required gpm

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by WIDEOPEN231, Jun 19, 2017.

  1. WIDEOPEN231

    WIDEOPEN231 Member

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    Working with fella on his TA/D. He has new enderle dual gear pump 19.5 gpm. Its on 509 ci AJPE Olds, 14-71 littlefield 54%. I figure it needs 13 gpm to motor. Figured checking with few of you guys on what you think.

    Asking because as he has it now my calculations he is at 12.2 to motor.

    While at it what pressure are you running at? Computer show his at 93. I like to be around 15e0 or above.
     
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  2. Mike Canter

    Mike Canter Top Dragster

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    How much boost at 8000 rpm. When you say 13 GPM needed then what DA is that at and what rpm?

    The standard pressure out of the pump before the BV is 125-130 psi at 8000 rpm
     
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  3. WIDEOPEN231

    WIDEOPEN231 Member

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    43 @ 8200 Da was right at 1200'.

    Normally on my stuff little higher than 130p psi around 150,mainly because Ralph set it up that way and most his flow charts work off 150 psi and operating close to it kept me from having to run new flows for lower pressure when I wanted to calculate actual flow to motor.
     
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  4. Mike Canter

    Mike Canter Top Dragster

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    13 GPM with 43 lbs of boost at 1200 ft is lean. i would start out with 14.4 GPM and get a plug reading and go from there. A lot depends on the camshaft.
     
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  5. WIDEOPEN231

    WIDEOPEN231 Member

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    not crazy about autolite plugs they run. Even now they do not show any heat.
    Computer readings cpl cylinders in 920 range. 12.2 to 12.5 gpm to motor,1/8 mile only reason got by with it. Most of the time I would call 920 fat(not 1/8 mile. This motor has hurt pistons with temps at 1000*.My thoughts bad placement of sensor or computer readings to slow to catch spikes from pump issue(old pump enderle 1200). It is what it is for now.

    As for cam ,no idea.Motor was bought injector to pan,used. Normally I would build my own combo,but as said this is someone else's deal.
     
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  6. Mike Canter

    Mike Canter Top Dragster

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    You cannot read Autolight plugs for combustion chamber temps. You need to switch to an NGK plug probably a R5671A-10 or a 6061-10. It takes fuel to make power so running a motor lean is not good and does damage if something small goes wrong. I would highly recommend not tuning by EGTs and tune by reading the plugs.
     
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    Last edited: Jun 20, 2017
  7. WIDEOPEN231

    WIDEOPEN231 Member

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    Agree on NGK's.Again not my car. Never had problem using EGT's,but then I always verify temps and plugs agree and bearings just for another opion.
     
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