01ssreda4

iTrader: (96)

You're right and still dont see it. If the holes are there the cups hold less oil. Correct. It doesnt effect how quick the oil drains back to the pan bc the cups will overflow when they get full. If you run a half a quart or whatever more oil total, that will account for the oil trapped in the cups during operation. I was simply illustrating oil drainback, nothing more, nothing less. I was trying to shed some light on the "drill holes in the lifter cup suggestion"

butler

Really? You drill 4 holes in each lifter tray and it will basically drain little or no oil. Man you must be a teacher not an engine builder. Just like removing the casting flask at the oil ports in my oil pan at my oil filter. One port was halfway covered up. Maybe I shouldn't have cleaned it up. Or extending the oil oump pickup tube to the back of the pan to eliminate oil starvation under extreme or even decent acceleration. Stock is the best from what you preach.

butler

They won't get filled up if there are holes drilled in them

01ssreda4

iTrader: (96)

One sentence of this applies to me and the rest you pulled out of your *** and has no bearing on this thread or anything I said. If you comphrehend the English language go back and reread what I wrote and then slap yourself.

Good day

01ssreda4

iTrader: (96)

And once they get full by not having holes they overflow accomplishing the same thing : oil drainback. You musta been in the slow classes in school.

butler

At 53 years of age I doubt that. Just another smart *** that knows only what he reads.

butler

If the holes are too small I can somewhat agree but the oil draining back is not like holding a plastic cup under a pouring faucet. If that much oil was on top of the motor you would need 10 quarts in the oil pan.

butler

I am so impressed yoda. Woo what are you white collar too.

01ssreda4

iTrader: (96)

If you are refering to my occupation, its on my profile page. Feel free to look at it.

butler

The man had an issue and I said what I did to eliminate the problem. You don't think it works fine. I don't agree with the logic you used.

01ssreda4

iTrader: (96)

You really dont get it do you??? Its a cup, and for some a cup with a hole. What you believe doesnt change the laws of physics. Whether the oil drains through a hole or over the top of the cup it doesnt change ****. It will start to drainback a little sooner with drilled holes, yes I agree. But a motor turns thousands of rpms a minute. So the lifter cups fill up and hold oil, to the hole or to the top, minus that amount from the total internal volume and then you have a new figure, active circulating volume. A predicted figure noted from the known stationary volume of oil in the lifter cups at a given time. Oil system will still function the same just with slightly more or slightly less in the cups at a given time. Doesnt change oil drainback as a whole. And thats what we are discussing in the thread.

butler

No it's a discussion of lost oil pressure on acceleration. Oil starvation. Yes you can put more oil in the pan but then the oil turns into suds from the crank acting like an egg beater. Oil areation. Imo gm missed it on this one even if you can spin the cam and remove it without removing the heads to pull the lifters. Getting the oil back in the pan as quickly as possible is vital and if drilling 16 holes helps it I will do it.

dug

iTrader: (10)

does anyone have any pics of the cups so i can understand what the argument is about? I tend to side with butler. Improving oil drainback should solve the problem and adding oil will increase problems with windage, where the rotating asm spins through the oil. not good.

I having taken one of these engines apart and visually see whats going on so i dont know. But again getting rid of casting flash is always a good thing

01ssreda4

iTrader: (96)

^^^ first let me say that from the horse's mouth he said if the cup fills up you have way to much oil in the top of your motor. So if the heads arent dumping oil into the cup then the hole in the cup does no good either. Plus, the cups sit at an angle, they dont even have to be 90% full before the spill over. Also, if you are argueing with butler and he says the lifter cups retain oil during operation then duh running oil a quart over wont matter bc its stuck in the lifter cups. I wish some people could form one complete concise thought.

BTW, there are holes in the bottom of each cup, with a pushrod going through the center where it rests on top of the lifter. The "bottom" of the cup is loosely sealed to lifter. The cup has slots to keep the lifter from rotating. They are what holds lifters up when people do the roulette method during cam swaps.

Joshiedoom

iTrader: (4)

Im with this guy

01ssreda4

iTrader: (96)

OP, im sorry to have to go back two pages and quote you here. But let me offer you a sound piece of advice from experience. I had a similar issue to yours. Long story short I found .040 endplay in the crank and the thrust bearing and surface trashed. Want my honest advice, if your oil pressure is ducking down under load. Check your crank endplay. I caught mine and everything in the motor was salvageable except the crank. it should be between .004 and .008.

dug

iTrader: (10)

was that caused by the oil pressure dropping?

01ssreda4

iTrader: (96)

I have a feeling that the crank sliding around was causing the fluctuation in pressure upon accel. Mine happened like this: I would punch it, it would downshit and the rpms would jump up, then the oil pressure would go 60-70 psi, then it would fall back to 40 or so (per factory gauge) for about a second then it would go back to 60+ for the remainder of the pull. Im not saying thats the OPs problem just something that only takes a second to check for piece of mind. I originally thought it was an intial oil drainback issue and found that lots of times after a fresh oil change it would stop doing it for a while. I put in another shortblock, same pump, pickup, pan, etc and it hasnt happened since. My new shortblock has .005 endplay, which i will be checking regularily.

SuperSport01

To the posts that said add more oil, dont. You should never overfill the oil. The motor can lose more oil pressure due to windage (the oil being whipped into foam/aerated oil)

RsSean

iTrader: (27)

Mobil One 5w30, the only reason tha tI don't think it is a o ring issue is it is only in first and second gear.

Well after I read the rest of the posts, it has nothing to do with the lifter trays. Know that for a fact. I just have a feeling that is is getting slammed to the rear of the pan. and then the pick up has no oil push threw the pump. I still have no idea. It may be a poor connection at the sensor. Since it would be in the back and hard to see.