Lifter problem

[fizz]

Finally got my car together and started up. It has a hydraulic roller cam. It had made a little clatter when it was on the engine dyno, but came out of it as it made pulls. As we were running engine in the car checking everything over we noticed some clatter on the right side, same side as the clatter when it was on the dyno, so pulled the valve covers to adjust valves and found one lifter was bad. I have a replacement coming, but is there anything else I should be looking for. They are comp lifters. I have never had a bad lifter on a new build before, it concerns me.

[Challenger340]

Finally got my car together and started up. It has a hydraulic roller cam. It had made a little clatter when it was on the engine dyno, but came out of it as it made pulls. As we were running engine in the car checking everything over we noticed some clatter on the right side, same side as the clatter when it was on the dyno, so pulled the valve covers to adjust valves and found one lifter was bad. I have a replacement coming, but is there anything else I should be looking for. They are comp lifters. I have never had a bad lifter on a new build before, it concerns me.

Did you dis-assemble the Lifter to locate the source of the "hydraulic" failure within it ? that caused it not to maintain preload and "clatter" ?

Where(what rpm) did peak power occur on the Engine Dyno ? , once the "clatter" went away as rpm came up ?
And if you don't mind sharing.... Which HR Cam did you use ? (grind specs)

[BSB67]

I have never had a bad lifter on a new build before, it concerns me.

I have no words of help or advice, and I too would be concerned.  I believe that it is simply a reflection of the quality of todays aftermarket parts.  I too would probably take apart the problem lifter to see if you can determine root cause.  In the end, I think that you are stuck with replacing the problem lifter(s)

What weight oil are you using and what is your oil pressure at idle and cruise rpm?

[John_Kunkel]

so pulled the valve covers to adjust valves and found one lifter was bad.

"Bad" in what way? Disc collapsed under pressure?

Most times, simply disassembling the lifter and thoroughly cleaning it will save it. Tiny debris in the check valve will prevent it from seating.

[fizz]

It is HR-256/372-2S-10 crane cam. Max rpm on the dyno was 5800. When adjusting valves the valve would collapse. I' will take the lifter apart and look at it. Different cam/lifter manufacturer because crane sent cam, but out of stock for lifters, according to engine builder. I believe the cam is a custom grind. I will post cam card tomorrow, if it helps. Thanks

[fizz]

PRW stainless rocker arm assembly. That stuff OK?

[fizz]

Oil pressure hangs in there at about 75 #. Don't have good analysis of oil pressue range yet as I have so little run time. Oil pressure on Dyno ranged only 2# 3600-5800 rpm range. Only engine dyno time and first start up in car so far. Peak power(575) was at 5700