kartracer0000

iTrader: (5)

hey guys, I haved searched for this answer but had no luck!!
I have been hearing different things from different people...
Is it alright to run a melling hv oil pump with the stock oil pan, Or do i need to run a aftermarket oil pan that holds more oil?

1994Z28Lt1

iTrader: (1)

High volume pumps with stock oil pans will spell disaster, you need to run an aftermarket pan with more capacity along with better oil control

kartracer0000

iTrader: (5)

i thank you for the fast responce.. about to button up the motor now.. thanks alot!

shbox

Most often, there is absolutely no reason to run an HV pump on an LT1.

Those that run stock pans are at risk. All it takes is one time to starve the pump and your bearings are toast. It may not have happened yet, but it certainly can.

wht97ws6ta

you'll be fine with the stock pan and HV pump. Theres only like millions of small block chevy's that have high volume pumps and stock pans. But unless your running more than .0025 of bearing clearance, then there is no need for a high volume pump. Robs more power to turn a HV than a SV pump. Just make sure the pickup screen is no less than an 1/8" from the bottom and no more than 3/8. I'm pretty sure you wont have any problems if you do that. And put a tack weld on the screen where it goes in the pump.

Lonnies Performance

iTrader: (16)

I've done enough of these to know for certain that you can have problems with high volume pumps & the stock pan. Do so at your own risk. Been there done that & will not do it again.

Buy a quality std volume pump & use the high pressure spring. This is what you should use & will suit most of the motors out there.

Elliott's94Z

iTrader: (12)

Looks as if I better get a different pan...lol Anyone have any suggestions on one?

slagger

iTrader: (1)

Don't these cars have a low oil sensor ?
run it and if you see the low level senor light on then you need a bigger pan.

slagger

iTrader: (1)

Here check out this site read the 5th Q down it should answer your Q.

http://www.badasscars.com/index.cfm/...=cat/cat13.htm

shbox

Plenty of input over the years from people that build engines for a living and have had personal experience with trashed engines tells me that the HV pump is a risk.

As already noted, it can rob HP, plus oil pump drive gear wear is accelerated. When the gear strips, what happens? Right. You're back to no oil pressure again. You can still end up with a trashed engine. I can't tell you how many threads I have read of people doing maintenance on their HV pumped LT1 and found their oil pump drive gear almost stripped. They considered themselves real lucky to have found it.

I know that there are plenty of SBCs out there with HV pumps, but for some reason the LT1 seems to be especially susceptible to problems with it.

A good stock pump with high pressure spring is all you should ever need. One supported over 1100HP in a drag car.

Rich2279

iTrader: (7)

I would just recommend using the steel piece instead of the plastic coupler on the shaft.

the_merv

iTrader: (88)

I had a Melling HP Pump in mine and it worked like a champ.

shbox

I am referring to the drive gear, not the drive shaft. And yes, I recommend the metal coupled drive shaft.

shbox

Sure, until the day that it doesn't.

Aside from the risk, why rob yourself of HP? People will do all kinds of stuff to gain the smallest amount of HP, then lose it with an HV pump that, in most cases, is not even needed.

Just choose wisely, is all I am saying.

blackz93

iTrader: (2)

Large clearances here(.0025 rods/.003+ mains) with stock volume pump and high pressure spring. Has plenty of oil pressure with 5W-30.

riceburnerZ28

iTrader: (20)

I've been running a Meiling hv pump with a stock style pan for a while now. The added pressure is good in my case because I have a oil cooler/radiator and about 8ft of hoses which keeps my pressure a bit above 40 psi. Also my engine builder recommended it !

shbox

There are good and not so good engine builders out there. People sometimes think if SV is ok, then HV must be better (simply, not always the case). This is one of those never ending debates.
I would hate to be scared about my oil pressure every time I wrung the engine out.

fergymoto

iTrader: (129)

Go to David Vizard's gofastnews.com and read up on the subject.

slagger

iTrader: (1)

but I think this topic was about stock oil pan with HV oil pump and people think they will suck it dry, not really about what pump they should run?

Lonnies Performance

iTrader: (16)

Years back I also believed in HV pumps, (I was taught this by old time engine builders that subscribed to this theory) but after further experience I found them to not be necessary. The latest designs of elliptical bearings, friction coatings & tighter clearances, I rarely see the need for them. I've lived through oil filters spitting their gaskets in cold weather & distributor gears wearing out to realize it is not necessary unless you truely have race only bearing clearances or something on the order of piston oil cooling or spring oilers to actually warrant the extra consumption. In these cases, only consider them with the proper baffled, high capacity pan.

Even the racers have learned to run as little oil pressure as possible with the thinnest oil to gain the last few HP. Ive seen race engines go down the strip with 35# pressure on 0W-30 oil.... not that I would recommend this on your street ride though.