dan10101

I recently purchased a914 with a built LS6 engine - forged bottom end, balanced and blueprinted, trick flow 215 heads, Not sure how to calculate the cam it’s a Custom Comp .544/.534 lift 220/224 duration at .050. However it has 1.8 rockers so I’m not sure the proper way to calculate the true lift and duration.

1) Noisy engine – Sounds like lifters, but they have been looked at several times. It has had problems with pulled rocker studs. The most recent repair installed T&D 1.8 ratio shaft mount rocker kit, upgraded valve springs, pushrods, Viton valve seals

2) Oil analysis says high lead (162) and high copper (72)

I’m old school and new to the LS engine especially built aluminum block engines. It does have forged pistons and headers so I expect some of the noise to be coming from that. I haven’t had much driving time as the body is wrecked and in the process of being repaired. In the meantime I’m trying to find out why the engine is so noisy.

I did fabricate a head shield out that would block off the engine from the headers down and it made it considerably quieter.

I guess my real question are:

Are engines of this type noisy?

Does the oil analysis indicate a problem? Could it still be breaking in?

Thanks in advance.

Dan

HappySalesman

iTrader: (3)

Only place you'll find copper and lead are in bearings. Have a video? Also, whats your oil pressure sitting at?

G Atsma

I calculated your lifts with the 1.8 rockers at .576 intake, .565 exhaust. Good numbers!

dan10101

I'm uploading this video, it should be ready shortly
Bearings are concerning, I think they were done recently. Maybe residual? If I'm right it was done in the car...
Oil pressure was good. Somewhere around 40. I'll look later to confirm.

dan10101

Thanks! Do you know if the duration change with the added lift?

G Atsma

There is a slight increase in duration due to the higher rate of lift, but I have no way of calculating that.

miami993c297

iTrader: (6)

That lead is a warning on a stock bottom end LS6...and copper is still in range fro a LS6 that is driven hard...but NOT the lead.
Christian

tech@WS6store

iTrader: (2)

Someone must have assembled that from a JC Whitney catalog because its all sorts of wrong.

Id expect at least bearings as an issue. Dont continue running it unless you check the bearings and the cam timing/pistons.

dan10101

I have to agree. With my limited knowledge of LS engines, I've never heard one so noisy.
It was initially assembled with the best parts. And the most recent work was done by J&M Corvette in NJ. I couldn't find a working number and it's been several years.

HappySalesman

iTrader: (3)

I'm with the WS6Store... bearings at a minimum. Honestly I'd pull the motor and tear it down, check everything, then put it back together. That way you know it was done right.

dan10101

It will have to wait until I get the body work done. It's on a chassis jig and the engine won't come out as it is.

A.R. Shale Targa

iTrader: (2)

dan10101

Thank you AR. This is kinda what I was expecting to hear. I'm sure this is what the previous owner was told.
I'm at the point now that I will at least pull the pan and check the bearings. Look for abnormal wear, (I've hear bad things about the thrust bearing). The last guy who did the bearing job years ago, (but few miles) did pay close attention to the oil pickup tube and O ring when he reassembled it. The lead count is most concerning to me, but I'm still wondering if maybe it's leftover residual from previous bearing problem.

G Atsma

That's not Tony Mamo. He just made the quote at the bottom of A.R. Shale Targa's posts.

dan10101

Thanks G.

dan10101

Christian, thanks. I did see that copper levels are often high in a normal engine.
I'm wondering if the High Lead was caused when the bearings were replaced. The engine has an oil cooler and I'm wondering if some of the lead particles were left over from the previous bearing problem whatever that might have been.
That job was done in car which leads me to suspect the clean up wasn't as good as it could have been.