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Author Topic:   110 SPORT Re-power with 25-HP
Nautigal posted 02-15-2015 11:59 AM ET (US)   Profile for Nautigal   Send Email to Nautigal  
I have a 110 SPORT with a Mercury 25. The boat is rated for 25-HP, but I would like to put on an E-TEC 30. The two [areas of performance] I am trying to improve are trouble getting up on plane with four passengers and as well as vibration in the console when at idle. The E-TEC being a two-cycle engine with power on each stroke should run smoother at low speed. Any thoughts?


jimh posted 02-16-2015 08:28 AM ET (US)     Profile for jimh  Send Email to jimh     
The E-TEC 30-HP is an 863-cc displacement in-line two-cylinder. I don't think even the most die-hard fan of the E-TEC would suggest that any two-cylinder two-cycle is going to be the smoothest, most vibration-free engine in the world. I don't have any first-hand experience with this engine, but based on the 90-HP three-cylinder, which is using three cylinder of the same size as this 30-HP, the engine should have plenty of power, as it is making just 15-HP per cylinder compared with the 30-HP per cylinder of the 90-HP model.
tedious posted 02-17-2015 09:00 AM ET (US)     Profile for tedious  Send Email to tedious     
Nauti, the first thought would be to make sure you're OK with your insurance company, both for any boat insurance you carry, and even more importantly, for personal liability. You'd hate to have a mishap and not be covered.

On the vibration side, it's hard to say whether the eTec will help - it probably will, but may vibrate at other speeds, as vibrations like the one you describe are usually caused by resonance. You may also want to make sure nothing is loose on the console, or even install a damping product such as Dynamat to the inside panels of the console.


jcdawg83 posted 02-17-2015 02:27 PM ET (US)     Profile for jcdawg83    
I think if you want to carry four passengers, you should consider a bigger boat. Stepping up to even a 13' Whaler would give you much more room and be much more comfortable.
Jefecinco posted 02-17-2015 05:56 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
I don't want four adults on my Sport 13. I've had three aboard and that was enough. Three adults can almost barely fish on the 13 if they are very friendly and considerate. For three adults cruising is about all that can be done in any comfort.

I would get a 15 if I would be regularly hosting three passengers.


jimh posted 02-19-2015 08:39 AM ET (US)     Profile for jimh  Send Email to jimh     
I overlooked the 11-foot boat in the discussion. It seems quite unreasonable to expect to go about on plane in an 11-foot boat with four adult passengers, unless one were operating in the most protected water.

I think you'll take a bath on the economics of re-powering. A better investment would be a larger boat.

dg22 posted 02-20-2015 09:49 AM ET (US)     Profile for dg22  Send Email to dg22     
I find two medium sized adults and two kids on board is about maximum with my 13-footer. I also think the weight of the E-TEC 30 would be on the heavy side for a 11-footer. And I don't think there would be much difference in performance factoring the extra stern weight. One thought is to get a lower pitch propeller for your Mercury 25, if you typically have more passengers on board.
macfam posted 02-21-2015 09:18 AM ET (US)     Profile for macfam  Send Email to macfam     
Being an owner of an E-TEC 30 hp, I would not recommend it for an 11' Whaler based on weight. Too much for the 11, pretty well tolerated by the 13.
As far as vibration-free and smoothness: In my opinion, remarkable.
Very quiet and smooth at idle, and virtually vibration-free at harbor speed.

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