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Author Topic:   Mercury 225 EFI vs 225 4- Stroke
Plotman posted 07-18-2003 01:42 PM ET (US)   Profile for Plotman   Send Email to Plotman  
As I look to repower a 22' OR, I'm intrigued by the idea of one of the big 4 strokes.

How significant a difference in performance am I likely to notice between these two engines at the top end and coming out of the hole?

And do you see the same kind of dramatic improvement in fuel economy in the large engines that you do in the small?

What about relaibility - is there enough experience on the 4-stroke in this size to make a judgement?

All of my experience with 4 strokes has been on smaller fishing boats with Hondas, where I love them, but I'm very up in the air on a bigger boat.

Bigshot posted 07-18-2003 01:55 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
If comparing a non-optimax type then the fuel consumption will be about 25-40% less at cruise. WOT you will probably lose about 2-3mph. Holeshot slower but same holeshot whether 1 erson or 5 aboard. We had 8 adults in my my buds 23 Seacraft with twin zuki 115's and she got on plane easily. His old 130 yamaha 2 strokes would have really struggled. Light losd though the 130's had quicker holeshot.
lhg posted 07-18-2003 03:28 PM ET (US)     Profile for lhg    
I recently saw, and photographed, a brand new 22 Guardian dive boat, with 30" transom, with the Mercury 225 4-stroke on it. The engine looks absolutely HUGE on a 22, so much so that I did not like it. I simply would not have a 22 with a beast like that on the back.

Locate a current 2003 Mercury catalog, and you will see their comparison of the 4-stroke with the 225 Optimax. The 4-stroke gets slightly better fuel economy, but otherwise doesn't measure up very well. Acceleration is half what the Optimax accomplishes, and top end is slower. The EFI I believe is an even better performer, but less fuel efficient. Hands down, if the startup smoke doesn't bother you, I would get the EFI, 225 or 250.

If you want to put a "screaming machine" on the boat, with great fuel economy, consider the 250XS Optimax from the performance division.

Plotman posted 07-18-2003 04:15 PM ET (US)     Profile for Plotman  Send Email to Plotman     
lhg - looking cool is of prime importance - well pretty high.

How much difference is there in fuel economy between the different flavors of 2 stroke?

Peter posted 07-19-2003 07:28 AM ET (US)     Profile for Peter  Send Email to Peter     
Fuel consumption needs to be compared at the same boat speeds where each motor is performing the same amount of work.

See the following thread for a discussion of fuel consumption of a Yamaha 225 EFI 2-stroke versus a 225 4-stroke. . Assuming the Pursuit data reported therein is accurate, the fuel economy of the 4-stroke isn't what you might be led to believe.

In my view, the significant difference between the 2-stroke and the 4-stroke is quieter and substantially smokeless operation at trolling. If you do a lot of trolling and don't want to use a kicker, then the 4-stroke might be a good choice although you will give up a little top end speed. As far as saving money through increased fuel economy of a big 4-stroke -- forget about it. Even if there is some, it will take nearly a lifetime to recapture the cost of the extra investment in the 4-stroke.

Clark Roberts posted 07-19-2003 01:59 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
As to quietness, I find that the four strokes make more noise at wide open throttle (and near WOT) than an EFI two stroke ... V6 Merc. I have a 115 hp four stroker that makes no noise at idle but at near WOT is noiser than my 90hp two stroke. Now the four stroker is not very noisy it's just that the two strokes are very quiet at mid-range and WOT. If you want to experience superior performance and super quiet operation just check out (test drive is only way to judge) and wring out a 2.5 liter V6 EFI Merc ... then decide for yourself and you may not agree with me but it won't be first time... Yamaha V6 EFI two strokers may be same? Now, I love my 115 four stroker and it does a fine job and I'm considering a 60hp EFI four stroker for my Montauk (currently running a 50hp two stroke). As to the size and weight of the 200-225 four stroker... not for me. If I needed that much hp I would go for a 250 hp EFI two stroker and not have a second thought about it (Preferably a Merc but a Yamaha would serve). I've been the DFI route and like the performance and fuel economy but don't like all the belts, compressors, hoses etc and the diesel sound at idle. Also the premium $ for new DFI/four strokers is so much more than EFI 2 strokers that even if they got twice the mileage of a 2 stroker you won't live long enough to make up the difference in fuel savings (and maint savings... what does a valve job cost for a overhead cam V6 four stroker??? sooner or later someone will find out!). Above are just my opinionated ramblings and there is an engine out there for most everyone... which one... ???? With so much $ at stake, take a test drive before forking over the cashola... That's my story and I'm sticking to it... Happy Whalin'... Clark.. Spruce Creek Navy
lhg posted 07-21-2003 02:28 PM ET (US)     Profile for lhg    
Agree with Clark. My own experience with the Mercury 2.5 liter V-6 EFI's is that they are super quiet at speed, quiter than the Optimax also. No coffee grinder sound either. I will hate to see them take that engine out of production.
Fishcop posted 07-23-2003 03:01 AM ET (US)     Profile for Fishcop  Send Email to Fishcop     

I have a single 225 Optimax on my 1987 25' Outrage. Smoke free, relatively quiet and tons of power. Pushes my boat 40+ MPH.
Fuel economy and oil consumption are better than the two strokes and in my experience, better than the four strokes of the same HP.
To qualify that statement, I run a Honda 225 four stroke on a 27' RHI (Rigid Hull Inflatable) work boat. Not even close in power or performance. The RHI is lighter than my Whaler but the Honda is outperformed by the Optimax, hands down.
At high RPMS, the Honda is loud compared to the Optimax.

For the money, the Optimax or EFI is the way to go.
Plan on spending the $20 a gallon for the Optimax oil, better safe than sorry.

Best of luck,


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