I forgot to mention the Bell is 3:1.

     The Allison version will be in the same ball park.

     BTW rumour has it the new RXx will be 3.2 litres equivalent so at
     the same level of tune as the current 13B  TTC engine we are looking
     at 800 HP for a two rotor. It is all aluminium stock as well.


     Paul Lamar


    Paul, you might look at the gear set from a NP241 transfer case, it's very beefy and it doesn't have a lot of crap attached to it. Ratio is 2.72:1.

    Everett Rankin

    How much torque is it good for?

    Paul Lamar

 Torque rating should be high as it is multiplied by the transmission
 gears in first or second gear prior to getting applied to the
 transfer case. Allison planetary ratios  are 3.59, 3.69 and one is
 4.7. These are designed for use in medium and heavy duty trucks,
 buses and construction equipment so they are designed for high torque
 diesel engines and lots of abuse. The parts are readily available
 which says they are fairly affordable. The advantage to using the
 higher ratios is that higher engine RPM for takeoff can be used or
 lower prop RPM to reduce drag or noise.

 Dale Davies

Dale, what are the part numbers for the Allison 3.59? I am thinking
of designing a GB for a 3 rotor turbo Reno racer.

Paul Lamar


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