Performance gains from advancing timing?
06-13-2012 | 02:25 PM
#11
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Joined: Jul 2002
Posts: 2,233
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From: pa
36 should be about right.
38 is probably zero additional power, and running unnecessarily closer to the detonation threshold. My guess is that unless you are running a strict diet of 93 octane, you ought to bring it down a couple of degrees. If you feel you have lost rpm, you can always bump it back up.
That's the good thing about a boat. If you leave the trim settings alone and run with "timing setup A" and then "timing setup B" back to back, the one that makes the most power will show up on the tach. (It's best to run slightly less than optimal trim for these "dyno" runs to ensure consistency - unless your boat runs real close to getting an additional chine out of the water on top end in which those cases can exaggerate a performance increase).
MC
38 is probably zero additional power, and running unnecessarily closer to the detonation threshold. My guess is that unless you are running a strict diet of 93 octane, you ought to bring it down a couple of degrees. If you feel you have lost rpm, you can always bump it back up.
That's the good thing about a boat. If you leave the trim settings alone and run with "timing setup A" and then "timing setup B" back to back, the one that makes the most power will show up on the tach. (It's best to run slightly less than optimal trim for these "dyno" runs to ensure consistency - unless your boat runs real close to getting an additional chine out of the water on top end in which those cases can exaggerate a performance increase).
MC
06-13-2012 | 11:01 PM
#12
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Joined: Jul 2010
Posts: 122
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From: northern nj
use the stock setting
I freshened up a 454 mag over the winter, and tried different total advance settings on the dyno.Tried 30, 32, 34 and 36 degrees total.All were within a few horsepower.I had also previously tried advancing the timing with motor in the boat to 14 degrees from the stock 8 and saw no gain in rpm.
06-14-2012 | 02:19 AM
#13
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Joined: Oct 2000
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From: Omaha/LOTO
