wrd1972

iTrader: (12)

Standard volume vs. 10% volume on LT1 oil pumps.

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Having trouble finding the right oil pump for my forged 355 LE2.
I dont want the Melling M55a due to the thin casting failures I have been reading about. I will be running the stock LT1 oil pan.

That leaves the Melling select:
10554 STD volume oil pump
10552 10% boost in volume oil pump

Can I run the 10% higher volume oil pump without having the pan sucked dry issues or should I stay at the STD volume. I think the majority of the problems have been from the 25% oil pumps.

What do you guys think about these two pumps.
Thanks

Ls1Bait

I run a melling high volume pump and I havent had a problem. I also have a canton 6-quart oil pan. I dont have the part number but I can check if you need it?

wrd1972

iTrader: (12)

I am going to be running the stock oil pan, therefore I cant be sucking the pan dry.
The question is will the 10% over stock cause this problem?

Fire67

iTrader: (3)

We have the 10% increased volume one in a 355 LT4 running the stock pan. We're dropping the motor out in a few weeks because it pulls the pan dry with that pump.

Unless your gonna run a aftermarket pan, get the std volume for sure.

wrd1972

iTrader: (12)

Thats the information I definitely need.
Thanks

Ls1Bait

Any reason you cant run a bigger pan?

and yea you can ONLY run a stock pump with a stock pan!!

wrd1972

iTrader: (12)

I have the Arizona speed and marine middy headers. The driver side header routes the same way as the stock manifold and does not like larger pans.

If there were a bigger pan that would work with that header I would get it.

Ls1Bait

I see..............

wrd1972

iTrader: (12)

Yup, I am stuck with the stock oil pan, so I need the most oil pump I can get as long as there are no starvation issues. Sounds like I need stock volume.

GIZMO

iTrader: (8)

The stock oil pump works just fine. Anything else robs HP. I run factory oil pumps in my Stock Eliminator motors (7200+ rpm).

If you want a slightly bigger pan that will not get in the way of anything run one from a late 90's pick-up.

Daren

Ed Wright

iTrader: (1)

And I clip the spring in mine to 40 psi to save a few hp. Bearing still always look like new. Just put rings in it and re-used the bearings. Used to use 30 psi in my old C/SM 283" Camaro, 9000 RPM, bearings did fine also. Shorter stroke, however. Gave this one 10 psi more.

Do you know about Stewart's low volume pumps? James Lee put one in his Super Stocker, but I'm a little nervous about going that far.

GIZMO

iTrader: (8)

Please PM me any info that you have. I might try one. Right now I have my new motor back apart weighing the pistons and rods. Are you sure that you want to get back into class racing?!!

Daren

Ed Wright

iTrader: (1)

Darren, I'll have to get his ph # from James Lee. I'll email it to you Monday.
I'll also tell you how he is making them. Looks stock. A good machinist could do it for you. Bobby & Jeff may be interested.

I'm not going to get too carried away this time, sure as hell not running any NHRA nat'l events. I don't know how anybody that runs a business could afford to spend most of a week, and maybe not even race on Sunday. We have an IHRA nat'l event here at home as well as a devisional, and NHRA devisionals all around me. Should be enough racing for me. I didn't run all the brackets here last summer. The car fits from SS/IA to SS/Ka, but I'll probably stay in SS/JA.
I still kinda like the LT4 for SS/GT. I'd have to buy a stick tranny set up for that deal. They don't allow the LT4 with an auto.

Ed

9formula4

iTrader: (5)

why not get a high pressure instead of high volume? that way your not getting sucked dry and still being able to maitain the stock pan?

Ed Wright

iTrader: (1)

What do you need high pressure for? A properly built small block Chevy needs neither. I run mine at 40 psi with the small pump, and have run 9000 RPM engines at 30 psi (didn't have synthetic oil back then) and no bearing problems at all. I don't know why they even make and sell high volume pumps for the sbc. I have never seen an engine that needed one. High oil pressure is like high tranny line pressure, takes more power to make more psi. Stock 60 psi LT1 pump is all you could ever need if you built the engine correctly.

Good luck, Ed

Snyper

iTrader: (27)

I have a mellings HV pump with the Highpressure spring installed. Using it with the stock pan. I was told to do this by my engine builder.

Fire67

iTrader: (3)

You might want to watch an oil pressure gauge very closely next time you go WOT through a few gears. My buddy's car starts dropping psi immediately following a gear change.

dhdenney

iTrader: (53)

Dumb question, maybe even newbie sounding but what if you ran an extra quart of oil in the stock pans to avoid sucking it dry (with HV pump)? Or is the crank already hitting the oil at that point? I've never actually known where too full is "too full." Just something to kick around and talk about. I've never ran over 7 qts in my deep pans (first Canton and now Milodon). I have the HV55 pump.

Ed Wright

iTrader: (1)

I fill my oil filter then put 4 qts in the pan, so that comes to about 4 1/2 qts. But, I don't ever use a high volume pump. Got off those things about 30 years ago. I can't see just pumping oil in circles, into the pump, out the relief back into the pan. Just makes heat and eats power. Even quit running them in circle track engines. Started with them when I began doing roundy-round engines in the '80s because the other locals were using them, and they all told me they were needed. I found they weren't need there either. I don't know why they even make them. Something else to sell, I guess.

Good luck, Ed

seawolf06

iTrader: (8)

The HV pumps take a little more HP to turn, but the HP ones just have a different relief spring. It's still the same pump and therefore doesn't require any more hp to turn.