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In a message dated 11/5/2002 7:11:20 PM US Eastern Standard Time,
marv@lancaironline.net writes:
> Posted for "Martin" <wankel@telia.com>:
>
> Time 4 mister Hanover to think things trough.......;-)
>
> The 12A rotor housing is 10 mm narrower in whit than the 13B.
> 70 mm for the 12A and 80 mm for the 13B.
> (60 mm for 10A )
>
> The 12A is 1146 cc AND noting else....
> The 13B is 1308 cc .......
>
> Don't mix things up whit insurance policy on cars....or the 1.8 times you
> have to multiply the engine cc for racing, just so the UN-normal 4-bangers
> can keep up.
> We do have a 1.8 x cc rule here in Europe.
>
> Aren't automatic gearboxes only for disabled people ??
>
> And yes, the only substitute for cubic centimeters is a Rotary engine....!!
>
> Happy rotation !!
>
> /Martin
> MS 880B...ready 4 a 13B
>
Gee whiz Martin,
Read it again. I would rather see any Mazda carry on life, even with a
different
engine than go to the shredder, because I love Mazdas. So unless you build
your
engine from all new parts, (very expensive) that means that a Mazda of
some kind
bit the dust. In some cases just because the engine was removed. What
better
fate for these hulks than to be reengined with a 32 Valve Cadillac V-8 or
a small
block Chevy? Conversion kits are available for this. More Mazdas on the
road for
longer is better for us, yes?
Most sanctioning organizations (including the Sports Car Club of America)
refer to
the 12A displacement as 2292 CCs and the 13B as 2600 CCs. The rational is
that
to compare the rotary engine to a conventional 4 stroke you must rotate
the crank
through 720 degrees of rotation. This is to allow all of the cylinders of
a 4 stroke to
cycle. If you do that to a rotary, what do you get? The data plate on the
12A
powered cars says that the engine displaces 1147 CCs I suspect that this
is
rounded off a bit to get a whole number. Otherwise the answer is 2294
CCs. So
for the sake of determining what cars the Mazda has to compete against,
the
engine is 2292 CCs. Or 2600 CCs for the 13B powered cars.
In comparing the 12A and 13B the comment "there is no substitute for
cubic
inches, or CCs" refers to the larger displacement 13B having the
potential for
making more power. This is a general truism and is not really true. The
heavier
rotors and longer crank of the 13B limit maximum RPM to less than 9,500.
The 12A can go to 10,000 RPM. This with unlightened rotors in both cases.
If you add the super lite rotors maybe 9,700 for the 13B and 10,700 for
the 12A.
You have to turn it faster but you can equal the power of a 13B.
This data is of no value for the aircraft installation. But just for
Oshkosh a turbo
13B with lite rotors could put on one heck of an airshow. For the long
haul, the
engines will be turning between 5,000 and 6,500 RPM. In this RPM range,
the
13B is king.
The 13B rotor housing is about 1/2 inch wider than the 12A. And so
it is,
Just About.
Being old and wise (I think) the automatic trans is such a cool idea
that young
guys miss it every time. The rear end gears in a Mazda look like toys.
The rotary
has little torque just off idle (notice the 45 pound flywheels) and can
barely get the
car rolling. With a big V-8 up front, you would need a spare diff in the
trunk to get
anywhere. The less obvious problem is your wife will not stand for this
new toy
unless she can drive it too. Years ago a stranger rang my doorbell. He
had a new
Fiat Brava with under 100 miles on it sitting in my driveway. He also had
a trunk
full of racing parts he wanted installed on his new car. His wife waited
in another
fiat (white 72 Sport Coupe). I did the whole 9 yards (an aircraft term).
Wild cams,
dual 42 DCNFs headers, lite flywheel, MSD ignition, adjustable cam
pulleys etc. It
was on hell of a fun car to drive fast. Well, in a straight line anyway.
It was not at
all fun for his wife to drive, and she was stuck away from home a couple
of times
with fouled plugs (even with the MSD). So we backed off on the cam choice
and
the car became a delight to drive. He is now the CEO of Collier-Seeley
corp. in
Los Angeles, and still has a Fiat sport.
So with a V-8 and an automatic trans you could have one real nice
car. You
could eat BMWs with it. Your wife would love it, and the original rear
end would
last forever. And you could used the rotary engine in your airplane.
My friend Tom Pomeroy has no right arm and no feet. He is also two time
national
champion in formula continental, using the same manual trans as everybody
else
in the class. He drove my Lola Can Am car one time and I had to weld a
washer
to a nut and jam nut that onto the top of the shift lever. He would stick
his hook
through the washer and wrap a heavy rubber band around it to keep his
hook from
jumping out. He can out drive me and everybody else he competes against.
He is
also the most incredible mechanic you ever saw. He is a computer whiz and
does 3D cad for a living. He and his wife as a team won the Chrysler
national
trouble shooting competition while in high school. (best mechanics in the
USA).
So relatively speaking, it is I who is disabled.
Lynn E. Hanover
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