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

Brett & Tiana wrote:

Thanks for this info, Paul. And you weren't kidding, this is definitely more
involved than I'd anticipated.
I've printed copies and will see if I can find more info on V6 engines, but
since I only have 8 minutes to complete the presentation I may have to pick
an alternative to go along with the other 14 items on my list of criteria.
I still have another week before it's due so maybe I can come up with
something to tie it together.
Thanks again,
Brett.

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