Twin engines but not counter rotating

[JiMindy]

I have twin Mercury 90 on a 21 ft center console with both engines spinning the same direction. Is it possible to change one to counter rotating? What are the pros and cons? Can i change one prop and run that engine in reverse? Crazy...

 

[cribber]

Re: Twin engines but not counter rotating

I'm not sure if you can change the rotation of a drive unit but suspect the gearing would need to be swapped to reverse the rotation. The use of counter rotating twin engine setups is to eliminate/reduce torque steer. Here is an Iboat like to prop info:
http://www.iboats.com/basics/propeller_basics.html