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Old 07-08-2010, 04:03 AM
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454 high volume or standard oil pump

I've been reading about oil pumps and I'm confused.. I understand that you want a high volume oil pump with high performance applications where the gaps between bearings are wider to maintain good pressure.. I also read that the high volume pump uses more power and increases oil foaming. I'm building moderate street motor that will occasionally hit a race track but I may put my foot in it sometimes of course.. What pump should I use and why. Or is it something that I will figure out when I check with plastigauge?

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Old 07-08-2010, 04:16 AM
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I didn't have enough time to really research it. I see it isn't a clear cut answer and mostly opinion. I'm gonna check the tolerances on the pump that I have (look new on outside lol) and if it checks out thats the one I'll get and if it doesn't then I guess I'm get the cheaper one.
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Old 07-08-2010, 06:55 AM
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Just from what you have said....I would imagine you will have stock clearances in the bearings....and you will have the stock oil pan (4 1/2-5 quarts)......I would go with the stock pump.
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Old 07-08-2010, 06:57 AM
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If the engine is a reasonably fresh build, the standard oil pump is all you need. You don't want four quarts out of the five (or whatever the capacity is) in the lifter galley and on top side of the heads all trying to get back to the oil pump through those drain holes so they can be fed to the screaming bearings again.

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Old 07-08-2010, 07:08 AM
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Quote:
Originally Posted by ekacpuc
What pump should I use and why.
As long as the engine has normal bearing clearances, a standard volume pump w/"high" pressure relief spring will work fine for you.

The old rule of thumb is 10 psi per 1000 RPM. IMO as long as the engine has 50 psi w/the engine hot, at road speed, you are good to go. Others may disagree w/this, and that is fine.
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Old 07-08-2010, 07:30 AM
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I would be wary of the Melling M55/M77 pumps (standard volume)-there have been many reports of the Gears failing, as Melling switched to powdered metal gears (unless something has changed recently)-also, there has been quite a bit of discussion that the Pump housing casting is thinner-
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Old 07-08-2010, 04:41 PM
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Melling has used powder cast gears for a long time with few problems in clean oil. The problem they have had is the use of cheap China cover screws and a re-design of the M55 pump that makes it weak and will break off at the mounting point..In performance applications.. I have a couple examples of the problem on display at the shop...

I very seldom use the M77 HV pump. A lot of the excessive wear noted on the front cam/t-set thrust area of BB chevies can be blamed on heavy oils and high volume pumps..
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Old 07-08-2010, 04:59 PM
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You know, I put a high volume pump in my 350 years ago. No problems but on hindsight, I wouldn't bother to do it if I did a new engine. One thing (among others) that Chevy really got right was the oiling systems. I guess I'm becoming more minimalistic in my old age but I think this is a case of "If it aint broke, don't fix it!" I would run a stock pump. Or at least what was stock on an L-88 or LS-7.
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