[QUOTE=Creaking Door;1757479]Sorry, with you now; you meant the Griffon crankshaft is different from the Merlin, not a different arrangement of throws. (And thanks for taking the trouble to post the drawings).

No, I meant the arrangement of the throws!
Have another look at the drawings.

The direction of rotation doesn`t determine the arrangement of the crankshaft, or the counterweights necessarily. The Rover Meteor uses the same crankshaft as a Merlin but rotates the opposite way.

Pete