Thanks scalerobotics,

Thats great info. Its funny that you mention C-H ignition. I actually know the guy that owns the company and this is for some ignitions he is working on. The
lookup table I am using now advances the timing to 28 degrees around 2500. That is too soon. It really needs to be after 4000 rpm. So with the formula( (12 * rpm + 200)/1000) is this used to figure the delay? Thanks for your help.