So what's the better hoice of oil pump to go with?

I had a melling hv/hp in my car that siezed up and took out the oil pump drive. It worked flawlessly for the 2 yrs I had it.. but....

I've read where the best thing to do it go w/ a stock oil pump and replace w/ a high pressure spring? Mr. Gasket offers a spring upgrade. Summitt offers a melling stock replacement pump w/ oil p/u tube for like $40...

hrmm.. and what length does the oil p/u tube have to be?


TIA

 

What bearing clearance are you running, and how high do you rev your motor and what oil do you plan to use?

Rich Krause

 

0.0025..... 6,600.... and stock pan.

 

Shawn, Im in the same position you are. Im using the stock pan and deciding on the pump. Many have suggested the stocke melling while others the GM stock version.....

 

Shawn,

I'm running a pump from a C1500 truck modified with a corvette spring. My pressure is VERY stable at all rpms. It works like a champ!

Cody

 

I would use a moroso anticav standard vol. shim the spring for a little more pressure, and voilia.

 

That sounds like a good plan.

rich Krause

 

Jordon or Rich,

If I use the anti cav standard volume pump on a LT1 with a stock oil pan, what pickup tube would I need to order?

Also, they offer this pump in a blueprinted version, model 22112. Is this pump worth the extra $30?

Michael

 

Since we are talking about oil pumps

Whatever you decide take the pump apart. I learned a couple years ago on the 351 in my Comet. A brand new Melling pump was taken apart and there was quite a bit of "crud" inside. Black hard chunks of something.

Just add some permanent loctite to the threads when you are done.

I dont know about pressures yet but I went with a stock volume and pressure Melling with the "revised" Canton pan and pickup.

 

What bearing clearences and rpm would dictate what pump? Under what circumstances would you use sya a stocker w/ white spring or an aftermarket?

Castrol 10w30 here Looking for same answer

 

The spring will only effect pressure, and is determined by personal likes, and RPM the motor will see. for a 6500rpm motor I would wanna see 65psi @ 6500

For big(say .003+) main clearance, you should consider a high volume.

 

which ever you decide make sure you double and triple check your pickup to bottom of pan height. Many oiling problems I have heard about recently are a result of incorrect height after swapping motors/pumps.

DaveW

 

How do you know the right height?

 

With the pump/pickup assembly in place, lay a straight edge on top of the pickup screen. Use another scale to measure the diatance from the oil pan rail to the scale. That gives you the distance from the rail to the bottom of the pickup. Then measure the oil pan depth and you have your two distances and can calculate the screen to pan floor clearance. I usually like to see about 1/4"-3/8" clearance depending on the pickup type.

 

You should also include the thickness of the gasket that you'll be using. Some of the aftermarket gaskets are thicker than the OEM.