Bbc rpm / timing question
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Bbc rpm / timing question

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    Default Bbc rpm / timing question

    I have a BBC gen 5. ALL STOCK. Anyone know what kind of rpm I should be getting? Also anyone do a little testing with timing on these motors? Any help would be great. I am running at 4900 rpm and the timing is at 34.

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    Senior Member bc18's Avatar
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    Quote Originally Posted by CROCKETT22 View Post
    I have a BBC gen 5. ALL STOCK. Anyone know what kind of rpm I should be getting? Also anyone do a little testing with timing on these motors? Any help would be great. I am running at 4900 rpm and the timing is at 34.
    Running same timing at 4500 rpm. What carb set up do u have I'm running 2 Holley 650's weiand tunnel ram and berkley bc impeller gps at 78.3 mph. What set up at mph u running at 4900 rpm?

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by CROCKETT22 View Post
    I have a BBC gen 5. ALL STOCK. Anyone know what kind of rpm I should be getting? Also anyone do a little testing with timing on these motors? Any help would be great. I am running at 4900 rpm and the timing is at 34.
    Actual HP (estimated) altitude of operation , Impeller cut , pump health as well as an accurate Tach all come into play here , maybe fill in the blanks ? Tom

    BTW FWIW if your at sea level with an accurate tach , an A impeller, a good working jet and around 450 HP your numbers are pretty close

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