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Old 12-25-2005, 06:21 PM
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Default 4 Stroke Outboard Life vs. 2 Stroke

I know that the difference between 4 and 2 stroke engines has greatly narrowed with regards to fuel economy and noise level. However, I do not know how they compare with regards to how long each will last without needing to be replaced or rebuilt.

How many hours can one expect to get out of each type of engine, provided the proper maintanance is done? I would expect that the 4 stroke would have a longer life, but I am interested in hearing from someone more knowlegable than me.

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Old 12-25-2005, 08:12 PM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

The new etec has a soild skirt piston similar to a 4str so it should in theroy last longer
But a 4str should easily get 3500hrs whereas 2500 hrs is considered above average for a 2 str
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Old 12-26-2005, 10:22 AM
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Default RE: 4 Stroke Outboard Life vs. 2 Stroke

Thanks for the information. If anyone else has an opinion on this, I would love to hear it.

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Old 12-26-2005, 10:34 AM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

I believe the four stroke should last longer also. It has a dedicated oiling system to keep the internals lubricated in a more efficient manner. Better lubrication equals less wear.

Also, if a four stroke outboard has plain bearings similar to an auto four stroke it should have more longevity than a two stroke which typically has roller bearings.

I don't know what kind of cooling system the four stroke outboard has. If it is like an auto four stroke where the temperature is held to a tighter tolerance I think that would enhance its life. Two stroke engine temperatures are all over the place, going from high to low to high and back again.

Just an opinion however as I have a two stroke. My next will be a four stroke.

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Old 12-26-2005, 10:59 AM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

I think the real question is - how much is it going to cost for a new 4S powerhead compared to a 2S - given the higher initial cost and most certain higher cost to replace/rebuid, I'm not convinced there is an advantage..guess we'll find out soon enough once the 1st round of the new 4s's start comming in for repair..will be interesting to see..
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Old 12-26-2005, 11:24 AM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

I tend to disagree on the lubrication issue. The two cycle has excellent lubrication in the combustion chamber as oil is on the inner and outer side of the chamber. If you examine an old outboard engine, you will very seldom find any wear in the cylinders, unless it overheated, of course. The roller bearings are cooled and lubricated with fresh, clean, cool oil/gas mixture. Two cycle engines have fewer moving parts and are very easy and inexpensive to overhaul thus extending the engine life expectancy.

What I have seen with outboard engines is that they are more susceptible to aging rather than hours of operation. I have seen fishermen that use their outboards on a daily basis and keep their engines for many years, with thousands of hours on them. On the other hand, you might find 10 year old engines that are unreliable and beat up with just a few hundred hours. Lack of use and corrosion are worse than lots of use with adequate maintenance
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Old 12-26-2005, 11:41 AM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

The new 2strokes out from both companys do not have oil in the gas anymore. They have an excellent oil lub system and less moving parts. That said, I don't think enough time or evidence exists yet to get a good read on how long both the 2s and 4s will last in real life conditions.
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Old 12-26-2005, 11:47 AM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

What about a timing belt/chain failure on a 4 stroke? On some automobile engines, if the timing belt breaks, the pistons slam into the open valves. Not all of them are like that however. But if a 4 stroke outboard power head was one of those types in which a piston would slam into the valves if the timing belt/chain were to break, then that might be something to think about when comparing a 2 stroke to 4 stroke in terms of potential longevity.

Also, have the 4 stroke boat motorsbeen around long enough to make an equal comparision?
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Old 12-26-2005, 12:47 PM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

QUOTE from FOURDFISH: (The new 2strokes out from both companys do not have oil in the gas anymore. They have an excellent oil lub system and less moving parts. That said, I don't think enough time or evidence exists yet to get a good read on how long both the 2s and 4s will last in real life conditions.)

You are correct. I was thinking about the older 2 cycles.
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Old 12-26-2005, 01:59 PM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

Got 3000+ hours on my Yamaha fourstroke engines vs 1000 on the 2 strokes on my commercially used Parker. 4 strokes still running fine with a few minor repairs involving filters and belts. On my old 2 strokes anything over 1000hrs was the time to cross my fingers till I could finish the season and trade in. Fuel economy a bit better one or two gallons and no extra cost for 2 cycle oil. As far as performance same speed and planing time as the 2 strokes. I don't notice any differece pushing 4000# of load. Spend the little extra on the 4s and get a much longer life span as far as I can tell.
Works for me anyway.
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Old 12-26-2005, 02:29 PM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

The Yamaha F200, F225 and F250 have non interference valves so hitting the piston is not a problem...
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Old 12-26-2005, 03:44 PM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

Quote:
ono loco - 12/26/2005 11:59 AM

I think the real question is - how much is it going to cost for a new 4S powerhead compared to a 2S - given the higher initial cost and most certain higher cost to replace/rebuid, I'm not convinced there is an advantage..guess we'll find out soon enough once the 1st round of the new 4s's start comming in for repair..will be interesting to see..
Yamaha and suzuki currently has a six year warranty on their 4 strokes. You should be able to get your moneys worth in six years.
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Old 12-26-2005, 04:44 PM
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Default RE: 4 Stroke Outboard Life vs. 2 Stroke

2 stroke is a simple design and the oil mixture is for the max amount oil needed at full throttle so you will always have lubrication the only reason why 4's are showing up is because how dirty traditional 2's are they tell you they save up to 40% in gas well thats true near full throttle but not at idle speeds you dont see it that drastic 4 strokes are heavier too

DO THE 2 stroke while you still can
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Old 12-26-2005, 05:57 PM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

Quote:
mtcfish - 12/26/2005 3:29 PM The Yamaha F200, F225 and F250 have non interference valves so hitting the piston is not a problem...
"non-interference" that's the term I was trying to think of (but couldn't remember). And I'm glad to hear the F225 is designed that way.
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Old 12-26-2005, 07:51 PM
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Default RE: 4 Stroke Outboard Life vs. 2 Stroke

Unbroken,

I think you have it backwards. The Fxs do much better at the slower speeds. The economy of the 2xs approaches that of the fours near WOT...and only then.
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Old 12-26-2005, 08:17 PM
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Default RE: 4 Stroke Outboard Life vs. 2 Stroke

All of the new engine 2 or 4 stroke will last longer than you will want them.average boater runs his boat 50 to 100 hrs per year that means ten to twenty years for most people.how long will you own or want to own your engine before repowering.if your engine last 2000 or 3500 hrs chances are you want own it past 500 to 750 hrs.
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Old 12-26-2005, 08:32 PM
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Default RE: 4 Stroke Outboard Life vs. 2 Stroke

The fact that manufactures give longer warranty for four strokes should tell you something.
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Old 12-26-2005, 09:45 PM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

"The fact that manufactures give longer warranty for four strokes should tell you something."

Early optis and fichts had longer warranties!
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Old 12-26-2005, 09:56 PM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

As for warrantys all the new E-TECs come with a 7yr extended warranty right now! Like SCAngler said most won't own thier engines/boats that long! I sold my last engine with 1850hrs on it and it still ran well!
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Old 12-26-2005, 10:06 PM
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Default Re: 4 Stroke Outboard Life vs. 2 Stroke

Bigbone-- Check out the performance reports, You will find that both the Optis and E-TECs both have the best economy at idle and trolling because they idle at about 500rpms or so and only burn .3 gal/hr and those rpms.
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