| Lynn,
I know this is an old posting, but I save all of your posts for future reference. I was wondering if you could you comment on the amount of advance appropriate for a p-port engine? What is the max advance I should run with 100LL? Do the numbers you quoted below apply the same to p-ports as to side port engines?
As it relates to a p-port engine, what MAP readings should I get at idle (1800-2000 rpm)?
Thanks, Mark On Mon, May 16, 2011 at 12:10 AM, <Lehanover@aol.com> wrote:
Never at any throttle setting above idle. For closed throttle or coast
conditions up to 44 degrees is fine because there is little fuel or air being
processed and high vacuum, so burn rates are very slow. Helps prevent popping
and banging on long coast, and in the car helps keep the cat temps up, and best
of all reduces HC so you can buy one in California. For anything involving power
then 27 degrees for higher octanes and 22 to 24 for low octanes.
Lynn E. Hanover
Lynn, is there ever a need for the spark advance to go past 30?
This is a graph of a couple of the short runs I was making today. The
advance goes up to 33.2, but it went as high as the mid 40's. It is so
erratic, because it is hitting up against the rev limiter which I had set to
3600RPM. It uses a fuel cut algorithm, which is why it is so choppy.
I
need to get it running with less throttle, so I don't have to have it open
35%, then I can get a cleaner graph...but I'm just wondering if I need to beat
back that advance
first.
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