Paul,
I dug up some more info on the OMC - Outboard Marine Corp. Wankel engine
that I am selling at:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=270041360366
The Research Group at OMC built many different Wankel engines including a
50cc single rotor, 825cc single rotor, 1300cc double rotor marine engine,
the 528cc snowmobile engine and a four rotor 2120cc-360HP racing outboard.
The only engine that was placed into production was the air-cooled
snowmobile engine. Fifteen thousand (15,000) of these engines were built
from 1972 through 1974. During the same period OMC built 1.5 million
two-stroke engines.
It looks like they developed 35 to 45 HP depending on carburetion ?
at about 5,500 rpm.
Their four-rotor was showcased on the front cover of the June 1973 Mechanix
Illustrated.
Here is a pic of the four rotor and the single rotor OMC wankels
http://www.der-wankelmotor.de/Motoren/OMC/omc.html
Here is a NASA tech article from the Lewis Research Center dated 1987:
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19870010849_1987010849.pdf
"The d i r e c t - i n j e c t i o n s t r a t l f i e d - c h a r g e
(DISC) Wankel r o t a r y engine i s
c u r r e n t l y being evaluated by NASA as a f u t u r e advanced
powerplant f o r l i g h t
commercial and s i m i l a r a p p l i c a t i o n s ."
Very interesting test of a 648cc DISC (Direct Injection Strafified Charge)
OMC engine running on ASlM diesel check f u e l w i t h a cetane number of
53.7.
Air cooled rotor, normally aspirated and unthrottled.
Single spark plug, single injector.
Looks like the engine was water cooled.
Compression ratio 12.94: 1 !!!
Paul, I am confused. Was this test a "computer simulation" or did they
actually test an engine ??
They have a pic of an actual engine but then I kept reading about
simulations ???
I see some fuel consumption graphs on page 22, but I can't relate them to
the figures you already posted for the LeMans engine.
Looks like volumetric efficiency approached 125%. Nice.
I did a search for "Wankel" at
http://ntrs.nasa.gov/search.jsp and found
33 papers !
A student named Kenno from Zenica, Bosna i Hercegovina posted a nice list of
Wankel engines at:
http://www.pungas.com/forum/Svi-Wankel-motori-t-3721.html
All for now.
Have to get back to work on that POS FORD.
Bruce Toski
---------------------------------------------------------
Thanks for the links Bruce. The NASA study is indeed a computer
simulation and an engine was checked only to verify the simulation
and only at very low RPM. Near useless for our purposes and
for the Wankel in general as it is a high RPM engine.
The second and third charts indicates the computer model was out
to lunch as there is little correlation with actual HP, EGT, VE
and BSFC. Garbage in garbage out.
I'll have to convert G/Kw BSFC into pounds per HP
BSFC but it is going to be bad.
It appears the OMC engine is a charge cooled rotor and charge
cooled rotaries are notoriously bad for BMC and power per
cubic inch.
NASA is famous for paper studies.
They sponsored a computer simulation on the turbo
compound rotary with very positive predictions of fuel
consumption and power but never built or tested any hardware.
I have a whole collection of these sorts of paper studies.
The people that pass out the money at NASA apparently no
nothing about anything. However we learn from failures.
Paul Lamar ...No rotor no motor.
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