Dale Smith wrote:

Just thought I would tip the forum to this:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2450075294&category=33615

The gear box is dangerous as the stock shaft diameter is not up to the gyro
bending loads loads imposed by a prop. There is no way to put a large enough shaft
in the stock gear box. Also the gears themselves are marginal for continuos
high HP use. Trash the gear box.

The test stand alone is worth $500 if you need one. I am thinking
of bidding. Last thing I need in the hangar however is another test stand :)
The engine is worth probably about $1000. 12A engines are not very costly
on the used market. Only the road racers use them and that is because the
SCCA forces them to use them :)

Paul Lamar

"Burns, Mark" wrote:

My question is how much does a Mazda RX7 12-A engine weigh and how many rotors does it have?

Thanks,
Mark

My guess is within ten or twenty pounds less than a 13B. Two rotors just
like a 13B only a bit narrower. No replacement for displacement.

BTW from the looks of the stock air cleaner is has a stock four barrel carb
which is useless for aircraft use but valuable in the after market.

Paul Lamar

"Burns, Mark" wrote:

Paul;

 I don't know how much a 13B weighs. I am assuming from your answer though
that it would be too heavy for a Varieze. I don't want to exceed 240 lbs.

Thanks,
Mark

13B bare engine weight is 190 pounds. All 12A and 13B accessories weigh the same
so you are looking at around 300 pounds firewall forward. Too heavy for a Varieze.

Paul Lamar

I have a 12A sitting on the floor of my hangar. I can pick up a 13B
block, but that 12A is incredibly heavy, I can't pick it up, I have to
drag it around. I need to locate a scale and weigh the 12A and 13B
blocks to find out for sure. I think Mazda did something to the 13B to
get weight out, and it's actually lighter than a 12A.

--
Perry Mick
http://www.ductedfan.com

I think some of the 12A's had cast iron water pumps. Does yours?
I am not talking about the pump cartridge. The main part of the
pump. All the pump cartridges are cast iron up to the 3rd gen. 
The casting technology has improved over the years so the cast 
walls may be thinner on the 13B.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.