Don Dunbar wrote:

Hi Paul,
I started on my intake manifold today and have spent 3 hour's to get
this far.
I will cut another 1" of the cast 13B intake and the I will have 1/2"
clearance on the cowl.
Paul I used the bends that I showed you whilst you where here, as I cut
more of the cast section it moves the manifold away from the exhaust.
One of the photos show's the port side engine mount.
Regards Don

Looks like it will work great. I assume you had to squish the tubes to make them
oval. That works because you are lucky and have good clearance under the cowl. 
It is that last four inches of clearance that is the hard part. 
If you cut the stock manifold 4 inches lower the shape of the stock runners gets
really bad.  I tried that and I have some pictures.

I have set a personal design goal for the cast manifold on the height of the engine from 
thrust line to top of the intake manifold being a max of 9 inches. This will maximize the 
number of aircraft designs that can use the rotary. Airplanes with particular 
stock cowl clearance problems are RV6s, Lancairs, Kisses and Long EZs.

Paul Lamar
 
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