BB oil pump gear design.

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Bighead440

Bighead440

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Minor question, but do "Ford" style gerotor gears move more oil than the MoPar usual kind? If you notice, the Milodon badass billet pump uses thinner but slightly larger diameter gears that they call "Ford" gears. These gears are more "spikey" instead of shorter/fatter rounded Chrysler gears. They used to claim less HP loss and more volume than a M-63HV, which I am fond of, with their external pickup systems. I saw a TRW oil pump gear kit for a regular-volume M-63 or OEM pump WITH the Ford style gears. Being the same thickness and diameter, I'm wondering if it would move more oil than the Chrysler gears do in a stock housing. Maybe with less HP loss than a HV? I like HV pumps with wide bearing clearances and thin oil (10w-30 etc.), and especially for a street engine with 1/2 or 3/4 grooved mains and internal oil pickup routing, this might be the trick. Anybody have any facts about the gear efficiency? Opinions? Thanks
 
I'm with you on the HV pumps and bearing clearances. I've run both gerotor and gear type pumps without issue. Prefer the gerotor type but would run either. 65'
 
I've tested oil pumps before using a test rig that measures power loss. There isn't much there to chase. Maybe a couple of hp at most.
 
AndyF said:
I've tested oil pumps before using a test rig that measures power loss. There isn't much there to chase. Maybe a couple of hp at most.
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Have you tested that Milodon "Ford" gear pump? I'm just curious if I could make an "in betweener" out of a stock housing using these old TRW gears I saw.
 
oldkimmer said:
So do u think these Ford gears will the dodge housing without any modifications? Kim
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Kim they are TRW drop-in replacement gears. I usually just throw OEM high mileage pumps in the bin "just in case," and stick a Melling assembly on, but the design of these gears got me curious about the Milodon "race" pumps. No one on here really cares about minute HP loss or revamping an old pump housing, which I understand, but I thought (wrongly) that someone would know the advantage to that design (if any). Not a big deal, but I'm going to try it. I have a refresh-job (rings and crank bearings) on a 413 coming up when the crank is done and I think I'll try the TRW gears and 80lb. spring on it, with 1/2 groove mains and see. Not a high RPM build, conservative hydraulic cam and 3/8" oil pickup. Also I have a short-rod 456" (4.402" bore 400/3.75 crank) B with full grove mains to assemble (1/2" pickup), so that would really be a good test.
 
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