Paul Lamar wrote:

Another check on my numbers. 6000 RPM. 6000/60 seconds is 100

revs per second.

Yep.

1/100 rev per sec is .01 seconds or 10 milliseconds per rev.

Yep.

Yep you are right Tracy as you very well should be since you deal

with

this kind of stuff on a daily basis :-)>

10 ms is 10,000 usec.

Yep.

10,000 / 360 degrees is 370 usec per degree of e-shaft rotation.

Nope.  10,000/360 = 27.777777....  So roughly 28 usec / deg.

So a 200 usec long CDI pulse from the John Clarke system
would consume only .54 degree rotation of the e-shaft.

Nope.  a 200 usec pulse would cover roughly 7 degrees of rotation.

Three to four times firing the MSD ign system would appear to be

beneficial at 6000

RPM.

Only if you wanted to cover 30+ degrees of the stroke.

Russell Kent

You could halve the capacitor and halve the charging time with half
the
pulse width and fire it more often for the same total energy.

Or you could lower the on resistance of the FET and reduce the
output impedance of the power supply to charge the capacitor faster.

Sorry about the quality of this schematic but the original was
pretty bad. If anybody wants to build this let me know and I will
send the complete pdf file to you. Too big to publish.

Paul Lamar

Hey Paul,

Also, do you know of the best source for the coils used with the CDI
systems?  I've seen the Light Speed ones that are nice and small and
weigh only 5 oz each, but they are dual-tapped (i.e. lost spark).  I
don't want to use the lost-spark method since I'm trying to make
measurements using the ionization current and the extra spark plug on
the exhaust stroke would invalidate the measurements on the power
cylinder.

Thanks,

Eric Holmberg

I think GM sells the Nippon Denso for the LS1 V8 used in the Corvette
and other cars.

Paul Lamar
 
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