Facts about top fuel dragsters.

Discussion in 'Off-Topic' started by MattG, Feb 23, 2016.

  1. MattG

    MattG Gold Member Hellcat Car Club

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    Lost my one email account by retiring and found an old email with some interesting facts about Hemi's.
    It is dated, back In 2003 so the time / speed records are broken by todays Hemi's

    I hope you like.

    FWIW
    -----------------------------------------------------
    This is a little off topic but good reading for "Piston Heads"
    John from Ventura 57/270

    1.One top fuel dragster's 500" hemi makes more horsepower than the first 8
    rows at the Daytona 500.

    2.Under full throttle, a dragster engine consumes 1 1/2 gallons of nitro per
    second, the same rate of fuel consumption as a fully loaded 747 but 4 times
    the energy volume.

    3.A stock hemi will not produce enough power to drive the dragster's
    supercharger.

    4.Even with nearly 3000 CFM of air being rammed in by the supercharger on
    overdrive, the fuel mixture is compressed into nearly solid form before
    ignition. Cylinder run on the verge of hydraulic lock.

    5.Dual magnetos apply 44 amps to each spark plug. This the output of an arc
    welder in each cylinder.

    6.At stoichometric (exact) 1.7:1 air/fuel mixture (for nitro), the flame
    front of the nitro measures 7050 degrees F.

    7.Nitro burns yellow. The spectacular white flame seen above the stacks at
    night is raw burning hydrogen, dissociated from atmospheric water vapor but
    the searing exhaust gases.

    8.Spark plug electrodes are totally consumed during a pass. After 1/2 way,
    the engine is dieseling from compression, plus the glow of exhaust valves at
    1400 degrees F. The engine can only be shut down by cutting the
    fuel.

    9.If spark momentarily fails early in the run, unburned nitro builds up in
    those cylinders and explodes with a force that can blow the block to pieces
    or split the block in half.

    10.Dragsters twist the crank (torsionally) as far (20 degrees in the big end
    of the crank) that sometimes the cam lobes are ground offset from front to
    rear to re-phase the valve timing somewhere closer to synchronize
    with the pistons.

    11.To exceed 300 MPH in 4.5 seconds, dragsters must accelerate at an average
    of 4 G's. But in reaching 200 MPH well before 1/2 track, launch acceleration
    is closer to 8 G's.

    13.If all the equipment is paid off, the crew works for free, and for once
    NOTHING BLOWS UP, each run costs $1000 per second.

    14.Dragsters reach over 300 MPH before you read this sentence.

    15.Top Fuel Engines turn ONLY 540 revolutions from light to light!

    16.The redline is actually quite high at 9500 RPM.

    17.The current dragster elapsed time record is 4.477 seconds for the quarter
    mile.

    Charlie Schreiber
    Propulsion Systems Engineer
     
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  2. Lord Hellcat

    Lord Hellcat Gold Member Hellcat Car Club Gold Supporting Member HCC UK President HCC Charter Member

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    That was some great reading MattG. Many thanks :)
     
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  3. DGatzby

    DGatzby Gold Member Hellcat Car Club HCC Charter Member Midwest Regional Pres.

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    Lots changed, wow 1000' in 3.68 seconds.
     
  4. 45colt

    45colt Gold Member

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    Nice write up , haven't been to a drag race in years
    Used to go quite a bit.
     

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