Offshoreonly.com - Performance gains from advancing timing?

Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - Performance gains from advancing timing? (https://www.offshoreonly.com/forums/general-q/278550-performance-gains-advancing-timing.html)

Quote:

Originally Posted by mcollinstn (Post 3708751)

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

I run 89 octain and ther 37.5 @ 3000 what do you think back off to 36

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.

Quote:

Originally Posted by rssteiny (Post 3708743)

My 500hps with upgraded carbs, bigger cams and all new valvtrain are at 37-38 @ 3000 you think thats to much.

With 89 octane, I wouldn't run more than about 35*