This email is to address Scott Gettings wanting to know if anyone
 else has a set-up like his Renesis 6 port.  I have the same set-up
 as Scott, and I'm using only the four yellow injectors and have the
 two red ones blocked off, as per Tracy's direction.


 However Scott, I cannot get over 5900 rpm. The engine rpm does not
 increase after half throttle.  I checked to make sure the throttle
 body was opening all the way, and it is. I also removed my muffler
 and replace it with a straight pipe thinking there might be an
 restriction, not the case, made no difference in rpm.  I chopped my
 three blade 76" prop down to 68" and still no change in rpm. I'm
 also using part of the original six port intake, with no runner
 length. Now the only thing I can think of is the engine cannot get
 enough air.  Looks like I have no choice but to completely redo my
 intake or try installing a super charger to force more air in.  Not
 sure if that will work or not. I'm using Tracy's EC3, EM2, & 2.87
 PSRU.

 Bob Forbes


 The intake configuration and pipe length are critical for the HP.

 The prop runs into a brick wall when the tips get close to Mach One.
 What is your gear box ratio? Sounds like 2.2:1.   A 3.12:1 would
 work better with the rotary.

 When the prop torque requirements meets the torque out of the gear
 box the prop  and engine of course will stop increasing in RPM.

 You can move peak torque around with intake pipe length. You need
 roughly 18 to 20 inches of intake pipe length. The longer the pipe
 length the lower the torque peak RPM.

 A p-port engine will increase the max torque at any pipe lenght.

 So too will NOS :-) This is probably the cheapest and quickest.
 Makes up for a lot of intake configuration errors :-)

 A turbo charger is more economical than a super charger as it uses
 the otherwise waste energy in the exhaust to super charge the
 engine.

 Paul Lamar

 Bob please read this section of the web site.

 http://www.rotaryeng.net/intake.html

 Paul Lamar


 Thanks for Bobs output. Questions I have include what is  the prop
 pitch and the  throttle body diameter? Is this static or in-flight
 RPM? I agree the gear ratio maybe also an issue.

 I also have built a short and compact intake system (sounds like
 yours) with possible nitrous back up for take off if necessary.  I
 will test the entire engine system  mounted in an airboat prior to
 flight, which should give me some good data for this pusher
 configuration.

 Thanks!

 Scott Gettings.

 Attached are a few pictures of my short intake manifold. I certainly
 realize this may not result and anywhere near Optimal horsepower, but
 it was simple to build. The throttlebody is 2 7/8 inches inside
 diameter.   Although shorter, it is still much less restrictive than
 the stock intake manifold system. It can also receive ram air from
 the cowl intake. If this does not produce enough power in testing, I
 will convert to the over-the-top runners configuration.

Of course, this is not an endorsement of this solution compared to the longer
runners, as Paul has an incredible depth of experience in this area.

Scott Gettings

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