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Author Topic:   Counter-rotating prop
k2163 posted 03-16-2004 03:26 PM ET (US)   Profile for k2163   Send Email to k2163  
Has anyone tried a counter-rotating prop on their whaler?

I have a 1985 18' Outrage.

A buddy of mine said his dad had one on his boat and loved it?

I have a 140 V4 Johnson on the back.

Any comments or ideas would be greatly appreciated.

Thanks,

Ken

Buckda posted 03-16-2004 05:28 PM ET (US)     Profile for Buckda  Send Email to Buckda     
K -

You need a counter-rotating engine for a CR prop.

They're (CR Props) more expensive and harder to find / replace in the field.

CR prop will not work on your motor as it has a normally rotating gear in the lower unit.

Your friend's dad must have bought a CR motor for his boat.

Dave

WSTEFFENS posted 03-16-2004 06:39 PM ET (US)     Profile for WSTEFFENS  Send Email to WSTEFFENS     
K:

Counter rotation is done in the gear case of your engine. It was not available in V4 applications just V6 engines with the larger lower unit. All OMC engines (of that era) turn the same way.
Best
WLS

Mumbo Jumbo posted 03-16-2004 08:17 PM ET (US)     Profile for Mumbo Jumbo  Send Email to Mumbo Jumbo     
You need to do a search on this issue. There are some good threads which address the issue.

Good luck.

Sal DiMercurio posted 03-16-2004 10:13 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Ken, I think someone is jerking your chain.
If you put a counter rotator prop on a normal right hand turning engine, your forward gear is now reverse & your reveres is now forward.
If you notice, reverse throttle is only about 1/3 - 1/2 of normal throttle maximum.
So the outcome of using reverse as forward gives you about 2500 - 3000 rpms maximum.
It dosen't work unless the engine it'self is a counter rotator.
Sal

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