Glowing headers....
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Glowing headers....

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    Senior Member matt1840's Avatar
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    Default Glowing headers....

    So im sure most of you know i got my boat running, its running really well actually except for a few small hickups.

    Ive made a few straight header passes on the water and even cruised about 2500-3k rpm with no water (had valve off on accident) I notice my headers are glowing at the water inlet lines on the bend and the head right at exhaust port has changed color a small amount.

    Im running 2 edelbrock 750 carbs right outa the box stock configuration. running 2 full turns out on the idle mixture screws.

    What causes a hot or glowing header?? lean condition, timing, im at a loss. never seen this before on any application. I wouldnt think im lean, ive got alota fuel pumpin...

    Right now im at 30* total at 3k rpm and about 16 at idle 900-1000 rpm. The olds guys on realoldspower.com say i can go 36 total but im not to keen on that.

    opinions, im all ears guys.

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by matt1840 View Post
    So im sure most of you know i got my boat running, its running really well actually except for a few small hickups.

    Ive made a few straight header passes on the water and even cruised about 2500-3k rpm with no water (had valve off on accident) I notice my headers are glowing at the water inlet lines on the bend and the head right at exhaust port has changed color a small amount.

    Im running 2 edelbrock 750 carbs right outa the box stock configuration. running 2 full turns out on the idle mixture screws.

    What causes a hot or glowing header?? lean condition, timing, im at a loss. never seen this before on any application. I wouldnt think im lean, ive got alota fuel pumpin...

    Right now im at 30* total at 3k rpm and about 16 at idle 900-1000 rpm. The olds guys on realoldspower.com say i can go 36 total but im not to keen on that.

    opinions, im all ears guys.
    If your timing is too far retarded, the fuel could still be burning on the way out of the header.
    Another Hot Boat refugee

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    Senior Member lbhsbz's Avatar
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    Excessive exhaust heat can be caused by lean, rich, timing issues, or any combination thereof. 30° doesn't sound too bad...double check it to make sure that's where it's set...then pull a plug and see how it looks.

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    Senior Member matt1840's Avatar
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    Quote Originally Posted by lbhsbz View Post
    Excessive exhaust heat can be caused by lean, rich, timing issues, or any combination thereof. 30° doesn't sound too bad...double check it to make sure that's where it's set...then pull a plug and see how it looks.
    I picked 30* for a good starting point.. Its a used distributer but the timing stopped advancing around 3k rpm. I set it at 3500 and left it. I know the 2 750's are way to much fuel for the motor to handle so maybe i running to rich? Possibly causing the heat? Ill yank and plug right now and take a picture.

    I cant read plugs so a little help would be appreciated.

    The plugs looked "wet" and smelled of fuel. It deffinetly not oil on them. Just by the smell and them being wet im guessing way rich.. ???

    Last edited by matt1840; 08-28-2009 at 11:03 AM.

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    Senior Member tx-19's Avatar
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    more than likley its just fuel that isnt burnt.mine glow all the time.going on the 4th season now

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    21 Daytona Outlaw's Avatar
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    Glowing headers are normal without water injection to them,
    most people running dry headers coat them(jet hot, ceramic ect.)
    to keep the heat inside the header. open the hood on a car with headers
    at night.
    if your wondering about being lean, read the plugs. IMO
    #55

  9. #7
    Senior Member matt1840's Avatar
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    Quote Originally Posted by Outlaw View Post
    Glowing headers are normal without water injection to them,
    most people running dry headers coat them(jet hot, ceramic ect.)
    to keep the heat inside the header. open the hood on a car with headers
    at night.
    if your wondering about being lean, read the plugs. IMO

    Im not genious but by reading some stuff on google about reading plugs, i come to the conclusion im rich, with to cold of a plug.

    Whats your guys expert opinion??

  10. #8
    gn7
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    Quote Originally Posted by matt1840 View Post
    I picked 30* for a good starting point.. Its a used distributer but the timing stopped advancing around 3k rpm. I set it at 3500 and left it. I know the 2 750's are way to much fuel for the motor to handle so maybe i running to rich? Possibly causing the heat? Ill yank and plug right now and take a picture.

    I cant read plugs so a little help would be appreciated.

    The plugs looked "wet" and smelled of fuel. It deffinetly not oil on them. Just by the smell and them being wet im guessing way rich.. ???

    You are dead fat. Too little timing and fat equal hot headers. Lean it down, advance the timing or both. Start with timing. Go to maybe 34. TWO CARBS DOES NOT EQUAL RICH. I just have never understood this line of thinking. Good luck on leaning down those Eddy carbs. Nothing to it, if you know them. But they sure as hell aren't Holleys Don't worry about your plug heat range at this point. there is no way to know what the range is when the deal runs like that.



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    i've been runnin dry headers for the past 4yrs and if i ever saw my headers glowing, you can bet yo asssss i find a spot to pull over at and check timing and fuel system. ran dry shorties on my gullwing for a month on my 13.5 to 1 505bbc and i ran that motor on the lean side cause it liked it, and never once did the headers glow, even near dusk.went to upswept coated dry headers once i bolted on the nitrous, ran a 450hp 2stage deal and never once glowed the headers.

    Dare to be different, if it turns out great you can claim you planned it that way.

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    gn7
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    One thing is for sure, you need to get it fixed. If your headers are glowing, think about what is going on with your exhaust valves. And I bet they aren't Inconel



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    Rollin With Fink fasterthanu's Avatar
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    30 is way to retarded, like said- 34 should help with the
    exhaust temps and clean up the burn.

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    Senior Member matt1840's Avatar
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    Yea im gonna fix it today bout to head to the shop to get some metering rods, and a timing advance kit from mallory to change rpm total timing kicks in.. This distributer i have is used and i think its been messed with internally, or the springs are crap... monday when i timed it on water it was maxed at 3k rpm, now its not maxing till 3600.. I think the springs are toast or somethin is catching and now allowing them to fully open..

    im not gonna run it until the timing is fixed within distributer and i can get it on the water to actually time it again.

    GN7 what you mean by "FAT"

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    Quote Originally Posted by matt1840 View Post
    Yea im gonna fix it today bout to head to the shop to get some metering rods, and a timing advance kit from mallory to change rpm total timing kicks in.. This distributer i have is used and i think its been messed with internally, or the springs are crap... monday when i timed it on water it was maxed at 3k rpm, now its not maxing till 3600.. I think the springs are toast or somethin is catching and now allowing them to fully open..

    im not gonna run it until the timing is fixed within distributer and i can get it on the water to actually time it again.

    GN7 what you mean by "FAT"
    Fat/Rich to much fuel. But like he said, set the timing first then see.......... One thing at a time....................................

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    Quote Originally Posted by gn7 View Post
    You are dead fat. Too little timing and fat equal hot headers. Lean it down, advance the timing or both. Start with timing. Go to maybe 34. TWO CARBS DOES NOT EQUAL RICH. I just have never understood this line of thinking. Good luck on leaning down those Eddy carbs. Nothing to it, if you know them. But they sure as hell aren't Holleys Don't worry about your plug heat range at this point. there is no way to know what the range is when the deal runs like that.
    That's cause some people for some reason think bigger carb=more fuel without realizing that carburetors are rated for AIRFLOW, not fuel flow. I even had a friend once state that he was leaning out and was gonna fix it by installing bigger carbs! Of course that's not the correct way to fix a lean condition, but IF you were to fix a lean problem that way, one would think you'd do it by putting SMALLER carbs on for LESS airflow.



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