I have to order my oil pump for my car and i'm a little confused on oil pump selection....both my good turbo buddy who has done a lot of turbo builds and my machinist both have said to get a high pressure/volume pump due to my twin application and to keep everything happy

so i planned to go with the melling version which requires a BB style pickup

Then i read a little bit up on melling's performance pump that is built stronger and is just a high volume pump

Can i get a little help?

 

A high pressure, but you will need to somehow limit pressure to turbos.

 

Well if i would have to limit pressure to the turbos.....why bother with a high pressure pump then?

 

How far of a run to the tyurbos and any other external parts needing oil feed..The longer the run the more the need for the high volume pump..The pressure thing i wouldnt worry unless your going to spin past 7K or you have a big external oil cooler with huge -8 or bigger lines..The high volume pump will help move the oil to prevent it frm getting to hot by lingering around in teh same area as well as keep it flowing through the added parts like your turbos better..At idle it may not keep up..Ive always run a stock reman pump on my street engines but found that in my RX7 the factory oil cooler is huge and has huger(i know its not a word but my kids say it a lot)
-10 feed and return lines..The stock oil pump wouldnt keep up at idle so i had to bandaid and remove the cooler..I run the mroso pump in my 406 and it seemed to work great but probally robbed me of power..Hell i'll give away 10HP to save the engine anyday..

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I would run a High pressure because I like to have good oil pressure to all the bearings. As I'm sure you know High pressure to the turbos can make them smoke.

I have HEARD stories of a high volume pump with stock pan pumping all the oil the the top of motor and then starving the rod bearings for oil.

my .02
Scott

 

So....

i'm still a little confused. Should i just go with a high volume pump?

My turbos are right in front of both cylinder heads and i'll be feeding them oil from right above the timing chain

still not quite clear on things

thanks

 

Oh, i just noticed you said something about a stock oil pan. Well, i'm running one...will that affect my decision?

Also, if i got the high pressure...how do i limit the pressure to the turbos?

 

Well Iam running -4 an lines to my turbos. On the 1/4 to -4an fitting the screws into the turbo, I had it welded shut then I drilled a smaller hole.

Some guys where talking about it a while back in the FI.
http://web.camaross.com/bb/Forum2/HTML/007316.html

Hope this helps

 

dude, you are insane. you are not limiting pressure with the small holes, only limiting quantity. in my experience with my turbo car, one of the upgrades was a bigger oil feed line. if you were to go as far as call garrett or another manny, they will tell you as much flow as possible, pressure makes no or little difference (as long as it isn't like 2 psi or something) difference with most turbos.

look, the reason for high pressure in a piston motor is the bearings around the crank and cam. you need pressure to keep the oil between bearing and crank. the bearings in a turbo don't depend on the oil bearing. it gets some lube from oil bleed thru, especially the ball bearing turbos. if you were to take a turbo apart as i have, you would see a simple solid bearing with no oil seals.

restricting your flow of oil to turbos is asking for trouble. NEVER, NEVER, NEVER do this. it is bad. dude take those restrictors off, or you will replacing to very expensive turbos.

 

what about an electric oil pump? save a few hp and be able to squirt oil before turning the motor on.

 

then you may have something wrong with your turbos. they should not leak oil. i have had several turbos that would happily take 85 to 90 psi without leaking. more than normal that is. i mean turbos burn more oil than n/a, but i never got worse than a quart to 1000 to 1500 miles. which is good for an n/a car, much less a turbo.

if they leak, then there is too much endplay, or sideplay in the centershaft. do they have ball bearings or solids? hmmm, strange. but they should DEFINITELY NOT LEAK at 50 psi oil pressure.