Dear Paul

While searching Fleabay for something to buy, I saw a 12A engine with dual
distributors and a 4-barrel carby for sale. I have never seen a rotary with 2
independent distributors, and am seriously considering buying the engine,
specifically because of this (potential) dual ignition system. Do you know these
engines? It would make a nice little p-port with a dizzy per rotor, and a Holly carb
with leaning block and turbo.

Erik in Oz.

As I recall my 1973 12A RX2 had twin distributors. Maybe early RX3 also. It was easy
for Mazda to do that as an off the shelf piston engine distributor would work. Only
the rotor caps were different. Similar to my rational of using one megasquirt per
rotor. The twin distributor front cover will probaly bolt on a 13B. With modern
electronics no distributor is necessary. You can trigger off the front pulley or the
ring gear.


Nice collectors item if you are restoring an RX2. Only about 120 HP. Not a good power
to weight ratio by todays standards. Not a good aircraft engine as Mazda made some
significant improvements in materials in 1989.

Paul Lamar

I don`t think this engine is going to sell, so I plan on offering the owner $300 for
it. I am only looking for around 120 hp. anyway so the plan is to p-port it and add a
carb with a turbo for 140 take-off hp. I am too stupid for fancy electronics, anyway.
Most of the megasquirt discussion you have going at the moment is way over my head. I
like the 2-distributor redundancy and the carby reliability. At least I know how they
work...:>)

If nothing else, I will have a working 120 hp. p-port engine for not too much money.
Would I still find parts for this engine?

Erik in Oz.


Rotor housings might be a problem as I think Mazda quit making 12A parts quite some
time ago. Rotor housing are high pressure die castings and very technically
sophisticated and not easy to make. The wear surfaces are chrome plated hard steel.

Regards,

Erik in Oz.

Paul,

This is a silly question, but I have to ask: When sitting in the cockpit with the
engine installed, but WITHOUT any reduction apparatus, which way does the propeller
turn? Clock-wise?

Erik in Oz.

Yes. A 2.85 GB goes in the same direction. A 2.17 GB goes counter clock wise.

Paul Lamar
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