Francois St-Germain wrote:

Hi group,I want to install a Mazda single rotor on

my

Mini?
It has to work at 6000 rpm cont. 70 hp.
How does it sound to you?
Frank

Very heavy Francois. The HP and durability are no
problem at all.
We need a light weight 100 HP rotary.
How about it Dr. Moller?

Paul Lamar

Do you know the weight of the single rotor no
reduction drive?
 100 lbs  is still good enough!

Not exactly. I would guess right around 135 pounds stripped bare.
A bare 13B weighs 190 pounds. It is hard to cut 90
pound by just eliminating one rotor, one rotor housing and the intermediate
housing. The front and rear housings are the heavy ones.  

Some part weights from an old message:

front housing (cast iron) 32 lbs
middle housing (cast iron) 35 lbs
rear housing (cast iron) 40 lbs
crank shaft 18 lbs.
rotors 9 to 9.5 pounds.

I think it would be well over 100 pounds unless you bought an 
aluminum back housing from Racing Beat. With the required steel main bearing 
carrier and phasing gear you might save 20 or 25 pounds. In that case you 
might get it down to near 100 pounds depending on the flywheel used. 
The 13B starter, for example is 7 pounds and a very small alternator 
is 5 pounds. This does not include the radiator, water pump, or coolant weight 
which weighs roughly 8 pounds per gallon. As far as I can tell from talking to 
people that have built Mazda one rotors, you must idle the one rotor with 
a light weight flywheel at about 1500 RPM to smooth the torque pulses.

I don't consider it a very promising engine for a mini 500.
It is hard to beat an aluminum two cycle piston engine on power
to weight ratio in this HP range.

BTW did the Mini 500 company go bankrupt? What is the current status?
 
Paul Lamar
 
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