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Old 03-08-2009, 10:43 PM
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High volume oil pumps and deep sump pans

I was told by a mechanic that in order to use a high volume oil pump I also had to purchase A drag racing oil pan ,if not I would suck the pan dry at high rpms.I purchased a melling m55hv pump it says it flows out 20-25% more oil.I'm on a tight budget and don't really want to have to buy an oil pan.Do any of you guys have any experience with this?
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Old 03-08-2009, 11:10 PM
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This won't likely happen. However, why do you need a high volume pump.
If we a talking SBC, the standard pump volume is more than whats needed.
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Old 03-08-2009, 11:11 PM
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The verdict is out on the HV oil pump sucking the pan dry. Some guys swear they do, I do not think its possible. I had one occasion where I thought it might be true and it was in a racing boat with an HV pump. Long sustained 6000 rpms. It starved for oil, but no way to tell if it really actually sucked the pan dry. With the carnage that was in that engine there was no way to tell what happened.

The theory is this (in my opinion): Just because you have an HV pump doesn't mean the pump is actually flowing more oil. The engine still has the same tolerances and lube orifices, so its not actually flowing more oil. Any excess oil just gets bypassed directly back into the pan anyway. I believe that there is no way to suck a pan dry with an HV pump. Even if it did suck more out of the pan, it would only be temporary since excess bypass oil goes right back in the pan.

I've run lots of HV pumps in stock pans with no issues at all. I think your guy is full of poop. No way an HV pump would suck a pan dry. Like I said, I've even used them in marine builds that see high RPMs for long periods of time and never had any issues with a stock pan.
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Old 03-09-2009, 12:31 AM
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Well I'm building a pretty healthy 355 Chevy engine with 10.8 compression so i figured a hv oil pump would be a good idea.Now i'm thinking a 7 quart pan might be a good idea too.What would the benefits of a larger pan be?Better for detonation? I'm using iron heads so any detonation help would be good.
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Old 03-09-2009, 05:45 AM
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A bigger oil pan will do nothing to help detonation.A 7 qt probably isnt needed,I use a 6 ot pan on my big block.One advantage with a bigger pan is that you can leave the oil level down a bit to help reduce crankshaft windage.And,according to all the research I have done,its like curtis 73 said,its virtually impossible to suck an oil pan dry.This is just "an old wives tale".
Guy
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Old 03-09-2009, 05:57 AM
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Summit sells a very nice pan/pump combo under their name for cheap compared to name brands.I have one on my 350.It is the same pump with a welded pickup.It has a high press spring in it which I replaced.
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