Dwell time as a %

[Sean Connelly]

Can someone help me... I am trying to work outthe ignition coil dwell time
expressed as a % for various engine combinations but I am getting confused.

I know the time for one engine rev (in ms), coil dwell time (in ms) and
number of cylinders (1, 2, 3 or 4) so how do I get dwell time ?

Is it 

    Dwell(%) = (Dwell Time / (Time for 1 engine Rev / # Cylinders)) * 100


Sorry its such a trivial problem, but the easy ones are sometimes too 
easy and you miss them completely.

Cheers

Sean Connelly.