RockinWs6

Well that's a good question, it seems there maybe two different noises going on. Piston noise in the back ground and lifter noise. I noticed today when I start it I can hear the slight knocking at idle but as I raise the rpms to 1000 something starts tapping clacking rattling like hell. By 1800 rpm the engine gets quiet again and you only hear the rocking -knocking piston noise, Really a hand full to diagnose.

I'm taking it to a very well known LS1 shop tomorrow and see what they say. The car runs fantastic and above 2k sounds fine. My wife thinks I just worry too much....LOL.

03Sssnake

iTrader: (20)

I'd agree...start here, pull the valve covers and see if you have any loose rockers on the valves that are closed, roll the motor over slowly and check the valve play and other rockers as valves close(remove spark plugs to do this)...

03Sssnake

iTrader: (20)

I'd trust my gut, you have had LS cars before... maybe you are worrying too much, but better safe than sorry.

RockinWs6

We've had 5 but I've never heard this much noise before. Strange thing is this one runs the best out of all of them. It doesn't seem to use any oil either and the oil stays nice and clean after you change it. Just a very noisy running engine, I noticed if I stand on it hard and get the rpms up high and back off the throttle a bit its much noisier than any of the others we have owned. But it runs fantatsic, I guess loose is QUICK. Only has like 42k miles on the car.

RockinWs6

Update:

O-RING on the pickup tube causing all this craziness.........bearings are fine.....lifters full of air are the source of the clattering at 1000 rpm.

flattusmaximus78

iTrader: (1)

My stock engine ls1 clacked extremely hard on a cold start until the temp gauge, not oil pressure, went to the quarter mark.

My 4 cylinder s10 does the same thing.

My oil pressure gauge lags, but it doesn't start at 40 and build pressure. Cold it's close to 80 and 40 at hot hot idle.

My built engine makes the same noise as my stock one on cold starts. I'd be scared if it didn't.

As far as shaky needles, my stock opsu did it in the camaro. I ripped it on accident during my build, new one doesn't do it, old one did though. My s10 does it. No worries.