Fuel - Hat vs. Intake

Discussion in 'PSI Superchargers Tech Questions' started by Moore, Jun 17, 2009.

  1. Moore

    Moore New Member

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    Would like some input from people with experience. What do you recommend for fuel distribution between the hat and intake percentage wise? Going to run a 512 KB, Aj heads, 1471, converter in front of a B&J 3 speed, in a 1800# dragster. I have a very simple system - no electronic fuel management. 17.2 gpm pump, pump loop if needed and a high speed if needed. I've had more help than I need and it has been costly. Any input would be appreciated.
    Thanks in advance, I just want to learn and get down the track without hurting more parts.
     
    #1
    Moore, Jun 17, 2009
  2. craig moss

    craig moss Member

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    #2
    craig moss, Jun 17, 2009
  3. Moore

    Moore New Member

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    I just retired from a hydraulic pump manufacter, and understand the basic hydraulics. I flowed the system (but not with a tuning expert as you suggested) after listening to the wrong people and cooked the rings, but still don't know what works best. 50 -50 or 60% in the hat and 40% in the intake, or some other distribution. Just looking for input on distribution between the hat and intake.
    Thanks
     
    #3
    Moore, Jun 18, 2009
  4. eli

    eli Banned

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    70 % hat nozzles, 30% port nozzles, http://fuelinjectionenterprises.com/tuneup.htm check this site out and it would be smart to have the system flowed, By Spud Miller. ;)
     
    #4
    eli, Jun 18, 2009
  5. Mike Canter

    Mike Canter Top Dragster
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    On a Rootes blower 60% in the hat or as much as you can get in the hat to cool the incoming charge and lubricate the blower. The only hold back is if the port nozzle jets get too small and can block from dirt. I don't like to go below a 38 jet in the port and try and keep them above 40. The problem is the whole fuel system interacts upon itself. As you know with your background in hydraulics you have to balance the jet area against the pump flow against the fuel pressure.
     
    #5
    Mike Canter, Jun 18, 2009
  6. Moore

    Moore New Member

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    Mike,
    Thanks for the feed back, now I know I'm not completely in left field. I was working on a system that would be 60-70% in the hat was told I was nuts. I would have a couple of 34's in the intake, but I can change that and still keep the pressure I want.
    Thanks again. Moore
     
    #6
    Moore, Jun 18, 2009
  7. 3-D

    3-D Member

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    i have been told that the 60%/40% split on the roots is a good baseline. I have port nozzels down to 30's in my manifold. I needed to do this to keep the fuel pressure up with my pump (13.2 gal). I have had 2 nozzels pplug during a run, but found out that fuel was installed in the fuel cell without the funnel filter, BAD! I am now going to install a filter between the pump and the barrel valve to eliminate the possibility of this happening again. my combo is a BBC conventional headed motor with a Kobelco 8-71. Runs 6.70's @ 197.
    hat nozzels are 46's and ports are between 30's and 38's
     
    #7
    3-D, Jun 23, 2009
  8. Fuel Cars

    Fuel Cars AA/AM

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    Mike, any truth about pointing the nozzles in the hat upward instead of down into the blower to further cool and vaporize the fuel?
     
    #8
    Fuel Cars, Jun 23, 2009
  9. Mike Canter

    Mike Canter Top Dragster
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    I tried it that way and I didn't see any difference and turned them back down.
     
    #9
    Mike Canter, Jun 23, 2009
  10. A.T. Terenzio

    A.T. Terenzio New Member

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    TO ALL call Randy Anderson he has a filter that go in the main fuel line fitting on the barrel valve that should end all your dirty fuel issues
     
    #10
    A.T. Terenzio, Jun 23, 2009
  11. secondwindracing

    secondwindracing top alcohol

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    A T I got one of the cone filters that go in the barrel valve works good..but it should for over $70.00 bucks..got mine from RBS..Dave
    www.myspace.com/daveloweswr
     
    #11
    secondwindracing, Jun 23, 2009

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