Enter your username:
Do you want to login or register?
    • Forgot your password?

    Login / Register




    Results 1 to 4 of 4
    1. 12-26-2007 #1
      Moabdude's Avatar
      Moabdude
      Moabdude is offline Registered User
      Join Date
      Feb 2007
      Location
      The Netherlands
      Posts
      332
      Country Flag: Netherlands

      How to adjust my Demon carb

      My 69 Nova has a demon carb. it runs about 1200RPM at idle. There are 4 screws, 2 on each side. Which one do I need to set the RPM to about 900?

      1968 Camaro, 400SBC, Baer T4 13", Airride, Autometer, 18" Intro's, March, LED taillights, Magnaflow, König seats.
      1969 Nova, LS1/4L60e, Bear brakes, ridetech suspension, AFX spindles, 69 Camaro bumpers + some custom touches.
      Reply With Quote Reply With Quote
    2. Sponsored Links
    3. 12-26-2007 #2
      John McIntire's Avatar
      John McIntire
      John McIntire is offline Registered User
      Join Date
      Aug 2004
      Location
      NJ
      Posts
      1,295
      Country Flag: United States
      you shouldnt have to touch those. Theres a screw on the throttle linkage that you can slowly back out to bring down the RPM. Look around where your throttle cable hooks up to your carb linkage
      My 1967 Camaro
      Reply With Quote Reply With Quote
    4. 12-31-2007 #3
      MonzaRacer's Avatar
      MonzaRacer
      MonzaRacer is offline Registered User
      Join Date
      Sep 2006
      Location
      Southern Indiana
      Posts
      4,709
      Country Flag: United States
      Well first you need a vacuum guage hooked to manifold vacuum to do it right. if its an auto trans let it idle against a wheel chock or have someone hold the brake while you adjust.
      Idle it down to around a 1000, then run each of the side screws in till you see the vacuum guage needle drop towards zero then backj it out till the vacuum goes backup. Then reset your idle speed and then try to maximise the mixture screws again till your satisfied its smooth and stable.
      The big problem with just idling it back down is it may be int ot he idle transition slots.
      Good Luck.
      Reply With Quote Reply With Quote
    5. 01-01-2008 #4
      jvest's Avatar
      jvest
      jvest is offline New to Pro-Touring
      Join Date
      Sep 2005
      Location
      Enville TN
      Posts
      61
      Quote Originally Posted by MonzaRacer
      Well first you need a vacuum guage hooked to manifold vacuum to do it right. if its an auto trans let it idle against a wheel chock or have someone hold the brake while you adjust.
      Idle it down to around a 1000, then run each of the side screws in till you see the vacuum guage needle drop towards zero then backj it out till the vacuum goes backup. Then reset your idle speed and then try to maximise the mixture screws again till your satisfied its smooth and stable.
      The big problem with just idling it back down is it may be int ot he idle transition slots.
      Good Luck.
      MonzaRacer is correct on setting the four idle mixer screws. Make sure you set the throttle plate screws as instructed in the manual, so you get the butterflies postioned correctly on the transition slots. You'll want to use the ez-idle screw under the air cleaner stud to set your idle speed. The older tappered ez-idle screw will take more turns out from bottom than the newer blount point ez-idle screws. I've got the older style and it's around 5 rounds out.

      Hope this helps,
      Jim
      Reply With Quote Reply With Quote


    « Previous Thread | Next Thread »
    Get our mobile app (iOS)!

    Follow Pro-Touring.com on Social:


    Advertise on Pro-Touring.com