RsSean

iTrader: (27)

Ok well i started to ride around on my mickey thompson ET street around town. Normally the oil pressure will fall over to shy of 80 psi at 6k rpms. But under hard acceleration in first and second it will fall back to around 40 psi. I am thinking that the oil is being slammed to the back of the pan starving the pick to a little extent. Because no pressure issue in 3rd or 4th. If you lightly accelerate in 1st and 2nd the problem is not there. Is anyone else having this issue. If so what are you doing to correct it?

2000 LS1

Thanks

01ssreda4

iTrader: (96)

Have you tried maybe running 1/2 to 1 quart over?? Thinking this may help....

dug

iTrader: (10)

it did something similar on my old camaro. I always thought the oil was accumulating under the valvecover not draining to the oil pan fast enough.

When the oil was fresh it was never an issue. But as it got older and dirtier the oil pressure would drop as u described.

RsSean

iTrader: (27)

Have not tried this yet but another person that I have talked to has siad to do the same thing.


Recently changed/

butler

When I built my 383 I took the oil pump pickup cut it and extended it to the back of the pan. I had to modify the bottom of the pan but no more problem. I also drilled four small holes in each lifter tray to drain the oil out faster.

01ssreda4

iTrader: (96)

Drilling holes in the lifter trays does absolutely nothing. Here's why, when you drill the hole, the oil fills to that point then starts dumping out of the hole as the level tries to increase over the hole. If there is no hole then the oil will fill the whole lifter cup, then as the level reaches the top of the cup, it will overflow out the top. I mean the cup can only be so full. Drilling holes in the cups doesnt help it drain any quicker obviously draining through 8 holes isnt quicker then 8 cups overflowing is it? It would start the drain process a tiny bit sooner, but really that would be determined by how full the lifter cup stays during normal operation.

LS1-450

iTrader: (33)

Not to start another huge debate, but, there is @ least one thread on here where guys had been debating the point, "internet myth....etc.," when a professional engine builder jumped in & made this statement. It roughly said, "before I started drilling the lifter cups, we were re-building one engine per road race, (road course), after drilling cups, the engines would last for three races before requiring a re-build."

dug

iTrader: (10)

ok, I dont have anything else to add other than I used the longer truck oil filter which holds more oil. That might help a lil bit if youre not already using one.

Im still curious as to whats going on and how to fix it besides running an extra quart of oil

71novaguy

iTrader: (2)

deep sump

koolrayz

iTrader: (26)

Moroso Oil Pan or a dry sump.
I bought the moroso but changed my mind and am going to a dry sump.

TJ

iTrader: (10)

on a pretty much bolt on and cam car?
there is an issue somewhere.
stock parts should be adequate for his setup.

01ssreda4

iTrader: (96)

Well whether thats 100% true or not who actually knows. I remember reading that thread myself. That was and still is a "special" case of a race only motor. This thread does not pertain to a race only motor. Knowing the function of a motor I tried to describe it in very basic terms, as some people seem to go way overboard overthinking things. Its very simple in my mind. The level of oil will build up until gravity wins. Holes or overflowing cups, either one will yield the same results: oil return downwards to the oil pump pick up. Im not asking anyone to believe or not believe. Just think about I'm saying. If you are unsure or have never seen lifter cups, then get an old plastc cup in your kitchen. Run the tap until it gets full and overflows. Then drill a hole in it and try it again. The water will only hit the sink as fast as its coming out of the tap. And if the hole isnt big enough it will eventually make its way to the top and spill over anyway. Lifter cups aren't rocket science. I try to make it understandable so people can see how it workd rather then just take someone's word.

LS1-450

iTrader: (33)

^^^Yah, I get it; was just throwing it out there. I've got a bucket full of lifter cups & a few blocks. Was noting it as both additional general information.

SIC LSX

iTrader: (10)

Im with him/TJ because he has a stock pump with way way more power and pulls 1.3 60ft's and run 9's on motor and has no problems with his oil pump. also these stock oil sending units and gauges suck and are not accurate at all.

sounds like a pump or an o ring issue with his cam install? what oil are you running

dug

iTrader: (10)

A long time ago I read an article in SAE about the corvette ls1 engine. In the article they mentioned that at high rpms oil would accumulate in the topend of the motor, which lower the level of oil in the oilpan. I think this also contributes to the oil consumption issues with the pcv.

Darkman

iTrader: (2)

One option is the poor man's dry sump - an Accusump.

ae13291

iTrader: (8)

add more oil

TJ

iTrader: (10)

"ive got 2 gallons in it already."

daniel6718

iTrader: (36)

more oil...

outkast6991

iTrader: (34)

as far as drilling the cups goes i'm not reallly sure what 01ssreda4 is saying. you can't believe that 8 little cups holding oil on the top of the motor does nothing to the level in the pan itself. if you have the holes in the cups common sense says you will have slightly more oil in the pan. am i missing something?