Oil pumps: High velocity, high pressure, both, neither?

Discussion in 'Technical' started by scooper77515, Jan 1, 2008.

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  1. scooper77515

    scooper77515 No current projects.

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    I have read lots of conflicting research. You all know my driving habits...what do you all think I need?

    EDIT--I said "velocity", sorry, meant "volume"...
     
    Last edited: Jan 1, 2008
    scooper77515, Jan 1, 2008
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  2. wagesofsin

    wagesofsin Official Lurkologist

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    either way you'll be fine. h.v/h.p. wont hurt anything.
     
    wagesofsin, Jan 1, 2008
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  3. PINKY

    PINKY .....John Ford.....

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    I run a regular ole' MELLING pump in mine....never had a problem.
     
    PINKY, Jan 1, 2008
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  4. Blown 5.0

    Blown 5.0 Hooked on BOOST MEMBER

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    Bearing and other clearances tight? If so run a standard pump, no need to put undue pressure on the distributor gear and pump shaft.
     
    Blown 5.0, Jan 1, 2008
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  5. don graham

    don graham MCG State Rep

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    I've always heard you need hi volume rather than high pressure. But, I'm like john, i just use a Standard Melling and never had any pump problems.:)
     
    don graham, Jan 1, 2008
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  6. scooper77515

    scooper77515 No current projects.

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    Sounds like a good place to start a poll...

    I will be using a hardened shaft (Anna keeps giggling when I say that:bouncy:) either way.

    Good point on the gear...if you need to run a hardened shaft (be QUIET Anna!!!) then those forces are being applied to something...

    But my gut logic says more oil is better, so I was leaning toward high volume.

    I have heard that the high pressure foams up the oil, etc.

    So, I am still confused...
     
    scooper77515, Jan 1, 2008
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  7. Blown 5.0

    Blown 5.0 Hooked on BOOST MEMBER

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    If the clearnces are tight there is no need for a high volume pump, Where will all that volume of oil go? It wont, the pump will just bypass and start heating the oil. These pumps work ok in worn (and or a loosely built) applaction where a standard pump just cant supply enough volume.
     
    Blown 5.0, Jan 1, 2008
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  8. scooper77515

    scooper77515 No current projects.

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    Well, this is a newly rebuilt motor so clearances should be up to spec...

    Well, this thread makes my choices in oil pumps MUCH less expensive:bananaman
     
    scooper77515, Jan 1, 2008
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  9. Blown 5.0

    Blown 5.0 Hooked on BOOST MEMBER

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    Now i DID NOT SAY to buy a cheap pump. I always run the stock Ford with the regulator set at 50 psi.
     
    Blown 5.0, Jan 1, 2008
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  10. scooper77515

    scooper77515 No current projects.

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    No, it won't be a cheap pump. Just not the extra expense of HP or HV.

    Any suggestions on brand?

    I have already gotten a -1 on mellings from a member who had a bad experience...
     
    scooper77515, Jan 1, 2008
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  11. M.A.V.

    M.A.V. Yep,my real initials.

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    Melling standard here.
     
    M.A.V., Jan 1, 2008
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  12. don graham

    don graham MCG State Rep

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    I got one recently from my speed shop. It came in a 'Federal Mogul' box. I just went out and opened it. In side the pump had stamped on it M68HV.
    (Melling High Volume).:)
     
    don graham, Jan 1, 2008
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  13. wagesofsin

    wagesofsin Official Lurkologist

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    the reason you need a hardened gear is your going to run a roller cam. a standard cam does not need a hardened gear due to the composition of the cam gear itself .ductile iron is fine for a standard flat tappet. distributor drive gears are a sacrificial lamb. alot easier to change the drive gear, than the cam gear. and the hardened shaft is for security, standard ones like to twist up , or worse yet snap, and we wouldnt wanna see you twist, or snap your "shaft" now would we?
     
    wagesofsin, Jan 1, 2008
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  14. PINKY

    PINKY .....John Ford.....

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    :sarcasticclap: this is why I don't post any advice on this board :sarcasticclap:

    more and more I am started to agree with TL :yup:

    Run your HP/HV pump...... start blowing seals and starving the pan.......it will be great! :D BUT, atleast you can say you have one :D
     
    Last edited: Jan 1, 2008
    PINKY, Jan 1, 2008
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  15. Bluegrass

    Bluegrass Jr. mbr. not really,

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    For real dependability in race applications, the Melling is now not the pump it used to be.
    The gears and gerotors are now compressed powdered metal construction. There have been reports of gears coming apart.
    Use a standard pump in a new motor.
     
    Bluegrass, Jan 1, 2008
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