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fire out my exhaust?

Discussion in 'The Hokey Ass Message Board' started by kelseydum, Nov 13, 2011.

  1. kelseydum
    Joined: May 27, 2007
    Posts: 183


    Got my new 350 in the rod finally (it's a 1973 350 rebuilt stock). It's running really good, but for some reason am getting a shot of fire coming out of the exhaust. This only happens when it's at idle in park or neutral and I hit the throttle hard. I did notice it happen the other night on the freeway… I got her up to about 90mph and when I let off a small flame came out.

    Is this due to incorrect timing, maybe carb running rich… or someone mentioned re-adjusting the valves after the motor was broke in??? What do you think?
  2. brigrat
    Joined: Nov 9, 2007
    Posts: 5,407

    from Wa.St.

    Valves set, carb floats to high, vacuum leak, sticky valve, timing, carb linkage adjustment to accelerator pump, any or all, ................
  3. handyandy289
    Joined: Sep 19, 2010
    Posts: 354

    from Georgia

    X2 any or all of the above. check carb first.
  4. Are you using stock manifolds ,headers or WHAT?
    Fire is not going to run thru 10 ft of exhaust pipe..give some detail

  5. burnout2614
    Joined: Sep 21, 2009
    Posts: 612


    The type of exhaust you have is probably contributing to this. How can you see the flame? peace
  6. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,608

    Rusty O'Toole

    Most likely a misfire in the ignition or too lean mixture allowing a slug of unburned gas out the exhaust, when the engine fires so does the exhaust.
  7. hotrod40coupe
    Joined: Apr 8, 2007
    Posts: 2,562


    What are you complaining about? Most guys have to pay extra to have that happen...
  8. marvbarrish
    Joined: Dec 23, 2007
    Posts: 207

    from SoCal

    If you have glass packs on the car. It's your mufflers. If the exhaust gets real hot they'll come apart like that.
  9. Standard gas&oil
    Joined: Dec 3, 2010
    Posts: 289

    Standard gas&oil
    from USA #1

    X2 It could be worse, there could be smoke coming out. I will take flames any day.
  10. Flathead Johnny
    Joined: Jul 26, 2011
    Posts: 744

    Flathead Johnny
    from MA

    dam right!!!! and people dont f with your ride when they see flames coming out of the exhaust!

  11. Fire coming out of the exhaust, you consider this a problem? 'Long as the engine is running fine, and you have fire coming out of the exhaust pipe only, I see no problem.
  12. el Scotto
    Joined: Mar 3, 2004
    Posts: 4,466

    el Scotto
    from Tracy, CA

    The lakes headers on my A-boner would have a 6" blue flame at cruise coming right out the center, looked cool at night, would shoot small flames out when putting the clutch in after a high speed blast, and also when down shifting to slow the car down.

    I always thought it was pretty rad.
  13. arkiehotrods
    Joined: Mar 9, 2006
    Posts: 6,542


    Kelsey, I was drag racing a friend 33 years ago at twilight in my '70 GTX. (He had a '66 Chevelle). I was several lengths ahead of him and when I backed off at the end of the run, he said flame was coming out both pipes. I consider that a good thing. I wouldn't worry about it. Enjoy your ride! (Love your pinstriping and other artwork, BTW)
  14. GassersGarage
    Joined: Jul 1, 2007
    Posts: 4,727


    Ha, ha, my friend had a Vette with an L88 hood and sidepipes. The BBC was running nitrous. One night, during a race. a sheet of flame blew out from the back of the hood, over the top and flames shot out from the sidepipes. It was quite a sight.
  15. I'm calling it normal, I've had it happen (from what people behind me said) letting off the gas with headers, short mufflers and a steep set of rear end gears.

  16. mercmaniac
    Joined: Sep 17, 2004
    Posts: 158


  17. It's not entirely abnormal, especially with a short exhaust, to get some flame or popping when you let off the gas. You can dick around to adjust it to make it stop if you want, sometimes it's as simple as an exhaust leak and a rich mixture.
  18. Bigdaddyhemi
    Joined: Sep 1, 2010
    Posts: 361


    What cam are you running. A long duration cam can cause this but really nothing to worry about if that is what it is,, I wish I could get mine to do it. I have flame throwers on my 50 pickup but there is a time and a place and it's not on the
  19. kelseydum
    Joined: May 27, 2007
    Posts: 183


    Thanks for all the replies. I'm using a worn out Quadrajet I'm almost positive has vacuum leaks, so I picked up a new Edelbrock 600cfm I'll put on there. Also my exhaust comes straight up out of the hood (if it had a hood) like the old derby trucks and they are about 2 1/2 feet tall... basically tight fit headers flipped upside down with glasspacks connected to them. It didn't do this with the other motor but it did have vacuum leaks from that same quadrajet.

    Anyway, thanks for the replies and I'll see if this new carb helps.
  20. :eek::eek::eek::eek::eek::eek::eek::eek: :confused::confused:
  21. mysteryman
    Joined: Apr 20, 2011
    Posts: 253

    from atlanta

    curious what kind of car is some pictures
  22. sololobo
    Joined: Aug 23, 2006
    Posts: 8,245


    WE NEED PIX!! ~sololobo~
  23. most likely internal leakage from the q-jet. High vacuum under decceleration is drawing extra fuel into the cylinders and out the "stacks", imho.
  24. 42hotrod
    Joined: Nov 3, 2005
    Posts: 811

    from S.E. Idaho


    Glasspacks sticking up where the hood should be?

    This I gotta see......

    I demand pictures!!
  25. Uh oh. You're not running a tractor grille are you? Seriously, pics would be interesting.
  26. Uh, oh...I smell a RAT.
  27. kelseydum
    Joined: May 27, 2007
    Posts: 183


    Not a rat! A traditional rod... something your young hotrodder would have built back in the day... and could afford... and could drive the crap out of. It does have some personal touches to it, but EVERYTHING on there is functional right down to the custom windshield wipers. It's a '37 Ford frame with a '46 International Cab, custom bed... custom everything else. Grill inspired by the '34 Ford. All new suspension and brakes, power windows and a tailgate that's not welded shut. All old school parts besides the new suspension and brakes. I built it 100% with my own hands and learned a LOT along the way.

    The exhaust was actually an idea from my father-in-law who is a true blue traditional guy... I know it surprised me too.

    Next project is a 1929 Desoto... possibly with a Dodge 270 HEMI!



    I'll get some full shots up soon, if any one wants to see it.
  28. 63FalconFutura
    Joined: Feb 18, 2010
    Posts: 308

    from Socal

    you got those tractor pull headers and your complaining about flames?
  29. kelseydum
    Joined: May 27, 2007
    Posts: 183


    The old motor didn't flame and the new motor does. I was just trying to make sure nothing was going to blow up on me... I just dropped around a grand on the motor which is a lot of money to me.

    The headers are good ceramic coated headers too, even though you can't see them.
  30. Yeah, for some reason it's tough to see the exhaust in those pics...

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