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  Dual-Engine: Counter-Rotating Vs Non-Counter-Rotating

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Author Topic:   Dual-Engine: Counter-Rotating Vs Non-Counter-Rotating
JimU posted 05-21-2004 05:26 PM ET (US)   Profile for JimU   Send Email to JimU  
Opinions please on using two right-hand engines versus counter-rotating (CR) engines in dual application on an Outrage 25. The 20-inch engines with CR are impossible to find. Whaler recommends using two non-CR engines with 20-inch shafts rather than CR engines with 25-inch shafts. Appreciate any experienced opinions. Thanks JIM
LHG posted 05-21-2004 06:26 PM ET (US)     Profile for LHG    
I have noticed that almost all late model Commercial 22 & 25's are done with 30" transoms, for twin 25" CR engines.

I can't imagine why BW would recommend the non CR 20's, except for the reason that they're not thinking about jack plate use, or don't like them structurally. However, the 1988 catalog shows a 25 Outrage with twin 150 20-inch Mercs mounted on jack-plate brackets.

Admittedly, the 25's for the first 6 years were only powered by non-CR 20's, so many got along with this solution just fine. The advent of CR engine, in about 1986 or 1987, is what brought about the innovation of Whaler Drive.

I do know that Mercury, at least, has a CR conversion kit for 20" V-6's, dealer installed. Don't know the upcharge, but I would guess about $1000.

If you are going to go with the non-CR engines, be sure to see JimH's article in the reference section on setting up the Hydraulic steering in side mount version, reversed, and with cylinder between the engines to counter prop torque

Ector posted 05-21-2004 06:37 PM ET (US)     Profile for Ector  Send Email to Ector     
I just bought 25-inch shaft Counter-rotating 150-HP Optimax. I am going to mount them by a 5-inch jackplate set. :)
Ector
Plotman posted 05-21-2004 07:16 PM ET (US)     Profile for Plotman  Send Email to Plotman     
My new 22-foot has a pair of 25-inch engines mounted to fixed height 5-inch jack plates--essentially a pair of aluminum "U" channel. I can email a picture of the setup if you like. I believe West Marine sells them for $85 a pair (1 pair per engine).

David

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