Reply To: 3 engines

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I understand there are 2 approaches to twin engine design.

1. Drive the rear wheels with engine (a) and the front wheels with engine (b)

2. Use both engines’ output to drive a common gearbox

How the hell does option 1 work, is it totally reliant on electronic engine management? Seem to remember a split gearshift on a Tiger Seven replica which allowed each engine to be gearchanged separately but there must be more to it than that.