Tuning by exhaust valve color
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Tuning by exhaust valve color

  1. #1
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    Default Tuning by exhaust valve color

    Has anyone heard of this. My valves are chocolate milk brown and the exhaust ports are a dull alluminum gray. Does this tell anyone anything?

    The plugs are very light tan and the ground strap is colored all the way back to where it's attached. The are NGK plugs.

    Tim

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  3. #2
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    I prefer to burn the cad on an NGK and disregard the exhaust color. I also like a pyrometer back up reading once in while or at least until I know the combination and how it colors a plug vs exhaust temperature.

  4. #3
    Senior Member stix818's Avatar
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    Quote Originally Posted by Fiat48 View Post
    I prefer to burn the cad on an NGK and disregard the exhaust color. I also like a pyrometer back up reading once in while or at least until I know the combination and how it colors a plug vs exhaust temperature.
    x 2.. Plugs do tell a pretty good story of what's going on.. Pyrometers are nice.. I've been monitoring 1 cylinder and I actually just picked up a Percy to monitor 2 more..
    Last edited by stix818; 08-08-2010 at 11:14 PM.
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  6. #4
    gn7
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    The ground strap on the NGK is highly effected by timing. More so than jetting. Piston tops and chambers are probably the best indicator. But how many people can get a clean shut off and pull the heads? You can change jettiing a couple of jets up or down from perfect and not see much change in the exhaust valves or heater entrance. Anything after the first couple of inches into the header is of little use. Collectors and anything you can see fromthe collecter can only tell you if your way off. The color ring on the ceramic, down in plug is still one of the best indicaters. I look at the edge at the end of the threads as well, but we run the plug for quite awhile longer per run, than you guys.



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