Ken Powell wrote:

Chuck,
Hope you don't mind me adding my thoughts to why you don't seem to be making more HP.  It's possible that your intake pipes are too long (they look 'long' in the pictures that I have seen of your engine bay).  Seems that others here on the newsletter have suggested that 20" seemed to work best for 6000 - 6500 RPM; I plan to make my pipes in 2 pieces so that I can add /subtract to the length and can experiment with lengths between 18" and 24".  Tracy, how long is your intake from the rotor housing to the plenum?

Ken Powell
kenpowell@aristotle.net

I think that might be a good call Ken. That could also explain
why it has enough torque to power the prop past stall at 4700
engine RPM.

That silly oil filler pipe and dip stick might get in the way of 
optimum pipe length on a low cowl  aircraft installation. Perhaps 
I can come up with a new filler pipe welded into the back of the 
pan near the firewall. The dip stick can be fastened to the cap.

Paul Lamar
 
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