X-Mozilla-Keys:                                                                                 
Vance Jaqua wrote:

Pre heatinhg the inlet air in a heat engine is always
a lose lose proposition. It may help with vaporisation
in the case of lousy carburetion but thermodynamically
you can only gain if you add heat after compression -
as in stationary gas turbines with recuperation. With
the approach you folks seem to be proposing you would
first
of all lose power vis a vis density altitude - but
also thermal efficiency. The bsfc of the Wankel might
be improved by "Miller izing" since Mazda already is
using that license but it robs output power by
stealing intake charge to improve the expansion ratio.
Altho most engine texts relate efficiency to
compression ratio, it is really expansion ratio that
is the mechanism - in most engines they are the same -
justifying the common use - Vance

The examples out there would certainly support your claims
Vance. The Mid-West Engines aircraft rotary engine from England
is not very good on BSFC and power nor is the charged 
cooled version  from Wankel GmbH. 
http://www.avnet.co.uk./midwestengines/
http://www.wankel-rotary.com/

I was just wondering if the power loss could not be made 
up by a slightly larger engine with better BSFC?

Paul Lamar
 
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