O/B motors 2 stroke vs. 4 cycle - Page 3 - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #21  
Old 09-11-2006
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The two-cycle engine is much simpler, and lighter. Indeed, you will smile broadly when you open it up to see what's inside. In it's simplest form, the prime mover will have 3 working parts.... plus the gearbox, if it has one.

The two cycle will use more fuel than the four cycle.. about 1/2 as much again, particularly when worked hard. A two cycle outboard, like the motorcycles, realy drink heavily when thrashed.

If you are not going far, I would stick with the two cycle, certainly for use with your tender.

If you are going far, and not in a hurry, the four cycle is where it's at.
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Old 09-11-2006
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You are right about fuel economy with a two stroke. It treats gasoline like someone drinking water from a free flowing garden hose.
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Old 09-11-2006
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From a motorcycle... the now discontinued GT 500A Suzuki, a two cycle twin.

My own one will manage, when nursed, 53 miles per galllon (Imperial). I have done that one a few times.

From an old road test, back in 1976, when thrashed.... wait for it..... 19 miles per gallon, Imperial. I have never tried that one.

Thats 2.78 as a ratio, or 35% of the distance per gallon when thrashed.

Two cycles really are not economical when thrashed.
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