when doing this modification don't you have to put two plugs in BOTH

holes? Mazda quotes the

ignition function as lose trailing plug lose 25% power, lose LEADING

plug lose 75% power. This

would be per rotor of course. Not using both ignition positions will

cause a loss of power

reguardless of the type of ignition used. Please enlighten me if I am

missing something here.

Otherwise the post sounds a little bs. Bill Jepson

I don't understand what you man by:
"put two plugs in BOTH holes"

One of the reasons it is down on power with just the trailing
plug is the hole is so small the spark from that plug fails
to ignite the mixture from time to time.

I think this is a reasonable thing to do. Dennis Hayes is
quite honest and forthcoming IMHO. Why would he lie about something
like this anyway.

Paul Lamar

I don't think Dennis is anything but straight forward.  However, the one
thing he does not appear to address is that the stock ignition timing has
the trailing plug "trailing" the leading plug by approx 15Deg in ignition
timing.  With that set up you will definitely notice it when the leading
spark plug goes south.  If, however, you are using Tracy Crook's ignition
set up,  the trailing spark plug is set to ignite the fuel mixture at nearly
(within nanoseconds) of the leading spark.  This makes a big difference.  In
fact, when you switch the leading spark plug off (as you can with Tracy's
set up) you barely notice any difference in rpm (maybe a 50-75 rpm drop).
You can easily fly, take off and land on the power available with the
trailing sparkplug PROVIDED you change the timing to coincide with the
leading spark plug.

In summary, there is no need to enlarge the hole for the trailing spark plug
to maintain power on just the trailing spark.  Use Tracy's ignition system
and you have the ability to get home with just the trailing spark plug
without any problem.  Its interesting that this apparently did not get
considred by Hayes in his project.

Ed Anderson

 
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