Melling 10687 oil pump data

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R.B.Phillips
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Melling 10687 oil pump data

#1

Post by R.B.Phillips »

For my new stroker, I installed a Melling 10687 pump from their Select line of pumps. When I fired the installed engine, I had 45-50 cold psi of oil pressure, which I wasn't satisfied with.

Melling Select line oil pumps come with an alternate bypass spring and an Allen head screw-in plug in place of the usual cup plug. My hardcore Ford friend Andy and I dropped the oil pan Saturday to swap in the alternate "green" spring that Melling says will raise oil pressure. This saves you the trouble of removing a soft plug and shimming the spring with hardware store washers, as we did on the standard M68 pumps back during the 5.0 Mustang craze.

Side tip: On a '68, you can drop the oil pan by removing the tubular unit body brace and the idler arm to lower the steering. This was easy using Andy's lift.

Upon reassembly and firing, we had 90 psi cold oil pressure (Valvoline ZR-1 20W-50) versus 45-50 (diesel 15W-40) with the default spring. For reference, my main bearing clearances are .002-.0025, and rods a bit tighter (I assembled it).

I wanted to post these real-world data so someone can search "oil pumps" in the future when building or rebuilding a short block and find them.

R.B.
Calicat
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Re: Melling 10687 oil pump data

#2

Post by Calicat »

R.B.Phillips wrote: 28 Jul 2021, 10:01 For my new stroker, I installed a Melling 10687 pump from their Select line of pumps. When I fired the installed engine, I had 45-50 cold psi of oil pressure, which I wasn't satisfied with.

Melling Select line oil pumps come with an alternate bypass spring and an Allen head screw-in plug in place of the usual cup plug. My hardcore Ford friend Andy and I dropped the oil pan Saturday to swap in the alternate "green" spring that Melling says will raise oil pressure. This saves you the trouble of removing a soft plug and shimming the spring with hardware store washers, as we did on the standard M68 pumps back during the 5.0 Mustang craze.

Side tip: On a '68, you can drop the oil pan by removing the tubular unit body brace and the idler arm to lower the steering. This was easy using Andy's lift.

Upon reassembly and firing, we had 90 psi cold oil pressure (Valvoline ZR-1 20W-50) versus 45-50 (diesel 15W-40) with the default spring. For reference, my main bearing clearances are .002-.0025, and rods a bit tighter (I assembled it).

I wanted to post these real-world data so someone can search "oil pumps" in the future when building or rebuilding a short block and find them.

R.B.
You can use the same trick to drop the pan on a ‘70 351C. Just for comparison, what is your hot oil pressure when idling now?
- Craig
1970 XR-7 convertible
deep gold w/med brown interior
351C-4V, FMX, PB, PW, SS wheels, competition handling
Cats from the past:
1967 XR-7 hardtop
1970 XR-7 hardtop
1977 Villager Brougham wagon
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R.B.Phillips
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Re: Melling 10687 oil pump data

#3

Post by R.B.Phillips »

Craig, just about 50 or a bit more.

R.B.
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Gaugster
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Re: Melling 10687 oil pump data

#4

Post by Gaugster »

Thanks for this information. I recently visited with Jay Brown (FE Power LLC) and believe he was making a similar modification on his dyno mule. He was noticing a slight drop in oil pressure but higher up in the RPM range if my memory is correct.
John - '68 Cougar XR7 390 FE (X-Code) 6R80 AUTO
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cougarsunlimited.net
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Re: Melling 10687 oil pump data

#5

Post by cougarsunlimited.net »

R.B.Phillips wrote: 28 Jul 2021, 10:01 For my new stroker, I installed a Melling 10687 pump ...
I use this oil pump in my '67 race car. It has a unique feature where the rotor is supported through a hole in the bottom of the pump cover.
This may cost some HP but it should help stabilize the oil pump drive shaft at high rpm.
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R.B.Phillips
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Re: Melling 10687 oil pump data

#6

Post by R.B.Phillips »

Yes, I recall seeing Melling's write up include the Gerotor shaft being supported at both ends....right?

Your application is quite the endorsement.
woodsnake
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Re: Melling 10687 oil pump data

#7

Post by woodsnake »

Thanks for posting, this is very timely for me, as I need to drop my oil pan on my 68. I put a new style one piece gasket in, and it *******leaks. I wouldn't have thought about having to drop the steering down, and I wasn't sure if removing the cross member alone would get it. Do you think I could get away without dropping the steering, just to do the gasket?
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R.B.Phillips
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Re: Melling 10687 oil pump data

#8

Post by R.B.Phillips »

Worth a try - my recollection is that the steering had to go to get enough forward motion to pull the pan all the way out.
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Al Bundy
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Re: Melling 10687 oil pump data

#9

Post by Al Bundy »

I pulled the pan off my X code without touching the steering.
1974 Dodge Dart - daily driver
1963 Thunderbird Z code - raven black/red
1968 XR7 F code - diamond blue/blue - SOLD
1968 XR7 J code - black/red
1968 J code - madras blue/aqua
1968 XR7 X code - lime frost/dark ivy gold
1968 GT-E XR7 W code prototype no. 500033 - cardinal red/black
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