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Thanks for the feedback Lynn. Unusual to see a "poor
port design" actually aid performance.
Mike Wills
Sent: Sunday, June 20, 2010 9:59 AM
Subject: [FlyRotary] 13B Rotary engines.
Lynn,
Please expand a little on your comment, "Converting a
Renesis would seem to deliver the best of both worlds". It would seem that the
side exhaust ports in the Renesis would be potentially a significant breathing
handicap and that the PP exhaust of the 13B would be a better choice. Maybe the
benefits of no overlap outweigh the breathing handicap?
Mike Wills
The massive overlap of the early rotor housing with a periphery exhaust
port, and a periphery intake port really works in the favor of power from maybe
7,000 RPM on up. These engines make more power right up to their mechanical
limits, above 11,000 RPM.
Below that or at lower RPM, say 5,000 to 6,500 it is merely annoying.
It is a loss of fuel right out the exhaust. Higher EGTs. Overly sensitive
to exhuast back pressure. And a poor idle.
The poor exhaust port shape of the Renesis helps minimize the effects of
the overlap that is manufacture when the periphery port is installed. The port
area is adequate for performance because there are two such ports for each
housing.
Lynn E. Hanover
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