Mazdatrix built this 350 HP turbo two rotor RX8 engine with
three exhaust ports per rotor. Both side and peripheral exhaust
ports are used. That power is generated at only 8000 RPM.
The waste gate opens at that point. The pressure in
the combustion 1.3 L chambers (there are two of course. Total
displacement is 2.6 L or 158 ci) are rather high. Well over 2 HP
per cubic inch so the stock 8 mm tension bolts are increase
to a 1/2 inch diameter. These act like 17 dowel pins holding
the expansion of the aluminum rotor housing. If you don't do this
the cast iron end housings can crack around the top dowel
pins.

This engine is irrelevant to most aircraft use unless you
want to race at Reno. The fuel burn would be enormous at around
30 gallons an hour and you would have to have a low drag high
speed airplane  to get reasonable mpg. Of course you could use
the power for short takeoff in an STOL aircraft.

Mazdatrix  have plenty of genuine Mazda 3rd gen RX8 coils
in stock. Mazda part number N3H1-18-100B-9U. A bit more
expensive than the RX8 after market versions.

They are also selling the GM LS2 coils with a mounting
bracket for RX8 engines and a 5 MS dwell. In racing applications
they are going to 10,000 RPM and above but only for a
fraction of a second and then it is time to shift.
Then it happens again. In drag racing it is all
over in ten seconds or less. In road racing
I suspect most rotary guys are still using CD MSD's.

They use Haltech EFI's and one can set the desired dwell
in that device. The Haltech seems to be the EFI of
choice in rotary racing.

This duty cycles is typical of automotive use
so the inductive coils don't get a chance to over
heat so much.

In that regard the LS2 with heat sink seems to
be more durable. It takes 5 ms to fully charge
the LS2. At 8000 RPM the coil duty cycle is 62.5%.
This is far higher than the duty cycle you will find
in a truck as the coils fire every other revolution.
The amount of heat and current the coil needs
is a direct function of this duty cycle.

In theory the RX8 coil should be designed
for this duty cycles as it fires every revolution
but only occasionally. Most of the time you
are cruising down the freeway at 3000 RPM.
The RX8 coil is fully charged in 2.6 ms because
it has lower primary inductance. However the max pulse
current is higher.

In aircraft use the coil duty cycle is higher
than a car duty cycle so a heat sink should be used
with RX8 coils.

How many people are planning on using RX8 coils?

I am thinking of building a heat sink for RX8 coils.

Paul Lamar