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Thread: Dynoing motor end of week. How much HP

  1. #1
    Senior Member EXPERT BUILDER
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    Dynoing motor end of week. How much HP

    I was wondering hom much HP will come from a 540ci motor with 12 to 1 comp. set of dart 380s that flow 420 cfm, with a 871 BDS supercharger running 11 lbs of boost with enderle injection on alcohol, 810 lift cam 7-4 swap. Any guesses :?: :?:
    will be dynoing on friday or monday.
    Just trying to get an idea what to expect the computer dyno;s that I look up give me such a wide rangs of HP numbers.
    Blowninjected 540 - when is going fast, Fast enough ?????

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  2. #2
    Senior Member DYNO OPERATOR
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    ALOT!!

  3. #3
    Senior Member DYNO OPERATOR
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    Depending on what stage blower you have, I would say in the 1300 - 1400 HP range would be my guess.

    TS1955

  4. #4
    Senior Member EXPERT BUILDER
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    Blower is a stage 3. Hard case w/ teflon stripping
    Blowninjected 540 - when is going fast, Fast enough ?????

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  5. #5
    Senior Member RACING JUNKIE
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    Have you already had this motor running? i think it might be hard to get 11 lb's boost out of an 871 on that big of a motor and heads without running 25 to 30% overdrive unless it's a high helix blower. But if you can i would think anywhere between 1150 and 1300. I hope you have down nozzles on it.

    JMO

    Zip.

  6. #6
    Senior Member EXPERT BUILDER
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    Quote Originally Posted by zipper06
    Have you already had this motor running? i think it might be hard to get 11 lb's boost out of an 871 on that big of a motor and heads without running 25 to 30% overdrive unless it's a high helix blower. But if you can i would think anywhere between 1150 and 1300. I hope you have down nozzles on it.

    JMO

    Zip.

    Yes had 11lbs at +10% overdriven with this motor last year with less compression But hard to start. reason for going to 12 to 1 compression. Yes to the down nozzles.

    Thanks Zip
    Blowninjected 540 - when is going fast, Fast enough ?????

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  7. #7
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    starting problems are always improper barrel valve setting, too lean most of the time. pulling the fuel shut off valve and running it out of fuel, too much cranking to get it back up to pressure, or just some type of problem with the fuel system itself. down nozzles are way better for tuning each cylinder when you have egts. I tend to set the barrel valve around 30% and keep leaning it out until a have a dead spot or hesitation, then I go back 2-3 flats depending on engine idle temp. when the engine will idle all day @ 160, you have got it right and most likely will start great 1200-1300 hp should be feasible

  8. #8
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    Hear are the results !!! 1347 Hp at 7200 rpm and 1072 foot pounds of torgue at 5200 rpm. 540 ci motor with 871 supercharger 11 ponds of boost.
    Blowninjected 540 - when is going fast, Fast enough ?????

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  9. #9
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    Quote Originally Posted by blowninjected540
    Hear are the results !!! 1347 Hp at 7200 rpm and 1072 foot pounds of torgue at 5200 rpm. 540 ci motor with 871 supercharger 11 ponds of boost.
    SWEEEEEET! If you're scared of 'em let me know. I'll use 'em all for you!
    You know you gotta give us a video when you take it to the track!

  10. #10
    Senior Member RACING JUNKIE lively's Avatar
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    AND THATS ON PUMP GAS :lol: :lol: :lol: :lol:


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