Jerry Hey wrote:

Predictable performance is a critical part of making up a firewall
forward package for any design.    For the Tailwind,  I originally  set
the goal of 180 hp/6000 rpm with a NA 13-B.  I was told that should be
no problem.   But exactly how does one achieve that performance?
Assuming Tracy's ignition and fuel injection,  we still have the exhaust
system  and intake manifold design.   Also, there is the issue of
Street  Porting or even a mild PP if there is such a thing.  Can anyone
say that if I do the following, the HP will be............?   If the NA
rotary can deliver180 hp, then it may very well become the engine of
choice for the Tailwind.

Of course,   the recommendations have implementable.  No point in
talking about a tuned exhaust, if there is no place to put it.

  I want to go on record to the Tailwind community saying what is
possible.  I would like to provide a list of SPECIFIC  RECOMMENDATIONS
on  how to set up the engine to achieve the performance.

    Although, I have followed the debate about spinning engine faster
(and faster) to gain more hp that is not what I am talking about.   What
HP can be made at 6000 rpm?    I like this engine speed for the TW
because of the reduction ratios of Tracy's drive and  because bearing
loads are lightest at this rpm.  The Tailwind does not need more than
180hp under any circumstances.   It is a very  hot performer with an
0-320.

Jerry

Tracy has about 180 HP with long intake runners and no inserts in the
exhaust ports.

Paul, what is the purpose of the inserts in the first place?
Royce

Tracy claims they cut the noise from the exhaust 10 db.
His new Spin Tech muffler seems to be working fine so far however
with out the inserts. PL

His exhaust system is nothing special with a Y in the pipe
too close to the rotor housings. Everett said the optimum individual exhaust pipe length
is about 32 inches. Also Tracy uses the high compression rotor in a four
port turbo engine. As I recall Bruce did some mild street porting on
the side ports. Nothing earth shaking here. No one thing made much of a
difference. To get more or to be sure you are getting at least 180 and
probably over 200 at 6000 RPM go to peripheral ports like Power Sport.

Paul Lamar

 
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