I was looking at a 20B P-port originally for my
 project.  But since the 20B engines are getting harder
 to come by and Mazda has started discontinuing parts for the
 older engines, I have turned my eye to the renesis as an
 option for future availability of parts.  I know the
 renesis is a whole new ballgame in terms of porting from the
 earlier engines.  What porting is being done with the
 renesis, and what is the reliable hp that you would expect
 to get?
 Thank you,
 David Case
 -------------------------------------------------------
 I don't recommend porting. I recommend P-ports.
 They are easier to build manifolds for and easier to
 predict
 the power out. In general 25% more than the best porting.
 Over all cost is lower. 250 HP for a 2 rotor and 375 HP
 for a 3 rotor.

 Paul Lamar

The only example of a working renesis engine install in an aircraft I could
find was Tracy Crook's.  He seems to be using a chopped version of the stock
intake system.  His info is fairly sketchy and since there have not been any
updates in a few years it looks like he has abandoned the project for a 20B
install he is currently doing on another RV.  His web site was offering a
service to cut down the stock renesis intake for cowl clearance but that is
suspended.
If I am understanding you, your recommendation is to p-port the renesis
intake, build a custom intake just like any other rotary, I assume use the
slide throttle configuration?
What about the exhaust?  Just leave the exhaust ports like they are?
Thank you

David Case.

This airplane is also flying with an RX8 engine.
http://www.youtube.com/watch?v=XgLw3a8DZgM
There may be others.

We have had an RX8 engine on the dyno with a p-port and it makes over 250 HP
with the stock exhaust ports.

Tracy's plane has the lower power RX8 (four port) engine with too short IMHO
intakes runners. He estimates the power at 200 HP.

Paul Lamar

Tracy hasn't abandoned the 20B. Its in the air and flying.

Bob Mears.

Yes he has two rotary powered airplanes. One RX8 RV4 and one 20B RV8.
He did not fly the 20B to Sun n Fun as it had some "issues"
as we say in Hollyweird :)


Paul Lamar