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Got a ? about open hedders

Discussion in 'The Hokey Ass Message Board' started by box50, Dec 8, 2011.

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

    box50
    Member

    Just put some new hedders on my truck now got to get it to the muffler shop about 4 miles from the house. Other than being loud will this hurt anything,I have heard it could burn a valve don't ever remember thinking about that years ago just thought I would see what ya'll had to say about this.Thank's guys:confused:
     
  2. mastergun1980
    Joined: Oct 18, 2010
    Posts: 1,095

    mastergun1980
    Member
    from Alva OK

    I have heard that you won't burn a valve, in fact my buddy who runs open hedderes on his T and its fine. So go for it
     
  3. Any time you change the way an engine breaths there is a possibility that the air/fuel ratio will be changed. A free-er breathing exhaust will tend to lean the mixture out and this causes higher temps at the exhaust valve. If run quite lean for an extended period there a chance of causing damage, but 4 miles? It should be ok. It'd most likely be running pretty crappy if it was that lean.
     
  4. AAFD
    Joined: Apr 13, 2010
    Posts: 585

    AAFD
    Member
    from US of A

    Just drive it to the muffler shop, nothings gonna happen.
     

  5. Deuces
    Joined: Nov 3, 2009
    Posts: 21,588

    Deuces
    Member
    from Michigan

    Open the carb mixture screws about 1/8 to a 1/4 turn... You should be ok till you get to the shop... Just drive cool an' slow till you get there...
    Then re-adjust your carb settings when you get home...;)
     
  6. HellRaiser
    Joined: Jun 14, 2006
    Posts: 1,241

    HellRaiser
    Member
    from Podunk, NE

    It would be easier to pull the choke about 1/2 to run rich. IF you've got a choke on it.

    For 4 miles, personally I wouldn't worry about it.


    HellRaiser
     
  7. I run zoomies on my 29 sedan.
    I take the old Harley D approach, always run em a little rich and it works out OK. As one of the other members stated, lean is the enemy.
     
  8. tommy
    Joined: Mar 3, 2001
    Posts: 14,757

    tommy
    Member Emeritus

    It's an old wives tale perpetuated by people that are scared of their own shadow.
     
  9. Deuces
    Joined: Nov 3, 2009
    Posts: 21,588

    Deuces
    Member
    from Michigan

    It's best to drive too the shop in the morning when the "'boys in blue" are having coffee and donuts.. ;)
     
  10. The late model beater I just retired I bought with nothing attached to the headers and drove it some that way, and it still runs great thousands of miles later. Wasn't too gentle with it when the exhaust was off, either. I wouldn't worry about the 4 miles to the muffler shop, just go easy on the throttle if you don't want to get pulled over.
     
  11. R Pope
    Joined: Jan 23, 2006
    Posts: 3,309

    R Pope
    Member

    What, never been to a drag strip or an oval track? How about a boat race, or an air show? Lots of individual pipes and open headers there with no valve problems!
     
  12. olskoolspeed
    Joined: Mar 2, 2009
    Posts: 476

    olskoolspeed
    Member
    from Ohio

    This pretty much sums it up.
     
  13. Lucky77
    Joined: Mar 27, 2006
    Posts: 2,490

    Lucky77
    Member

    I've been driving my sedan for almost four years with open headers, plus chicks dig it. Don't be scared.
     

    Attached Files:

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

    box50
    Member

    Thank's guy's for all the info, I think it will be fine.
    .
     
  15. Don's Hot Rods
    Joined: Oct 7, 2005
    Posts: 8,319

    Don's Hot Rods
    Member
    from florida


    Bingo. I've driven with open headers for years with zero problems. Where this myth comes from I think is that if you just run an engine with NO manifold or header at all there is the possibility that cold air can be sucked into the open exhaust port and warp a hot valve. But I don't know if that even holds water.

    Don
     
  16. squirrel
    Joined: Sep 23, 2004
    Posts: 50,228

    squirrel
    Member

    all the burned valves I've fixed have been on vehicles with iron manifolds and full exhaust.
     
  17. Ever seen how short the exhaust pipes were on a P51 Mustang?
    [​IMG]

    Not that you would want to run them that short on a car, as the tuned length is for a constant RPM, not the way a car is driven, but it kind of proves the short open header vs valves thing is an old wives tale.
     
  18. Deuces
    Joined: Nov 3, 2009
    Posts: 21,588

    Deuces
    Member
    from Michigan

    Those look to be about????... 6" to 8" long...:rolleyes:
     
  19. cruzr
    Joined: Jan 19, 2006
    Posts: 3,125

    cruzr
    Member

    wont hurt a thing................as said...old wives tale
     
  20. You are going to have to lengthen your hood if you use this engine.:D
     
  21. squirrel
    Joined: Sep 23, 2004
    Posts: 50,228

    squirrel
    Member

    but it'll be SO worth it!
     
  22. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    X2. Some things are WORTH screwing up the proportions for!
     
  23. R Frederick
    Joined: Mar 30, 2009
    Posts: 2,658

    R Frederick
    Member
    from illinois

    Hood? Why? I'd want to watch it run.
     
  24. Deuces
    Joined: Nov 3, 2009
    Posts: 21,588

    Deuces
    Member
    from Michigan

    That would look good in the back of an ElCamino... :D
     

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