I have two projects that I am working on.

I have a Cougar/Tailwind almost done flying on a C85 now. This plane can
handle up to 150 hp. some have used IO-360's in the 200 HP range. I am
experimenting on this plane to adapt to my Bellanca Viking 260 HP.

I am very interested in the Rotary engine but know little about them. I
found a 13B RE Cosmo from an RX7 and a 13B twin turbo. Cosmo was from
JDM engines they seem to have lots of them for less than $2,000.00. The
other was $500.00 turned but no compression. Is this a big deal if it is
going to get overhauled anyway?

Are these engines aluminum or cast iron? Or is that just the 20B that is
cast?

In general what engine am I looking for for each application. I like the
idea of the Turbo compound for the Viking. That is my CC plane and I am
always at 9,000 or 10,000 feet.

Also what do I want to look for in a PSRU?

Simple would be nice for the Cougar, Turbo I think is a must for the Viking.

Is it better to go with a turboed two rotor or a asperated 3 rotor for
the Viking?

Dan

Three rotors are getting very expensive but that would be the best for the Viking.
The problem is the FAA will not approve it until Mistral gets the 300 HP 3 rotor certified
any day now. You will still need an STC which could be costly in terms of time
and paper work. All Mazda based engines are part cast iron and part aluminum.
That includes the Mistral. Never the less firewall forward weights are about the
same as cert engines with the same HP.

Any old two rotor will work for the Tailwind. The all aluminum Rotamax is nearly there.
A little more fine tuning of the PSRU gear ratio and intake porting and it should
generate well over 150 HP.

There are several reason for no compression. Worst scenario is fractured apex seals
and that probably requires new rotor housings. At best the apex seals are just stuck.
Mazdatrix does an excellent 2 rotor overhaul for about $3500 with new rotor housings.
They bench test run all their engines. For a few bucks more they will dyno it
for you.

You can also do it your self and save a couple of thou. I recommend P-port engines
which up the HP with no penalty in weight or fuel burn per HP generated.

Paul Lamar ...No rotor no motor.

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