Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: jets

  1. #1

    jets

    i have a jetting question, sbc with a holley 750 79 jets primary and 80 secondarys, plugs are black? it has a comp cam. 292 501 lift, 202 intake just a mild motor, autolite #26 plugs . any help i am a dummy!!!!

  2. #2
    Senior Member RACING JUNKIE BEAST477's Avatar
    Join Date
    Feb 2007
    Location
    Michigan
    Posts
    1,908
    What size sbc and what kind of rpm's are you turning it? Be honest is this a street or race engine?
    BEAST477






    Only a rich man can afford to use cheap parts.

    http://www.racingjunk.com/profile/177549

  3. #3

    jets

    sbc 355 drag race 7000 max

  4. #4
    Senior Member RACING JUNKIE BEAST477's Avatar
    Join Date
    Feb 2007
    Location
    Michigan
    Posts
    1,908
    Are you running power valves? Could be one is blown. Is it possible your primaries are open too far exposing the transfer slots?
    BEAST477






    Only a rich man can afford to use cheap parts.

    http://www.racingjunk.com/profile/177549

  5. #5

    jets

    no power valve are out

  6. #6
    Senior Member RACING JUNKIE BEAST477's Avatar
    Join Date
    Feb 2007
    Location
    Michigan
    Posts
    1,908
    Have you set your idle mixture screws on your metering blocks? If not check them. Start at 1 1/4 to 1 1/2 turns out. Is it loading up at idle or does im seem rich at all rpm's?
    BEAST477






    Only a rich man can afford to use cheap parts.

    http://www.racingjunk.com/profile/177549

  7. #7

    jets

    all 4 are set at 1 1/2

  8. #8
    Senior Member DYNO OPERATOR
    Join Date
    Aug 2007
    Location
    Lost Creek, WV
    Posts
    533
    Check your float level too.

    TS1955

  9. #9

    jets

    yes floats are ok. all 4 corners are 1 1/2 turns. . just don't know were to start with jets. they were new and after warming up engine i pulled the #1 plug and it was real black. funny thing is when i went in house. my white socks were black. went right thru my work pants and turned them black. i have zoomie headers. don't know if i should wait and make a pass then check them at the end of track. thanks for the help, john

  10. #10
    Senior Member DYNO OPERATOR
    Join Date
    Apr 2008
    Posts
    504

    Zoomies? what the hell

    Take the Zoomies off the heads and use a conventional manifold or header and you will get some engine vaccum signal back that the zoomies are killing at idle. Beast was correct about the power valve issue, accept that you do not have enough vaccum signal at idle to keep fuel atomised at low engine speeds like a blown valve would act like.
    If you love them zoomies more than performance, then you are right where you should be with that set up. Gasoline carb set ups with zoomies net no idle power or tuneability in most all cases. When you get your blower you will be all set with them zoomies.
    Bruce

  11. Racing Junk


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Email us - Support@RacingJunk.com
Call us - 866.326.9227
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy