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Thread: max cruise timming

  1. #1
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    max cruise timming

    if you got fuel adjusted 126-132 what would be the maximum timming you would want to run on a light cruise?

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    Fuel Injected! sturgillbd's Avatar
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    Are you running Vortec or swirlport heads on this engine?

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    there swill port

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    Fuel Injected! sturgillbd's Avatar
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    Most people find 26-30 degrees max works best on those heads. Attached is my swirl port headed V8 table. It is $0D on a 7427 so you will have to interpolate. As always use at your own risk but this is nothing radical. This is in a light vehicle. It seems like Dave W. posted a performance table for TBI and a 7747. Your V6 may want more or less advance so just play with it and watch knock counts.

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    Quote Originally Posted by sturgillbd View Post
    Most people find 26-30 degrees max works best on those heads. Attached is my swirl port headed V8 table. It is $0D on a 7427 so you will have to interpolate. As always use at your own risk but this is nothing radical. This is in a light vehicle. It seems like Dave W. posted a performance table for TBI and a 7747. Your V6 may want more or less advance so just play with it and watch knock counts.
    That is WOT, cruise timing is limited to 42 + Initial on a V8. I generally run up to 10 initial at the distributor. Cruise timing for swirl ports can be as high as 48. My Vortec likes up to 52 at light throttle cruise.

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    thanks for the info. been adding 1 degree at a time and its starting to come alive. no knocks yet except on start ups and shut downs 21 and 9. seems funny not adding oil every week.
    Last edited by ony; 07-14-2016 at 04:12 AM. Reason: more info

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    Fuel Injected! sturgillbd's Avatar
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    Here is the thread I was talking about. http://www.gearhead-efi.com/Fuel-Inj...BI-ECM-1227747

    I had quite a few knock counts at cruise above 33 degrees. Each engine is different.

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    that's some good info,fast if I set initial timming to 6btdc do I just set the inical in the bin the same?

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