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Thanks for the info, John
A T04 V2 is one of the two I had narrowed my
preferred choice for a turbo compressor wheel for the 13B. That is if I
ever went turbo.
High compression rotors really do not affect
airflow except in the sense you might get a bit more power and therefore rpm and
therefore airflow. But our positive displacement pump only cares about
moving the air in approx 40 cid gulps inthrough the intake and out through the
exhaust what we do to in in-between does not materially affect the air flow
(short of forced induction of some sort).
A certain Aussie gent would argue that it doesn't
matter whether you use high compression pistons/rotor or low compression, its
the combustion chamber pressure that counts. If it stays below certain
limits then no detonation, if above then "BANG!". How it gets to that
point is immaterial. While in fact many folks do use low compression
pistons if they intend on running high boost as a safety margin. However,
frequently the low compression causes the bottom end performance to suffer if
over done. The argument would go that you will get just as much power from
the same combustion chamber pressure level before combustion starts regardless
how that pressure got to that point (the engine doesn't know). So high
compression pistons would mean less boost is needed to reach that magic pressure
point.
Since less boost means less heating of the air
charge an argument could probably be made that a lower boost level with high
compression rotors might be less prone to detonation that an engine using low
compression rotors and high boost (and therefore higher inlet temps).
Humm, does this mean If I use high compression rotors and less boost that
perhaps I would not need a intercooler??
But, I would have to say that a margin for error is
somewhat more important in our case than perhaps a automobile.
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Sunday, August 22, 2004 3:18
PM
Subject: [FlyRotary] Re: Compressor
maps
>An Aussi company is making some
modifications to the stock turbo which make it much better suited for
>our aircraft needs in my opinion.
Ed,
Thanks for the
ongoing education.
Max at ATS says my
turbo is equivalent to a T04-V2 as in the attached map.
I, also, am trying
to get my head around CFM, AR and Density Altitude so I can find the
island, or at least stay on the map. :)
One thing I was
wondering - does having high compression rotors change the airflow of the
engine at a certain rpm?
John
(turbo
last seen in LA)
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