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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