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  50 2 stroke or 40 4 stroke on 13 dauntless?

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Author Topic:   50 2 stroke or 40 4 stroke on 13 dauntless?
PJB posted 09-25-2001 04:51 PM ET (US)   Profile for PJB   Send Email to PJB  
Hello fellow whaler owners. I have enjoyed this site for almost a year now, but had no reason to post until now. I own a 97 13 dauntless w/a 50 merc. my question is this, I would like to go to a 40 4 stroke for the obvious reasons, clean running, quiet and better fuel milage. How much top speed will Ilose, on a good day the boat will go 42.5 at 5250 rpm's this is w/a 4 blade stainless trophy sport p/n 48-878616 14p. Please give me some pros and cons on this swap, also will I be able to use above prop or will I need to drop to a 12 or a 13p. Thank you, and God Bless America.
jimh posted 09-27-2001 11:37 PM ET (US)     Profile for jimh  Send Email to jimh     
First, I know why you are curious about being able to re-use that 4-blade Trophy Sport prop: I priced one and almost fainted!

If your 1997 Merc 2-stroke 50-HP is running, you probably will have a hard time making an economic justification about buying a new 4-stoke 40-HP engine to replace it. The savings in fuel consumption would take a long time to pay back.

But then it is hard to make any economic justification for owning a boat at all, so what the heck--if you want a new engine, get one!

You may loose some speed, but I would guess that in a 13-foot boat there are not that many ocassions when the conditions are right for running it at 42 MPH, anyway.

Anchor7 posted 09-28-2001 02:28 PM ET (US)     Profile for Anchor7  Send Email to Anchor7     
I owned a 13 Dauntless with a 40 hp 2-stroke Evinrude, and, although I don't have speed figures for you, I really think it could have used a 50. Even disregarding top speed, I thought acceleration was sluggish. If I were spending the money to repower, I would not get a 40, and since you already know how a 50 performs, I think you will be disappointed.
B Bear posted 09-28-2001 04:48 PM ET (US)     Profile for B Bear  Send Email to B Bear     
I have come to the conclusion that when powering a boat that one should get the maximum rated HP for that hull.

In the long run this will allow you to have the largest midrange possible, the best performance possible when fully loaded regardless if you never go WOT.

I fully believe LHG's comment on this," I've heard a lot of people complain that they could have used more HP than they purchased.
But nobody ever says they have TOO MUCH HP.
Underpowering is the biggest mistake people make with outboard boats. Then you're stuck with your decision for ten years or so."

I would, and have, gone to a less HP engine in a 4 stroke because of the benefits of a 4 stroke engine and with it's weight limitation. Which is economy, quietness, no need for oil to be added to the fuel, emissions, and still had satisfactory performance.

As time passes 4 stroke engines are getting more powerful and lighter. You have quite a few choices and next year there may be more. It is possible to find a 50 HP 4 stroke that will work on your 13 Dauntless, that would be the way to go. This something you will have to make a call on. Good Luck.

Bear

PJB posted 09-29-2001 07:41 PM ET (US)     Profile for PJB  Send Email to PJB     
Thank you very much for your input.

I think I will keep my 50 2 stroke.

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