Everyone,

I have been given the opportunity to have a 12a engine.  So, will it
work in place of a 13b ?  Normally aspirated, what horsepower will it
make ?  Will the PSRU's etc., bolt up to it ?  What should I expect or
should I look for a 13b ?  Ignition, intake, exhaust, cooling, etc. ??

Kevin

P-Port my guess is about 200 HP at 7500 RPM.
Yes the PSRU will work. All other stuff will work fine.

Paul Lamar

I flew my coot for about 350 hrs with a !2-A and was very impressed,
if I turned it about 500 rpm higher than my 13-B it preformed about
the same and I fly at gross weights up to 3200 lbs.
One thing I noticed however is that it didn't have good performance
at high altitude compared to the 13-B.
 Ken

Compression ratio has a lot to do with that. Way back in
WW I the German fighter planes had two throttles. One for low altitude
and one for high altitude. The compression ration was such that the engine
would detonated if the throttle was wide open so the low altitude throttle
had a stop on it. I also noticed it when I changed the O-470
engine in my C182 for a higher compression version.

Paul Lamar

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