best hi speed placement?

Discussion in 'PSI Superchargers Tech Questions' started by nmro2114, Apr 12, 2011.

  1. nmro2114

    nmro2114 Member

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    I have a Hilborn -4 and the high speed is plumbed in right at the pump. Would it be better to move it up to behind the barrel valve? It is an Enderle K valve. I have a flow meter so I currently have one of the 2 outputs off the valve blocked off.
     
    #1
    nmro2114, Apr 12, 2011
  2. Don Onimus

    Don Onimus New Member

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    High speed

    You sure it isn't a pump sizer? What does it flow? I would let the BV see the fuel first, but that is just how I do mine. Din
     
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    Don Onimus, Apr 12, 2011
  3. Mike Canter

    Mike Canter Top Dragster
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    To be absolutely correct a Pump Sizer works the same as a High Speed. Think about it...you have a 30 psi poppet on it so it comes on right after or right at launch. You then have another bypass that comes on at 50 or 60 or whatever psi. So really the "Main Jet Circuit", which is also a bypass, consists of the main jet, the pump sizer and any other bypasses.

    It makes no difference to have the bypass right above the pump or behind the BV execpt that the pressure is going to be slightly higher right at the pump so it will flow a little more. So if you moved the position of the bypass from behind (after) the BV to by the pump you would need to take that little difference of flow into consideration. My personnal preferance is to have them right after the pump.
     
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    Mike Canter, Apr 13, 2011
  4. Don Onimus

    Don Onimus New Member

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    hy speed

    Cool Thanks Mike I was just saying if he thought it was a High Speed, and not a pump sizer, it may not be taking away enough for him. Thanks for explaining it better. Don
     
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    Don Onimus, Apr 13, 2011
  5. Ken Sitko

    Ken Sitko Super Comp

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    The reason for putting it behind the barrel valve is to allow the motor to run rich at the launch so it has enough fuel to get through the first 60 or 100 feet without spinning or shaking. If you have either of these problems, you can usually fix it by adjusting the spring pressure of the high speed.
     
    #5
    Ken Sitko, Apr 13, 2011
  6. nmro2114

    nmro2114 Member

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    thanks Mike I thought that was the case
     
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    nmro2114, Apr 15, 2011

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