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Thread: 96 GSX Idle EGT

  1. #11

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    OH...DOH!!!!

    I have a hose linking my 2 carbs together, then one return line.... could this be a problem???

    My pump is mounted on the side of my hull, no engine mount.

    Took pump apart, check valves looked great, diaphragms looked great......

    EDIT..... could the way I have the carbs set up, be causing the pressure build up in the PTO carb and just dumping fuel causing the cylinder to run cooler?
    Last edited by pdxrealtor; 04-30-2008 at 11:46 AM.


  2. #12
    96XPSS's Avatar
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    Well...maybe I wasn't clear. There is one return fuel line from each carb. They Y together, into one line, going back to the tank. This single part of the Y is where the jet should be.

    This is all on the return side, not even taking the supply side into consideration.

  3. #13

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    No you were clear.

    Mine just aren't wired up like that, and I take it they should be.

  4. #14
    Tool Bag water worx's Avatar
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    How were you sending fuel back to the tank ??

  5. #15
    96XPSS's Avatar
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    Hmm...a pic sure would help. The vapor separator and how it's connected has me concerned.

  6. #16

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    Uhhhhh....workign on pic.... been busy

    In the mean time, Harry from Group K informed me there needs to be a 60 jet in the return line 't' fitting, in the "t" that leads to the top of the A/F sep., well there isn't and never has been.

    I have some things to change up, and I know what I need to do do we'll see where that gets me. I'll take before and afters!

    Thanks, your advice has made me realize what I need to correct!

  7. #17
    96XPSS's Avatar
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    Good deal! I'm glad I helped you figure it out.

  8. #18

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    Alright, reworked, about 3 psi at throttle.

    Tell me this is right, or if it's not!

    From the pump, 2 lines into the a/f sep. from the bottom of the sep., I "Y"ed the single output into 2 fuel inputs, one for each carb. Correct??

    Then I have 1 return line off each of the carbs "Y"ed into one return line.

    That leads down to a T with another 60 jet in the top of the T that leads to the top of the a/f sep and continues to the return of the tank.

    Does all this sound right?

    EGT's are almost equal, I had it out today for some high speed runs. Mag is a tad hotter and seems a bit leaner.

    How hot is MAX on a 787 GSX EGT?

    96XPSS.... did you drill the stock orfices on your carbs? Are they the NOVI modded 40 I series?
    Last edited by pdxrealtor; 06-09-2008 at 12:48 AM.

  9. #19
    96XPSS's Avatar
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    Quote Originally Posted by pdxrealtor View Post
    96XPSS.... did you drill the stock orfices on your carbs? Are they the NOVI modded 40 I series?
    Yes, one was drilled, then I drilled the other to equalize pressures.

    What you've done sounds good, although I'm not sure on the VS as I've never used one. How is the outlet being restricted on the outlet of the seperator if no restrictor jet is downstream of it?

    If I remember right, you don't want pressure to drop below 2 psi at wot.

    How is she running with these pressures?

  10. #20

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    The a/f sep. has 2 inputs, but only one output. Obvious how those are set up.


    On the return line, it is at the top of the a/f sep.. A line from the top comes down and "T"s into the return line to the tank. At the top of this "T" is a 60 jet.

    I think they have the jet at the top of the "T" because their inlet and outlet tubes are a tad bit large to accept a main jet.

    For WOT pressure, I made the mistake of not making a long enough fuel line to bring the gauge up front so I can actually see it while going WOT. LOL... If it idles at 3psi, you would think it would have plenty of pressure.

    However, the mag seemed to be running leaner than the PTO.

    I have 80 lows and 170 mains, 2 turns out on HS after a plug chop and lows at 1.5... they need dialed in.

    How hot should the max EGT be on the 787?
    Last edited by pdxrealtor; 06-09-2008 at 12:52 PM.

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