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  35HP or 40HP for Sport 13

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Author Topic:   35HP or 40HP for Sport 13
larpad posted 08-02-2004 10:47 AM ET (US)   Profile for larpad   Send Email to larpad  
I have a 1971 Sport 13 with a 15" transom. I added CMC 5" vertical extensions to accept long shaft motors since I had a hard time finding a good short shaf. I tested a 35HP Evinrude and could only get it to 26MPH. I am now looking at a 40HP Mercury. What MPH should I expect and with the added weight of the 40HP, will it harm the transom.

Any suggestions on how to improve the performance would be much appreciated.

uberhahn posted 08-02-2004 12:09 PM ET (US)     Profile for uberhahn  Send Email to uberhahn     
My 13 footer also has a 15" cutout. Similar setup as you've outlined. I've got a 40hp evinrude. top speed with two adults is rougly 32mph (gps) on calm water. I wouldn't want to go any faster.

I'm not sure what if any weight difference there may be. With the 40, it sits stern-low, but acceptable. I did have to install an aftermarket set of "fins" on the cavitation plates of the engine to help with the planing.


BOB KEMMLER JR posted 08-02-2004 05:12 PM ET (US)     Profile for BOB KEMMLER JR    
are you looking at a new merc 40 with t&t?if so,that thing will sit very low.i put a new 40 nissan on the back of our old 13 and thats 80 lbs lighter than the merc.i have to be careful coming off plane or water will rush in over the back.i'm sure another 80 lbs would make it even more sensitive to that.I get about 32-38mph gps with myself,two coolers,2 gas tanks,tackle box and anchor.I'm sure that merc would be a bit faster,the new 40's are all 4 cyl,but that means more fuel consumption too.
2manyboats posted 08-02-2004 06:30 PM ET (US)     Profile for 2manyboats  Send Email to 2manyboats     
I don't think you will see much difference between a 35 and a 40 . Here are some numbers I came up with comparing a 40 to a 25
BOB KEMMLER JR posted 08-03-2004 12:34 PM ET (US)     Profile for BOB KEMMLER JR    
that merc 40,is probably closer to a 50.I think you'd definately see a difference between the omc 35 and merc 40 in real life.

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