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Thread: Demon carbs???

  1. #1
    Charter Member #71 Charter Member DanB's Avatar
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    Demon carbs???

    Anyone running a Demon 850 carb? Are they still made by Grant? Are parts (jets) etc interchangable with Holley.
    Any good bad or indifferent opnions? I'd prefer to get a Holley HP4150 but they dont seem to list a 850, only a 830

    Thanks

    Dan

  2. #2
    Platinum Member Platinum Member Smitty's Avatar
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    Thumbs up

    I run an 825 Demon Race carb on top of my Whipple. Yes it does use Holley jets, etc. I love it and it has worked flawlessly for two seasons now. Personally, I wonder if there is much difference between an 830 and an 850? I bought the Demon mostly because they build it at the factory to specifically be used in a blower application. It has totally different metering blocks and air bleeds from a regular carb. It saved me time from having to mess with it. I got baseline info from Whipple and tested mixture for 3 hours and it was dialed in.

  3. #3
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    Dan:

    Demon carbs are made right in America by Barry Grant Inc. (unlike some other carburetors) All of your tuning parts (Jets, PV, Sqtrs, Bowl & Metering Block Gaskets etc.) will interchange with Holley, Moroso, or most other manufactures. Based on the design the Demons will atomize the fuel more efficently, giving you better throttle response, TQ, and HP. If you're comparine vs. a Holley HP (non marine carb) the Mighty Demon is a much better choice. You get a better quality product for less money. I'd be happy to answer any questions you have, give me a call at the office (706) 864-8544 ext. 125

    Doug

  4. #4
    Registered tomcat's Avatar
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    While we are on the topic, can anyone tell me if the length of Demon carbs is different than the Holleys? Does the different looking fuel bowl stick out as far as the little nub on the Holley fuel bowl?

  5. #5
    Charter Member #655 Charter Member dyno's Avatar
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    Dan what are you running on your 540? an 800? I might be interested in it...if you upgrade that is. I have two 850's on my 454's way to much for me.
    If your boat has a sail do you ride a horse to the ramp?

  6. #6
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    Tomcat
    Overall lenth the Demons are about .200" longer than a Holley. If you have any other questions please feel free to give me a call at the office (706) 864-8544 ext. 125

    Doug

  7. #7
    Charter Member #71 Charter Member DanB's Avatar
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    Don
    Have a Holley hp4150 950 on my motor now. Seems to run good but the ports show its running too rich. It dynoed ok but I think overall I would be better with an 850.

    Bigwavez
    The 830 was built and calibrated to run on ford small block nascar motors, and Ive been told the are not good on marine motors by Teague

    Rumrunner
    Ill call you tommorow

    Thanks guys

    Dan

  8. #8
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    I'm running the Speed Demon 750's on my 454/400 Cyclones, they have worked perfect so far plus they do look cool.....Fred

  9. #9
    Charter Member #655 Charter Member dyno's Avatar
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    Fred did you switch them over or were they on when you bought the boat? if you bought them what did you pay for them?
    Don
    If your boat has a sail do you ride a horse to the ramp?

  10. #10
    Registered tomcat's Avatar
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    Thanks for the info RumRunner.


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