| Joe,
This intake is designed for use on several engine, ie 4 port and 6 port. So the mounting plate is a compromise for the different engines. You will probably be able to gain some more rpm by addressing the joint between the engine and manifold. Take a piece of paper and trace you ports from the engine, cut out the openings on the paper. Then lay the paper on the manifold over the openings and you will see where it needs attention. Make a metal plate the same as the paper tracing, cover the surface with something nonstick, then bolt it on the manifold. Use JB Weld to form the manifold to a more pleasing flow pattern. Remove the plate once hardened, and try on the engine. I am sure you will see a big difference in RPM.
Bob
On Oct 9, 2006, at 12:40 PM, Joe Hull wrote: Oh, let me backup a minute. While the engine was down – waiting for the new exhaust I decided to re-do my intake manifold. I have the short Atkins manifold and had a plenum attached directly to the TWM throttle body – with nice sharp edges butting up to the throttle body (hey I didn’t know!). So I created some 11” long intake tubes that flare to a “sort-of” bell mouth inside my air-cleaner plenum. I tested that briefly with the old muffler and on the ground got another 100-150 RPM static and another 200-300 RPM in the air – up to 5400RPM and another 3-5kts airspeed (162kts). So that was a win. Regards, Joe Hull Cozy Mk-IV N31CZ (65 hrs - Rotary 13B NA) Redmond (Seattle), Washington
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