O.S. .18 CVR-MX Reverse rotation?

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dschigoda

Well-Known Member
Joined
Jul 31, 2006
Messages
247
Is it possible to reverse the rotation of an O.S. .18 CVR-MX engine? :huh:

I'm thinking I would need a different crankshaft. Does anyone know if such a crankshaft exists? If so, where could I get one? I suppose I would also have to somehow "reverse" the pull starter too.

Thanks.

Dave
 
You are correct on both counts. The crank needs the induction timing reversed, and the pull starter will be to be removed as it cannot be reversed. The engine will then need a standard back plate. The crank will likely have to be custom made. But, why would you want to do such a thing. Reverse rotation props are harder to come by.

Is it possible to reverse the rotation of an O.S. .18 CVR-MX engine? :huh:
I'm thinking I would need a different crankshaft. Does anyone know if such a crankshaft exists? If so, where could I get one? I suppose I would also have to somehow "reverse" the pull starter too.

Thanks.

Dave
 
You are correct on both counts. The crank needs the induction timing reversed, and the pull starter will be to be removed as it cannot be reversed. The engine will then need a standard back plate. The crank will likely have to be custom made. But, why would you want to do such a thing. Reverse rotation props are harder to come by. "

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Hmmmmmm. I was hoping that O.S. actually produced these crankshafts.

Why? Well I was looking at this website http://www.classicthunder.org/ It shows a group of guys that run 1/10 scale unlimited hydros - running a counter clockwise course! If you are used to watching full size hydroplanes, it looks much more realistic. They can do it easily because they are using electric motors and piano wire drive shafts. Sure, the prop selection is limited, but from looking at their video clips - they seem to do just fine.

I was thinking about building a "fun" (non-competion) 1/12 scale (30 inch) unlimited hydro with a reverse rotation .18 (or whatever size I can get) marine engine. The reverse rotation would be needed to help bring the back end of the boat around when turning left (like the real ones). An electric motor could be a solution - but I really like the sound of a nitro engine.

Now that I think of it... I think K & B used to make a reverse crankshaft for their .21 Marine (back in the '80's).

Dave

Dave
 
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