ORIGINAL: DMOne
Ok i get it thanks for that pic as i sat and thought about were you were measuring from the light bulb finally went on and the numbers are more acurate. Still not sure of the trig stuff and how to use excel but i might try the timming wheel instead any thoughts?
It is only maths...who is excel?
The timing wheel can give you opening and closing point in relation to the piston, a simple calculation from that will tell you duration.