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


Supposedly 5500 lb-ft, like I said, it's beefy;)



http://www.genuinegmparts.com/pdf/powertrain/GM%20Parts%20Remanufactured%20Transfer%20Case%20Specification%20Chart.pdf



Everett Rankin


I doubt that. I think you mean 550 ft pounds. The ratio is too low
for rotary use. We need 3;1 minimum.

The Ford is good for 650 ft pounds and is used in the power stroke
diesel. It is also 3.12 to one.

Paul Lamar




Nope, it's 5555 lb-ft according to specs and I doubt they're wrong because most other transfer cases are rated in the thousands too. There are other transfer cases with deeper gear ratios that might work better, this is just one I'm familiar with.
 Everett Rankin

Is that for some sort of large truck? It is too heavy at 75 to 100 pounds.

Paul Lamar

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