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Thread: exhaust gas temp help

  1. #1
    Senior Member EXPERT BUILDER
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    exhaust gas temp help

    how do i go about increasing or decreasing it if i lean it out some and increase the timing is it gonna go up
    any info is appreciated
    thanks logan

  2. #2
    Senior Member RACING JUNKIE oldandtired's Avatar
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    Both leaner mixture and increasing timing will increase exhaust temps.
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triumph of evil is for good men to do nothing" Edmund Burke

  3. #3
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    ok thanks

  4. #4
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    Quote Originally Posted by oldandtired
    Both leaner mixture and increasing timing will increase exhaust temps.
    not saying you are wrong but......

    doesn't having the timing too late, retarded.....increase temps in the exhaust tract? instead of burning in the cylinder, the fire is started too late and is burning as the gasses are exiting..?

  5. #5
    Senior Member RACING JUNKIE
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    Maxpower has a point I think-

    See previous thread Bruce commented on about Outlaws glowing header. Same principle. I too have seen this on circle track cars many times too (glowing headers)... I even had a similar problem with a XR400 dirt bike that ended up being too rich & made the header glow at idle. I think Bruce made a similar post then b/c I was making the problem worse... doing the opposite. He was right. His explanation even applies to the simplest of motors on a single cylinder motor cycle engine.
    "I would walk through hell on Sunday before I fear the enemy"

  6. #6
    Senior Member RACING JUNKIE
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    But then again maybe I am talking about two different things???

    Exhaust temp VS late/ unspent gasses & ret timing??? I don't know... I am still learning. It would seem that lean & hot timing DOES also cause higher ext temp; but also a rich condition with lower timing can do it too... just by means of unspent fuel burning later in the ext tract.
    "I would walk through hell on Sunday before I fear the enemy"

  7. #7
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    Re: exhaust gas temp help

    Quote Originally Posted by mrbigtrucks
    how do i go about increasing or decreasing it if i lean it out some and increase the timing is it gonna go up
    any info is appreciated
    thanks logan
    how about posting some info on your combination...and where you are in regards to tune...timing and your fuel delivery, etc..

  8. #8
    Senior Member EXPERT BUILDER
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    sbc
    9:1
    477/477 268 duration cam
    torker intake
    holley 750 witch is to big
    some 1.94/1.5 heads stock besides springs and i had them milled to increase compression
    :twisted: - logan

  9. #9
    Senior Member SENIOR BUILDER
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    dear Logan,

    sbc doesn't tell me much



    cubic inch? bore n stroke please.......

  10. #10
    Senior Member EXPERT BUILDER
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    just a std bore 350 completely stock bottom end
    not much to tell


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