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  1. #1
    Join Date
    Jul 2020
    Posts
    9

    Default E-85 Carburetor help

    Guys we recently put together a 602 on E-85 and we cannot get the calibration just right. I'm not looking for trade secrets by no means. Any typical suggestions would be helpful. 650 E-85 QFT carburetor and everything recommended as far as fuel line, Pump, Regulator, PSI...On restarts car has a substantial stumble...If we try to cure that then it gets lazy at the end of the straight and has a nice orange flame backfire lol. Just looking for some things guys might be doing as far as carb tuning, Plugs, Timing...Any help is appreciated PS: Buying a new JDR is on the list but them as long as all the other builders are really busy and 3-5 weeks out so I'm trying to salvage something with what I have while I wait for a new carb

  2. #2
    Join Date
    Oct 2007
    Posts
    974

    Default

    first of all put the carburetor back the way it was when you purchased it---
    it's always a good idea to check passages in a production built unit but you shouldn't need to start changing calibrations on it to have reasonable success
    by checking passages ---I mean make sure everything is the same at least left to right and usually front to rear
    I have found QFT carbs that have orifices behind the power valve that were not drilled

    after you get your carb back to base line ---address the water temperature of the engine
    a good running E85 crate needs to be at 200 degrees on water---if you are below 190 then that is the place to start
    I can lay down several other things but we find water temp to be the biggest issue

    let me know if you need more
    Brad
    www.race-1.com

  3. #3
    Join Date
    Nov 2012
    Location
    Wisconsin
    Posts
    3,119

    Default

    Call blp or Braswell....they will help. Visit/join racingfuelsystems.com... Mike Laws and other pros are regulars.
    Member of the Luxemburg Speedway Hall of Fame
    Class of 2019

  4. #4
    Join Date
    Jul 2020
    Posts
    9

    Default

    Thank you Brad and Krooser.

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