Brett & Tiana wrote:

Hi All,
I'm presently training for my AME licence (A&P to you guys  south of the 49th parallel), and one of the tasks I've been assigned is a "Relative Merits"
report. The subject I've chosen is auto conversions, and I'm to compare three options and then recommend one of them.
The three options are the Mazda 13B, the Subaru EJ22 and the Chevy 4.3L V6. Of course, the rotary wins this battle hands down, with the V6 coming in a distant
third if at all.
I've researched this topic to death over the last 8 years so it's an easy topic for me, but I'm required to back this up with actual figures. One set of
figures that I'm having trouble locating is vibration levels. I know the rotary is way smoother than the two recips (which are way smoother than any
Lycosaurus I've ever flown behind) because I've owned four RX7s.
But does anybody have access to an actual chart depicting vibration levels in specific units for at least the rotary but preferrably all three?
Any info would be very much appreciated.
Thanks in advance,

Brett Campbell.

This is what I have but it is a very complicated subject. I can recommend a couple of books.
The 90 degree V6 is such a nightmare balance wise that it is not even considered in these
books.

* For those of you with an engineering degree or equivalent Taylor's 
series of books is the best there is. The bible of engine design. 

The Internal Combustion Engine in Theory and Practice.

Volume 1: Thermodynamics, Fluid Flow, Performance. Second Edition 
Revised. 

Volume 2: Combustion, Fuels, Materials, Design. Revised. Charles 
Fayette Taylor. The MIT Press Cambridge Massachusetts, and London 
England. 


*Advanced engine technology by Heinz Heisler. Published by
the SAE in 1995. An up to date treatment of the latest technology
as applied to the piston engine.

* V-6 BUICK FORD & CHEVY 90 deg./60 deg. Performance. by Pat Ganahl 
CARTECH 1988 ISBN 0-931472-13-X $18.95 I normally don't recommend
books of this genre as they do not have the detailed and factual 
engineering information such as BSFC, stress and heat rejection 
information necessary to successfully adapt and auto engine to 
aircraft use. What this book does, in it's introduction and 
crankshaft chapters, is discuss the myriad compromises that led to 
the 90 degree V6 auto engine. 

Paul Lamar
 
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