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Ol' Ron · 05-01-2020, 12:00 AM

The AF and timing is not important at idle. Tune for cruse first, then power, and let the idle take care of it's self
Having a sysstem like this will alow you to experiment with the cruise performance,. Richard was getting well over 15 AF but had to run the advance to far ahead. With the computer you can just pick a number and see how it runs. JWL made a set of heads with a relocated spark plug to place the plug in the center of the transfer arel. This allowed for a power timplug and a much shorter flame front. You should also consider milling the heads for .045/050 Piston to head clearance. THis created a Quench around the piston which creates a turbulent combustion chamber. WE do that to all our engines. I envy you, wwish I had mine working????

05-01-2020, 12:00 AM	#14
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Optimal ignition timing curve? The AF and timing is not important at idle. Tune for cruse first, then power, and let the idle take care of it's self Having a sysstem like this will alow you to experiment with the cruise performance,. Richard was getting well over 15 AF but had to run the advance to far ahead. With the computer you can just pick a number and see how it runs. JWL made a set of heads with a relocated spark plug to place the plug in the center of the transfer arel. This allowed for a power timplug and a much shorter flame front. You should also consider milling the heads for .045/050 Piston to head clearance. THis created a Quench around the piston which creates a turbulent combustion chamber. WE do that to all our engines. I envy you, wwish I had mine working????