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Author Topic:   Performanceof twin 150 on 25 outrage
JimU posted 07-22-2002 12:10 PM ET (US)   Profile for JimU   Send Email to JimU  
Any experience with performance of twin 150's on 25 outrage? Other power options? Relative merits of counterrotating versus non-CR engines? what is Optimal for 25 hull? thanks JIM
dfmcintyre posted 07-22-2002 01:43 PM ET (US)     Profile for dfmcintyre  Send Email to dfmcintyre     
What model Outrage?

You might want to contact Walt Steffins at

He's had an early 90's 25' W/T with twin 150 Evinrudes for some time now.


lhg posted 07-22-2002 02:25 PM ET (US)     Profile for lhg    
Unless you're talking about a Whaler Drive model, twin 150's were just about the only power ever used on the 25 Outrage/Revenge models. There is not one picture in ANY Whaler catalog that shows anything but twin 140's (those old OMC large block 4's) or 150's on them.

Some dealers did set them up with big singles, mostly for pricing considerations.

If the hull is in good shape, with a smooth bottom, a stong pair of modern 150's should give you 50mph. Don't even think about not getting counter-rotation in this day and age. The prop torque and lean will be considerable from the 4 3/4" hub props. But herein lies the problem. The hull was designed for twin 20" engines, now an obsolete condition. All manufacturers only make CR engines in 25" length without special costly modifications at the dealership. So transom brackets need to be installed for a modern twin engine CR installation.

JimU posted 07-22-2002 04:06 PM ET (US)     Profile for JimU  Send Email to JimU     
Thanks for the replies. Another question: Some local area dealers are advertising leftover 150 yam 2-strokes, probably 20 inch models, on sale for under $6000. Although I haven't researched them throughly, What kind of price premium whould I exspect for counter-rotating engines? Is it possible to modify one of the engines to rotate the other way?
lhg posted 07-22-2002 04:19 PM ET (US)     Profile for lhg    
Bought new, a 25" CR engine is only about $225 more than the other engine, and that is not because of the engine expense, but usually the tiebar that comes in the package.

I have no idea what a CR conversion on a 20" shaft Yamaha would cost, but I have seen a few done on Mercs, so it could be possible.
I can't imagine that replacing a whole lower unit would be cheap.

I'd stay with 25" shafts. You can also a get static 1/2" lift plates from CMC for less than $100/engine to accomplish this installation with no setback. The higher powerhead mounting is also a benefit.

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