Balsaone thanks for your input as to the coil being overly dwelled i did my calculations based on 9,000 rpm which is quite possible in a dive that should figure out to about 75deg. dwell if I figured correctly >BTW i'm using the Tim-6 circuit so should'nt be sending too much voltage to coil and have never even noticed it anyting but slightly warm.Did you say you have definately ran your engines on Tim-6 circuit?Iv'e ran mine several times with varying results one time it particular it ran so well it surprised me .Later Dude