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Old 01-16-2003, 02:18 PM
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Post Chevy oil pumps

Melling oil pump
A discussion several years ago with Smokey Unik about oiling systems, and one of the things that they both agreed upon was the over use of hi-volume oil pumps in stock clearanced motors (it's the first thing the Chevy guys purchase to put in their new motor, whether they need it or not)! The problem lies in the fact that the pump puts out way to much volume for the stock clearances to expell. The extra volume of oil has to go somewhere, so it lifts the relief and, on most pumps (ours included), is dumped back to the inlet side of the pump. This continual recycling (the relief will basically never close in this situation) builds unnecessary heat in the oil, as well as creating cavitation which aerates the oil - both things are bad news. Again, do NOT use more oil pump than your engine is designed to use! The Ford engineers knew what they were doing when it came to sizing the pump to the application! Stick with the stock (M19) pump on all but heavily clearanced motors!

Note: I looked up the m-19 pump and this does not relate to anything that melling manufactures today??
#M-55
SBC Standard volume

#M-55A
SBC Standard volume High pressure

#M-55HV
SBC High volume (+25% vol.)

#M-155HV
SBC High volume (+25% vol.) with 3/4" Inlet

#M-10555
SBC High Performance (+25% vol.) 3/4" Inlet

[ January 16, 2003: Message edited by: Knobie ]</p>

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Old 01-16-2003, 03:52 PM
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[quote]Originally posted by Knobie:
<strong>Melling oil pump
The problem lies in the fact that the pump puts out way to much volume for the stock clearances to expell. The extra volume of oil has to go somewhere, so it lifts the relief and, on most pumps (ours included), is dumped back to the inlet side of the pump. This continual recycling (the relief will basically never close in this situation) builds unnecessary heat in the oil, as well as creating cavitation which aerates the oil - both things are bad news.
[ January 16, 2003: Message edited by: Knobie ]</strong><hr></blockquote>

I've been saying this for years, so it's not new
or ground breaking to me, if you're going to use
a high pressure pump, you don't want to use a Fram
filter, I've had 2 lubricate the chassis and rear
tires...( one split down the lenght of the case,
and the other blew the whole can off...)
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