Jerry Hey wrote:

I have a normally aspirated 13B with Tracy's ignition and fuel
injection.  I bought it this way and have done nothing with the
engine except to work on mounting it in front of my Tailwind project.
Can someone tell me approximately how much hp this is likely to
produce?  I need a minimum of 160 hp but I would really like 175 (or
more, of course). I will be using a two to one reduction, so 6000rpm
is the absolute max the engine will ever turn.  Cruise would be
between 5000 and 5500 rpm.  What hp will the various porting schemes
deliver?  Is "street porting" difficult?  Is there someplace I can
read a full description of the process?    Thanks in advance,   Jerry

I suggest you get a copy of the Racing Beat and Mazdatrix catalogs.
Both should give you some guidelines on porting. I would guess about
180 HP or so would be available with 20 to 24 inch intake pipes
and a street side ported engine. If you need more (up to 220 HP at 6000 RPM)
you could go with a peripheral port like a Power Sport engine, build your own
or buy peripheral port housings from Racing Beat.

I also think Bruce Turrentine was working on a video of how to prepare
and port a Mazda for aircraft use.

Bruce Turrentine <BruceTurrentine@aol.com>
919 212-0671

Hans Conser wrote:

Speaking of Racing Beat peripheral port housings,  when did the price increase to $837?!!

That doesn't include the water Jacket modification either.  That is $1700 just for the rotor housings.

Hans

I think that includes new rotor housings which as I recall are around $400 each these days.
It is pretty easy to make these yourself. Maybe with just a high quality steel cutting hole
saw and a low RPM drill press.

Paul Lamar
 
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