Register now to get rid of these ads!

? about headers

Discussion in 'The Hokey Ass Message Board' started by box50, Jun 3, 2011.

  1. box50
    Joined: Nov 4, 2010
    Posts: 179


    Does putting headers on your car make it run hotter,heard this the other day just wanted to know if this is true. I want to make my flathead true dual's Thank's
  2. pasadenahotrod
    Joined: Feb 13, 2007
    Posts: 11,776

    from Texas

    If that were true, NO flathead Ford would have exhaust headers. It is not true, so they do.
  3. el Scotto
    Joined: Mar 3, 2004
    Posts: 4,490

    el Scotto
    from Tracy, CA

  4. In a way it is true due to the fact the motor will run leaner. You will need to watch the plugs to be sure.

  5. Johnunit
    Joined: Dec 31, 2010
    Posts: 93

    from Toronto

    in theory, no, but here are a couple possible reasons why it may appear that way:

    1. the increased flow of a set of headers will cause a lean condition in many engines previously tuned with restrictive manifolds. Lean running tends to be hot running, so from that you could have a car overheating after the addition of headers. Richening up the mixture would fix this though

    2. headers, especially uncoated/unwrapped headers will cause far more heat in the engine bay (if you run a hood;)), so this will have the effect of you feeling more of a rush of heat when you open the hood, and could cause a minor change in actual running temperature because you're sucking in warmer air through the carb.

    there are a couple of other ways I've heard suggested for headers and/or freeflowing exhaust to make a car appear to run hot, but I think they all relate back to the fact that you've significantly changed the engine as a "system" by opening up the exhaust end of things and changing the tuning pressures (in terms of waves within the exhaust) at a given RPM. This can all throw a previously well-tuned carb out of wack, but that's what a screwdriver and jet kit is for.
  6. Joey7319
    Joined: Nov 7, 2007
    Posts: 119


    I had never heard that headers would make an engine run hotter until the other day at a cruise in. some guy walks up to my car and says that engine must run pretty hot. when he explain why I was just confused. The car runs cool all the time. No car I have ever had with header ran hot unless something else was wrong with it, like a stuck thermostat.

Share This Page

Register now to get rid of these ads!


Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.