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Thread: Pratt & Whitney R-1830 Twin Wasp radial piston firing order
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Old 19th Dec 2010, 14:58
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barit1
 
Join Date: Feb 2005
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RecipMech:
R-790 7cyl. Whirlwind
R-975 9cyl Whirlwind
I believe the "R-790" is actually R-760, a.k.a. J6-7, and the R-975 is J6-9.

You could add the P&W R-1340 Wasp (their first engine, 1925) and the R-1535 Twin Wasp Jr. (a 14-cylinder derivative of the R-985).
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