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Date: Sun, 8 Feb 2009 10:44:11 -0800
Message-ID: <1ab24f410902081044u39bed1a6m432d7303683157d3@mail.gmail.com>
Subject: Renesis porting
From: Lynn Hanover <lehanover@gmail.com>
To: flyrotary@lancaironline.net
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FWIW, the people at Racing Beat said that the Renesis is a very different
animal than peripherial exhaust port rotaries when it comes to exhaust
systems.  As I recall, they said they got only about an 8 HP improvement
when going from stock (RX-8) exhaust system with cats & the works, to a full
race setup with headers, race mufflers, etc.  That is TINY in comparison to
the earlier engines.

 In other words, the Renesis is very non-critical when it comes to exhaust
systems.  Just keep the back pressure down and you'll do pretty well.  At
least that was my conclusion.  Note there is zero overlap in intake /
exhaust cycles in the Renesis.

BTW I'm still waiting for someone to build & test a peripheral intake port
Renesis.  I think that would be a great setup for aircraft applications.

Tracy

Another way of saying that same thing is: The Renesis exhaust ports are so
restrictive and so poorly shaped, (to avoid any overlap) and result in an
instant 90 degree turn to get out of the iron, that in stock trim a good
design exhaust system will go unnoticed. The shared center port complicates
things even more. All to keep the tree huggers happy.

One wonders what a mildly ported (intake and exhaust) Renesis could do on
the dyno. Or, in an airplane.

You would want to cut the rotors for 3MM apex seals and springs to go for
the periphery port.

Lynn E. Hanover

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<div>FWIW, the people at Racing Beat said that the Renesis is a very differ=
ent animal than peripherial exhaust port rotaries when it comes to exhaust =
systems.&nbsp; As I recall, they said they got only about an 8 HP improveme=
nt when going from stock (RX-8) exhaust system with cats &amp; the works, t=
o a full race setup with headers, race mufflers, etc.&nbsp; That is TINY in=
 comparison to the earlier engines. <br>
<br>&nbsp;In other words, the Renesis is very non-critical when it comes to=
 exhaust systems.&nbsp; Just keep the back pressure down and you&#39;ll do =
pretty well.&nbsp; At least that was my conclusion.&nbsp; Note there is zer=
o overlap in intake / exhaust cycles in the Renesis.<br>
<br>BTW I&#39;m still waiting for someone to build &amp; test a peripheral =
intake port Renesis.&nbsp; I think that would be a great setup for aircraft=
 applications.&nbsp; <br><br>Tracy<br></div>
<div>&nbsp;</div>
<div>Another way of saying that same thing is: The Renesis exhaust ports ar=
e so restrictive and so poorly shaped, (to avoid any overlap) and result in=
 an instant 90 degree turn to get out of the iron, that in stock trim a goo=
d design exhaust system will go unnoticed. The shared center port complicat=
es things even more. All to keep the tree huggers happy.</div>

<div>&nbsp;</div>
<div>One wonders what a mildly ported (intake and exhaust) Renesis could do=
 on the dyno. Or, in an airplane.</div>
<div>&nbsp;</div>
<div>You would want to cut the rotors for 3MM apex seals and springs to go =
for the periphery port. </div>
<div>&nbsp;</div>
<div>Lynn E. Hanover</div>

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