the lifter bore ? I will try to remember to look at the ones I have on Monday.
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
#4
Registered
cq,
Just looked ata the RL931's that I have here at the shop and compared them to a set of Cranes. I do not see any reason that they should be causing an oil pressure problem. I also verified that they were the lifters we have used several times on 502's with cams in the .625" lift range.
Any possibility that something else is causing the problam ?
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
Just looked ata the RL931's that I have here at the shop and compared them to a set of Cranes. I do not see any reason that they should be causing an oil pressure problem. I also verified that they were the lifters we have used several times on 502's with cams in the .625" lift range.
Any possibility that something else is causing the problam ?
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
#6
Registered
I'm using Morel Lifters from Bob, no problems at all with oil pressure. Call Bob and talk to him on this, if you stump him then use this forum. I've found out that if you go to Bob first you will save yourself a lot of time and headaches! JMHO
#7
Registered
Thread Starter
Join Date: Nov 2008
Posts: 171
Likes: 0
Received 0 Likes
on
0 Posts
well i talked to bob and he thinks the lifter might be coming out of the lifter bore. He said he had this problem one time on "artic's" motor due to having a chamfer on the lifter bore. I noticed when I put the lifters in the bore, it had a chamber at the top of the bore. This is a stock GM block gen 5 non roller block. Is this normal for non roller gen 5 blocks? I believe factory roller motors have a squared off lifter bore. Any help would be great. If artic could respond with his experience that would also help. Thanks
#10
Registered
Thread Starter
Join Date: Nov 2008
Posts: 171
Likes: 0
Received 0 Likes
on
0 Posts
so i talked to bob today and he said I should share my problem. Well I changed the fram oil filter to a new fram oil filter and now I am back to normal oil pressure of 80psi on the garden hose. Im going to the lake on thursday and I'll update you if I have any problems.