Quote:
Originally Posted by JRMichler
I believe that most of the difference goes away if the timing is advanced when running on single plugs. Longer flame travel distance on single ignition needs more spark advance.
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That's what I was thinking. An aircraft engine twin plug setup doesn't need as much advance because each flame front has a shorter distance to travel.
Never had any success with Bosch +4s. I run Champion copper cores in my truck. I could run iridiums, but only to extend plug change intervals...