Fuel Pumps

super651
super651 Senior Contributor
edited November -1 in HUDSON
A few of us locals did the testing of the AMC and PINTO. We used a 308 block and installed a 309742 cam with New bearings. We then turned the block upsidedown so the fuel pump stroke could be checked with the cam-lobe.

When the AMC pump is used you need to install the gasket stack-pack and this will give you the Full Stroke of the pump arm and will not bottom out.

When the Pinto pump is used ,use only ONE gasket this will give you the full stroke of the pump and will not bottom out.

The Pinto pump will work with the Stack-pack gasket but,the pump will not get the Full Stroke (less fuel will be pumped)

This test was with the camshaft turned to the Max lobe lift on each pump and the clearance between the arm and the lobe checked for proper lift.

If you put the pumps side by side you will see that the lift lever is not in the same place with each other.

Hope this helps Rudy.

Comments

  • Unknown
    Unknown
    Dear locals - Great input, THANKS, this is what the forum is all about!



    49 Super Six Fred
  • Unknown
    Unknown
    super651 wrote:
    A few of us locals did the testing of the AMC and PINTO. We used a 308 block and installed a 309742 cam with New bearings. We then turned the block upsidedown so the fuel pump stroke could be checked with the cam-lobe.

    When the AMC pump is used you need to install the gasket stack-pack and this will give you the Full Stroke of the pump arm and will not bottom out.

    When the Pinto pump is used ,use only ONE gasket this will give you the full stroke of the pump and will not bottom out.

    The Pinto pump will work with the Stack-pack gasket but,the pump will not get the Full Stroke (less fuel will be pumped)

    This test was with the camshaft turned to the Max lobe lift on each pump and the clearance between the arm and the lobe checked for proper lift.

    If you put the pumps side by side you will see that the lift lever is not in the same place with each other.

    Hope this helps Rudy.



    while it all makes sense, the true measure would be to see how much volume is created when the pump is actuated. just saying the full stroke of the arm or partial for certain instances might not be a true representation of actual volume moved by the pump.



    I would think that optimally, full travel would be the most desired method, but if you guys find the time, any way we could get an unofficial volume measurement on this?



    I appreciate the fact that you guys took the time to actually explore this though, with an exposed bottom end.



    Good Stuff!
  • super651
    super651 Senior Contributor
    Left out the Most Important one.

    We primed each pump and installed a rubber hose on the inlet and outlet of both pumps. While turning the camshaft with a adapter and a large Drill Motor each pump was timed while turning. The AMC pump delivered 1/2 of a pint more that the Pinto.

    Hope this clears it up. Hudsonly to all Rudy
  • super651
    super651 Senior Contributor
    I GOOFED again. It was 1/2 cup more on the AMC PUMP.

    It is them SENIOR things at me . Thanks Rudy
  • Unknown
    Unknown
    good stuff!
  • 464Saloon
    464Saloon Senior Contributor
    One would think the pump for the larger 6 cylinder would have more volume. If that is 4oz per stroke that is actually quite a lot when you put an engine at speed.
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