MeMz

Recently put my motor back together after fixing a bad lifter and replacing the cam.

Was getting the motor up to temp when it siezed, taking it all apart again now and it looks like it spun some bearings on the connecting rods, checking the main caps tonight.

My question is, would modifying the Base pan with a -4 an feed line out of the top of the filter caused an insufficient supply to the rest of the rotating assembly? Was a restrictor needed?

From what I've taken apart so far it's unclear what the cause of failure was, I guess common sense would say that it was oil pump failure, but how can I be sure?

Thanks in advance!!

dburt86

iTrader: (2)

most likely not your cause. Id be willing to bet it was whatever metal was in there from the lifter or something along those lines.

You hardly need any pressure are idle to avoid damage. For you to spin multiples, it either had no oil or they were already Effed in the A

MeMz

Hmmm, I didn't have any metals in the magnet on the oil pan when I initially dropped the pan when I fixed the lifters. Its strange... I've actually only removed one connecting rod bearing too and came across the carnage, so I'm not even sure how extensive the damage is.

drecpt83

Oil pump?? Sounds like you were already possibly having oil delivery issues. When you replaced your cam, how did the cam bearings look?

stevieturbo

No...but that depends on exactly what you've modified !

MeMz

Modified wouldn't be a good word, my apologies.

All we did was drill and tap 1/8" for a -4 an feed line to the turbo and drilled and tapped in a -10an drain

stevieturbo

Yes but exactly where, on what oil pan etc etc ? What fittings, how deep did you drill ?

There are a ton of variables, be specific, pictures etc always helps.

What one person might describe...could be vastly different from reality !

sbcgenII

iTrader: (1)

What was the oil pressure?

MeMz

I don't remember what the oil pressure was when the engine failed because I was running back and forth between filling up the radiator. But it had normal operating pressure (according to the gauge cluster) when it ran several times before failure.

The feed was drilled and tapped at the top of the oil filter on a stock ls1 oil pan.

MeMz

I'm already assuming that it was oil pump failure, my main question was really if re-routing oil flow for a turbo could be a suspect. I feel like I've read so many threads about people doing the same thing, and no issues were there.

My buddy helping me is really the one asking the questions because he doesn't wanna hear it from me when I tell him I already copied someone else....

sbcgenII

iTrader: (1)

Tapping that hole won't hurt anything unless your motor was already dangerously low on volume. If you had good pressure at idle than I doubt pressure relief wasn't stuck open. If you had good pressure I doubt your bearing failure was related to anything doing with the pump.

pdxmotorhead

Did the drain get tapped in at a known safe spot? I had a friend nick a oil passage on a block skirt install so it was losing oil back to the pan and dropping the pressure after the gage...(Different motor but thought I'd ask.. May not even be possible in your setup.. )

sbcgenII

iTrader: (1)

There is a fitting above the oil filter that you can take off and tap and get filtered oil. It sounds like he took it off and tapped it so that wouldn't be the issue here.