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Originally Posted by Flashmn
You wont really get more power from upping the timing, you might get knock though.
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i have to disagree.
i added 5 degrees timing and felt a marked increase in low end power. the F head design is very knock resistant as well, the combustion chamber is very compact and actualy most of it resides in the dish of the piston. with 15 degrees of timing 89 octane should be safe, but i run 93 since its not that much more cost than 89 and i've done a little more than just advance timing.
by advancing timing you're trying to put the LPP (location of peak preassure) closer to 14* ATDC where the angle of the rod, piston, and crank will transfer the most of the downward push into rotary motion. starting ignition a few microseconds sooner on a A-F engines wont do harm as long as you keep an eye on the plugs for any signs of knock. timing is set at 10* for emissions, to reduce the formation of NOX. however in my state my car isnt subject to NOX testing, only HC and CO.
signs of knock you can read on your spark plugs are
1. they'll be alot whiter than normal
2. you may see small speckles on them
if you see either of the above step up a grade of gas or turn the timing back. DO NOT adjust your timing without a timing light.
