the trigger pulse repetition maximum of about 250ms is a build in
feature in the MSD unit. M&W does not have it, that is why it works. It
certainly has nothing to do with battery voltage.

Richard Sohn

I don't understand what you mean about this.
"pulse repetition maximum of about 250ms"

Did you mean 2.50 ms??

If you did I don't think that is right because the rotary
racers are turning up to 11,500 before shifting with MSD.
systems. Lynn Hanover raced his rotary for years at 9300 RPM


133.3 revs per minute. 2.22 revs per second  at 8000 RPM.
There are a thousand ms in each second.
That is one rev in 2,222. ms. That is a long time in a micro computer.

Check my arithmetic.

This is with a 3:1 gear box. Most aircraft people won't turn the engine
that fast.

The MSD 6 is a real old design. Great improvements in switching transistors
have been made in the last few years so it is now possible to build
a system with better specs. Better even than the M&W. Check out the
Mallory CD.

Here is a 3 rotor on the RB dyno with six MSD's

For years it was the standard ignition for rotaries.


Paul Lamar

That arithmetic would get you an F-. 8K rpm is 133 rps or 1 rev in 7.5mS


On Sunday, August 20, 2017 3:55 PM, paul lamar <rotaryeng@earthlink.net> wrote:

Robert LeClercq

Paul,

Yes I see where I made the mistake.
8000 per minute is 133.rev per second and then divide  that into 1000.
= 7.51 ms

Thanks Robert.

Paul Lamar

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