Light twins not using contra-rotating propellers

In article ,
TheSeaHawkatwowwayd0tcom says...



What would be all the unique parts?

Camshaft has to be different.
Crankshaft probably is drilled differently for the oil passages.
Starter.
Oil pump.
Magnetos.
Vacuum pump, I assume?
Prop, obviously.

That should be about it?



That is interesting.
I think nevertheless it is not so much the number of parts variables, but
the fact that dual-inventory has to be established through the entire
supply and QC chain, all to support an infinitessimal minority that makes
it a poor choice. Or, let's say an infrequently adopted choice.

As stated above, the only performance difference is the elimination of
the concept of the "critical" engine. We are not talking about something
as radical as centerline thrust, which introduces net, single-engine
performance gains compared with off-center mounts.

GF