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Old 09 May 2009, 02:45   #1
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2 stroke vs 4 stroke

On my quest for knowledge again, sorry , On engines fuel injected 80 hp > 150 hp are 2 stroke or 4 strokes most favoured ?
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Old 09 May 2009, 02:49   #2
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On my quest for knowledge again, sorry , On engines fuel injected 80 hp > 150 hp are 2 stroke or 4 strokes most favoured ?
Oh boy. Here we go...
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Old 09 May 2009, 03:53   #3
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On my quest for knowledge again, sorry , On engines fuel injected 80 hp > 150 hp are 2 stroke or 4 strokes most favoured ?
No-one can tell you that without a long argument. Try both.Make your own mind up.
Generally in the sub 115hp bracket there's a significant power/weight advantage in having a 2 stroke.

Depends what you prefer-loads of grunt plus some noise (it varies) or a bit less out of the hole, bit more weight but near as dammit silent.
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Old 09 May 2009, 04:11   #4
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Would a four stroke be more reliable?

I speak with the benefit of profound ignorance. However garden machinery and motorcycles seem to be more reliable machines when they're 4.

Probably different with boats.
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Old 09 May 2009, 04:32   #5
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Not really...

It's a hard question-nothing is 100% reliable, and most failures/problems on leisure use engines are down to salt water exposure,long periods of inactivity and poor maintenance. 2 strokes do wear out faster than 4 strokes, but when a leisure use 2 stroke can last 20+ years before it's physically worn out, the comparison is irrelevant as by that time corrosion damage or neglect will be causing far more problems.

Marine 2 strokes certainly don't suffer problems in the same scales as 2 stroke bike engines do-they rev far lower and are far heavier duty build quality.If they broke down a lot they simply wouldn't sell.
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Old 09 May 2009, 04:34   #6
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From what limited information I have, hence the thread

2 strokes are lighter, modern ones have similar fuel consumption and fuel injection is preferred to Carbs.

Iwas hoping to have this either confirmed or ny theroy blown out of the water we will see
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Old 09 May 2009, 04:45   #7
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Originally Posted by jetski View Post
From what limited information I have, hence the thread

2 strokes are lighter, modern ones have similar fuel consumption and fuel injection is preferred to Carbs.

Iwas hoping to have this either confirmed or ny theroy blown out of the water we will see
That's about the size of it-apart from the noise issue. 4 strokes are quieter-despite Evinrude's claims about Etecs-and 2 strokes have a lot more grunt from a standing start.
Personally, I rather like the noise of an engine behind me.

You do have to look at the weights in comparison though. Due to manufacturers using the same engine blocks to produce different HP, some 2 strokes don't have the weight advantage. Optimax 90s for example are pretty much the same weight as 90 4 strokes.

It's the same as anything else. Everything has an exception and it's always worth looking twice at everything.
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Old 09 May 2009, 05:44   #8
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Just as Nos says, try them and make your decision. It's what is better for YOU that matters!

My etec suits me and my boat down to the ground and I like the face that it is noisier than a four stroke! You wouldn't want a sports car that sounds like a micra would you...
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Old 09 May 2009, 06:01   #9
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Do you need to consider the 4 stroke paying for itself or not. The fact 4 strokes are cheaper to run attracts some people.
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Old 09 May 2009, 06:32   #10
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Do you need to consider the 4 stroke paying for itself or not. The fact 4 strokes are cheaper to run attracts some people.
Optis, Etecs etc don't have any real significant cost increase any more to run than 4 strokes once you add on the extra servicing costs of a 4 stroke.
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