Mazda Rotary 13B Swap in a Boxster

[insite]

Originally Posted by tahleel

This is pretty eye opening. I thought the 911 was a mid-engine car just like the Boxster. I've done some reasearch, and found that there's only two shops that can do the reverse rotation. And with high demand, there's going to be high cost. It seems a lot easier and cheaper to swap in a VW transaxle, and reversing the orientation of the spin yourself.

the boxster and 911 engines spin in the same direction. the difference is in the transmission. the output shaft on a 911 transmission spins opposite that of a boxster. figure out which way the standard FC motor spins. if it's the same as the boxster / 996, then use a boxster tranny. if it's OPPOSITE a boxster / 996, use the 996 tranny. problem solved.

[tahleel]

Originally Posted by insite

the boxster and 911 engines spin in the same direction. the difference is in the transmission. the output shaft on a 911 transmission spins opposite that of a boxster. figure out which way the standard FC motor spins. if it's the same as the boxster / 996, then use a boxster tranny. if it's OPPOSITE a boxster / 996, use the 996 tranny. problem solved.

Using logic, I would use the Boxster tranny.

The 911 engine is rear engine (tranny pulling engine).
If you spin the tranny around to make it mid-engine, then the five (six?) foward gears, would be come reverse gears.
The 911 engine spins the same directions as the Boxster engine.
The 911 trans spins the opposite direction of the Boxster trans.
We need the opposite of the 911 trans (see line 1), thus needing the Boxster trans.

Even going furthur. I've read that the Boxster and 911's have similar blocks, leading to similar transmission bolt-pattern. If the Kennedy adapter plate works for the 911 transmission, it should work for the Boxster trans without a problem.

Can anyone find a fault in my logic?

-Tahleel

-Tahleel

[insite]

Originally Posted by tahleel

Can anyone find a fault in my logic?

-Tahleel

which way does a 13B spin? FYI, the bell housing on a boxster transmission is identical to that of a 996.

[tahleel]

Originally Posted by insite

which way does a 13B spin? FYI, the bell housing on a boxster transmission is identical to that of a 996.

I believe the 13B spins clockwise while looking at the flywheel. Spins counter-clockwise while looking at the pulley's.

As far as the bell housing bolt pattern, is there a difference between the watercooled and aircooled transaxles? I believe the Kennedy adapter was made for the the aircooled. I've been comparing pictures of Boxster vs 911 watercooled trans's, and they seemed different. Also, from what I remembered, it looks like the 911 has its started mounted by the rear of the trans, and has a shaft/tube running to the flywheel.

-Tahleel

[kouks]

Hey if you're going rotary lets not mess about with 13b or even 20b's. Go for the big daddy 4 rotor from the 787B. This car won the Lemans 24 hour in 1991 then was banned from racing...

http://www.youtube.com/watch?v=TgstvDmmVc0