fuel flow sensor

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by td1506, Feb 22, 2018.

  1. td1506

    td1506 Member

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    Just bought a race pac fuel flow sensor
    Need to know where to plumb it
    Thanks in advance
    Gary Ny Moment 2
     
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  2. Mike Canter

    Mike Canter Top Dragster

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    You have to block off what is called the Port outlet of the Barrel Valve. The you need at least four inches of straight -10 hose out of the top outlet of the Barrel valve to the input of the flow sensor. Then run at least three inches of -10 hose to a Y fitting that has a -10 in and two -8 out. Connect one of the -8 output to the hat distribution block and the other -8 to the port check valve. Make sure the flow valve is the correct way around and it is marked IN and OUT. Also on the top of the sensor is a hand scribed K-factor like 5301. It is faint. That number is used in the fuel flow setup page as a flow calibration factor
     
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  3. td1506

    td1506 Member

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  4. td1506

    td1506 Member

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    Thank you Mike
    Gary
     
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  5. lucky devil

    lucky devil Member

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    Guys , can anyone tell me from experience what difference -10 will make over -8 ?
     
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  6. Mike Canter

    Mike Canter Top Dragster

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    Two things, more fuel flow and the bigger hose acts like an accumulator and helps smooth out the flow when lean outs turn on or off
     
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  7. lucky devil

    lucky devil Member

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    Thank you Mike , as I thought really .

    Has anyone done any back to back testing with some numbered results ?
     
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  8. blowntuner

    blowntuner New Member

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    with the bigger line you move more fuel esier to the nozzle.a an8 will run out off fuel flow on a normal pressure.If your nozzle pressure not increased during the rpm your line is to small.
     
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  9. lucky devil

    lucky devil Member

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    Thank you for the replies :)
     
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  10. td1506

    td1506 Member

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    We finally have added a fuel flow sensor to our BBC . Top Dragster What is the best way to use the data we get from this sensor.
     
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  11. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    Carefully. :)
     
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  12. lucky2wd

    lucky2wd Member

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    where is the best place to check the fuel pressure?
     
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  13. rb0804

    rb0804 Member

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    Right at the pump is the standard spot. Some people run two the second being at the port nozzles if you run ports and dribblers. It’s neat info to have both but not really necessary.
     
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  14. Mike Canter

    Mike Canter Top Dragster

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    Both the Jetsize and Alky Pro software wants you to hook up before the barrel calve
     
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  15. BlownHemiBos

    BlownHemiBos New Member

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    Tim - one thing that was shared with us that helped out in analyzing the data and decision making was creating a math channel in Racepak that calculates a ratio of boost / fuel flow.
     
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  16. Bjs344

    Bjs344 Member

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    Lean it out till it pops/bangs/smokes, record that number, repair, don't go that low again.
     
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  17. blowntuner

    blowntuner New Member

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    better spent some $$$ on some dyno testing,saves money and get's you quicker consistent
     
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  18. Mike Canter

    Mike Canter Top Dragster

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    Boost to fuel ratio is very rough and depends on what cam you have. I divide the GPM my the amount of boost. So 13 GPM divided by 35 lbs of boost is .37 GPM per pound of boost. The average is .35 but can vary from .28 to .40. This will work for any point you pick on the run. So if you know the amount of boost you expect to make than you can work it backwards by multiplying boost by .35 and get a ballpark figure of how much fuel to use. Then read the plugs to define more accurately
     
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  19. rb0804

    rb0804 Member

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    Great info Mike, thanks for sharing, with all of the good speed secrets that you give away it makes me wonder what you have hiding up your sleeve. Do you have an example of an engine that would use .40? I haven’t seen one that high yet, most of the larger engines I have seen are in the .32-.35 range. Most of the smaller engines have been in the .26-.30 range. Of course this depends on the type of blower amoung other things.
     
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  20. Mike Canter

    Mike Canter Top Dragster

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    They are not secrets just known guidelines but telling you when you would use a .40 would be a secret. These perameters are guidelines to put you in the ballpark and not to give you a tuneup. You got to take it from there by reading the plugs or whatever.
     
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