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"I am thinking about replacing the LASAR system on my IO-540 with a
Plasma III system from Lightspeed. I noted on the Web site that the magnet
placement is different for 8.5 compression engines than for "higher" compression
engines. Since mine has experimental 10 compression pistons, I was wondering if
there was a problem. Also, I am running relatively low temperature plugs (37)
which I understand is required because of the high compression. Is there a
problem with the combination of high compression and the hotter spark in the
Plasma III system? Love to hear from anyone who is running high compression
pistons and any kind of electronic ignition system.Halle, John"
John, I'm not sure of your question. However, the
best timing slightly retards as compression ration is increased. At least this
is true on some engines. The octane requirement increases as compression ratio
is increased. So if you are worried about detonation then you would retard the
timing. Some people become so worried about detonation they eliminate the
benefits of higher compression ratio by over retarding the timing. There is not
a problem using an ignition system with more spark energy. As a matter of fact,
the required spark energy goes up as compression ratio is increased. The
required spark energy also goes up with boost.
Craig Berland
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