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Technical Fast Rev/Return

Discussion in 'The Hokey Ass Message Board' started by RodStRace, Mar 2, 2020.

  1. RodStRace
    Joined: Dec 7, 2007
    Posts: 2,309

    RodStRace
    Member

    One of the unique attributes of racing engines I always tuned into was the ability to rev up and return to idle quickly. This was often the hallmark of a 'hot' engine.
    I'd imagine this was due to a few different things; Individual runner intakes, high compression and low rotating mass.
    What steps could be taken to safely get this kind of responsiveness in a street engine?
     
  2. 6sally6
    Joined: Feb 16, 2014
    Posts: 1,261

    6sally6
    Member

    Lotsa initial advance and a properly tuned carb.
    6sally6
     
    RodStRace likes this.
  3. A balancing job is a great start. Efficiency of large air volumetric combustion exchange process .. is next.

    That's pretty much it. Just money & time. Your personal finance investment may vary. :)

    You're welcome.
     
    RodStRace likes this.
  4. 302GMC
    Joined: Dec 15, 2005
    Posts: 6,262

    302GMC
    Member
    from Idaho

    A nice aluminum flywheel ...
     

  5. Lighten the rotating mass, all of it.
     
    rockable and VANDENPLAS like this.
  6. slowmotion
    Joined: Nov 21, 2011
    Posts: 3,204

    slowmotion
    Member

    Go in the pits at a dirt late-model race. Whole lotta WHAP..WHAP...WHAP...gonin' on! :D
     
    dirty old man and RodStRace like this.
  7. Pete Eastwood
    Joined: Jul 27, 2011
    Posts: 962

    Pete Eastwood
    Member
    from california

  8. olscrounger
    Joined: Feb 23, 2008
    Posts: 3,979

    olscrounger
    ALLIANCE MEMBER

    ^^^this! throttle a small block with just a flexplate-quick revs!
     
  9. A few years ago I had a late model "muscle car" it would rev quick but was REAL SLOW returning to idle, I hated that. I'm sure it was in the programming.
     
  10. oldiron 440
    Joined: Dec 12, 2018
    Posts: 1,509

    oldiron 440
    Member

    Now I want to go to the strip.......I wonder how much snow is on it?
     
    partsdawg likes this.
  11. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 6,869

    Bandit Billy
    ALLIANCE MEMBER

    My flathead has a snappy rev, kinda weird for a flathead but I like it. Aluminum Flywheel, aluminum Ross pistons on a merc crank, lots of porting, 471 doesn't hurt. :cool:
     
    kadillackid likes this.
  12. Sprint cars used aluminum rods, plus lots of drag cars. They had to be replaced more often.
     
  13. Like 302 GMC says Aluminum Flywheel.
     
    dirty old man likes this.

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