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  Sport 11 with a 25 HP Force

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Author Topic:   Sport 11 with a 25 HP Force
rbruce posted 11-16-2003 06:10 PM ET (US)   Profile for rbruce   Send Email to rbruce  
Dear Whaler Classic enthusiasts:

I have a 1986 11' Sport Console boat with a 1969 Chrysler 20 HP that I use for fishing and sightseeing. I rebuilt this classic boat to her original beauty and put in a motor that my father had but never used for more than 30 hours and which is still in very good shape and looks.

Lately, I found a 1986 Force 25 HP and I am considering upgrading the engine of my Whaler 11 Sport. The newer motor is 92 lbs. vs 74 lbs. for my older Chrysler. Both are two stroke engines but the newer motor has three cylinders and 26 cu.in displacement versus two cylinders and 19.96 cu.in. displacement for the 1969 Chrysler. The incremental weight and power is my main concern! The 1969 Chrysler came with a 8 1/2" D X 8 1/2" P propeller and it has been clocked to 20 mph at wide open throttle. The newer 1996 Force 25 has a 10 3/8" D X 13" P propeller it will probably propell the boat at close to 25 mph.

In 1986 when my 11 Sport was manufactured motors where starting to get heavy with the advent of 4 stroke technology in small outboards, but a 1981 Chrysler 20 HP had 468 cc vs 422 cc for this Force Motor, and was 115 lbs heavy, heavier than this Force 25. These motors have the same propeller the 1981 Chrysler came with a 10 3/8" D x 12 1/2" P propeller.

My question is that my 1986 11' Sport Console boat was rated for 20 HP maximum. Will going to an 5 HP increase be risking life and limb and damaging the transom?

I look forward for your input!

Regards,

Robert H. Bruce

David Jenkins posted 11-16-2003 06:23 PM ET (US)     Profile for David Jenkins  Send Email to David Jenkins     
I have had a 25 hp Evinrude 2-stroke motor on my 1978 11' for about 10 years and have never had any problems. It is just the right amount of power for the boat. It feels very safe to me.
rbruce posted 11-16-2003 09:53 PM ET (US)     Profile for rbruce  Send Email to rbruce     
David:

Check the story of my boat trip to Nicaragua at: http://homepage.mac.com/rbruce63/PhotoAlbum2.html

Graphite file sharing. It is in PDF format so it will not tax your internet communication.

Regards,

Robert

Bigshot posted 11-17-2003 11:50 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I would not own either a Force or a Chryslet(same thing) but you may want to try a different prop on your current engine.
rbruce posted 11-24-2003 07:58 PM ET (US)     Profile for rbruce  Send Email to rbruce     
Big Shot:

I will measure rpms soon to find if my 8 1/2" Diameter X 8 1/2" Pitch propeller is fine or overrevving. During the trip to Nicaragua the motor seemed way too loud...but I have not measured RPM's.

Do you think that overpowering to 25 HP would be too much?

rbruce

Bigshot posted 11-25-2003 01:20 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
No...11' Whalers are harder to plane etc than a 13 due to shortness. The 15 is a wimpy engine being a punched out 9.9. The 20 or 25 OMC or Merc, etc are usually a bigger bore and much more of an engine per say. Again, I would NOT go with a Force, look for a nice engine to repower with. If going new, the Tohatsu/Nissan 18hp is a great engine with some grunt.
rbruce posted 11-29-2003 03:30 PM ET (US)     Profile for rbruce  Send Email to rbruce     
Big Shot:

Would you consider a Honda 20 HP with two cylinders and one carburetor and 101 lbs. or a Honda 25 HP with three cylinder, three carburetors, positive pressure lubrication but 145 lbs.?

Or is it better to stick to two stroke motors of which the Johnson 25 has the largest engine displacement of them all including Mercury?

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