Will the engine run "OK" with only one plug per rotor firing?  How
convenient of Mazda to include two spark plugs.

Matt Naiva

It will but the power out depends on which
plug. The top plug you may hardly notice
the lower plug you will have a significant power loss.

You need to change the old type plugs every 50 hours.
Rotaries fire twice as often per rev than
a piston engine. At a given prop RPM four times
as often as a 2500 RPM direct drive aircraft
engine. Now this is for the old style metal plugs.

The plugs in my RX8 are Iridium and we have no
data on the life of these plugs in aircraft service.
A car cruises at 3000 RPM on the freeway so it might
be half as long as the rotary. I have 30,000 miles
on the plugs I have in there now. At an avg. speed of
60 MPH that is 500 hours. However it is unlikely they
will last 25 hours in aircraft service.

I also notice they are charging a lot of money for these
plugs.

Paul Lamar