Ok im late for work..
The only thing that i think it can be is the windage tray... The SIR rods made me have to position the windage tray physically closer to the oil pan. Do u think it was too low and so Oil just sits ontop of the windage tray not allowing the oil to fall towards the bottom as quickly so it starves the oil pump?

Anyways I now hate engine builders cuz they are retarded and dont know what they are talking about and LT1s in general for costing me so much..

 

Same cylinder ar different one this time?

 

Sorry to hear that. I know I am constantly watching my oil pressure after my engine went to hell with only 7 grand on the clock. It's kinda like the chicken and the egg: which went first, the oil pressure or the bearings.

When someone else messes with your engine, you really have to be aware of everything they did, because they are not going to admit doing anything that could cause the failure. And once the "event" occurs, I believe it is rare for the victim to call in CSI --never really knowing what happended and why.

Since this is your 2nd, I would take that block to someone else since I doubt that you are going to get any satisfaction from the builders and have them investigate the situation with you by their side. JMHO

 

Also unless you know your oil system like the back of your hand a motor is not going to live forever.

Checking, knowing and setting every clearance in the motor is how you get them to live. This shouldn't have happened in your motor if these specs were all correct.

Bret

 

Do you have a stock size oil pan? Normal or high volume oil pump?

 

Stock brand new oil pump and pick up.
Stock pan
Windage tray lowered about 1/2 inch to clear rod bolts
Stock oil pump spring
I use to have a high pressure spring in it the 1st time i spun a bearing..

I swear if i didnt love that car so much and if it didnt have sentimental value to me I'd light it on fire... Every single time i take it out and stop somewhere, be it gas, or my garage, or a friends house it gets compliments. Its such a f*cking great overall super car if it'd just f*cking not spin a bearing...

Im taking the engine somewhere else and having them check it out.. I dont think i damaged anything.. STill early stage of spun bearing..
I might just through the stock crank and rods back in and sell the aftermarket ones since i really have no freaking clue whats going on.....
This event has cost me the ability to buy my investment property and is keeping me from Gigging Live at clubs.... Im so ticked off.

 

Spun a bearing twice Who built them? If I paid to have a motor built and somthing like that happened twice I would take it to a reputable engine builder have them document and take pictures of everything while they take it apart because if it turns out to be something they did maybe they would give you your money back and if they don't. Sue them for being stupid. Also how many miles did you put on each one before they spun?

 

How many miles were on the motor? What oil were you using?

 

500 miles the first time.. I changed the oil 2 times during that period.. 2nd time was at 500 miles.

This time 1200 miles changed it Once after 100 miles and it was fine... Checked it at 500 it was fine...

Regular Mobile 1 Dino oil was used.

Could be what ever tolerances they were using on the bearings were too tight and at high rpms the oil couldnt push through and killed them.

 

what kind of oil pressure did u have and what weight oil did u use?

 

At least you didnt do like i did and lose a rod and trash your whole engine...well except for the intake. I was also thinking that your clearances may have been too tight.

 

10w30. oil pressure was 65-70psi at start up and 19psi at idle after warm up. As it should..

When i noticed the problem again start up pressure dropped to 50psi and a few times oil pressure dropped to around 11psi at idle... .. But mostly stayed at 19psi.

 

65-70psi is too high... your bearing clearances were too tight

Bret

 

Your oil preassure was to high the people or person that built your engine is at fault its common sense, bearings after a rebuild I would be pissed off. And you were not even thru breaking the engine in....

 

Agree



Ya don't need 50-60psi unless ya are running 2.5-3.0 clearances on the brgs. 25-30 at idle and 40-45 at cruise