<<  Since the rotary is capable of running very lean it is apparently
 > > very important to have a good ignition system.
 > > Here is a chart from Klause Savior's LSE forum at the Golden State
 > > flyin.

The Chrysler lean burn ignition from the 70s was just a MSD in a

Chrysler

box. I use two MSD 6ALs with built in rev limiter. With the plugs gapped

at

.012" we have no problems, too rich or too lean makes no difference.

Don't

let one of these bite you. It will lay you out in the grass for a while.

You

can weld the latch shut on your metal watch band.
Lynn E Hanover

BTW Klause also mentioned that a longer gap has a higher probability
of finding a fuel molecule to ignite. He recommended a .016 gap
for an aircraft piston engine.

Paul Lamar

Tracy Crook wrote:

I'm confused.  In my experience, even .016 is an anemic gap.  Check out the
gap on a stock Mazda rotary plug (not adjustable).  It's something like
.040" - .050".

BTW, The coil energy on the stock Mazda coils is very good, and being an
inductive system, the spark duration is very long which is what you want
under lean conditions.  CD systems have a very short duration.  MSD
(multiple spark discharge) has to make many sparks to make up for this
shortcoming.  It also eats a ton of electrical power which may be of
interest to those concerned about battery life in the event of alternator
failure.

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

I thought the rise time of the CD was important for punching
through plug contamination. At least that is what they told us.

snips..

Don't read this if you just want to fly :-)

Here is a chart from Heinz Heisler Advanced Engine Tech on the 
abilty of the CD to fire a partially fouled plug.

BTW I would love to buy motor mounts and all the other parts
Norm mentioned off the shelf for a rotary and my Kis Cruiser. You can 
always buy a Power Sport firewall forward package if you don't
care to do it your self.

Paul Lamar

 
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