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4 stroke versus 2 stroke engines - Which is more reliable?

 
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d-m-hague(at)comcast.net
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PostPosted: Thu Mar 08, 2007 9:53 am    Post subject: 4 stroke versus 2 stroke engines - Which is more reliable? Reply with quote

At 10:31 AM 3/8/2007, John H Murphy wrote:
Quote:
--> Kolb-List message posted by: "John H Murphy" <jhm9812(at)yahoo.com>

I've heard people talk about how much more reliable 4 stroke engines are versus the 2 stroke variety. Any truth to this? I understand the Rotax 912 engines are very reliable. Why not more affordable 4 stroke engines on the market?

There are three primary reasons for the lower reliability of a 2-stroke engine, all related to the need to mix (whether premix or injected) oil with the fuel:
  • Oil fouls the spark plugs.
  • If you forget to add oil (or if the injector pump fails), the engine will seize.
  • If you set the carburetor too lean, the engine will seize.
On the plus side, 2-strokes:
  • Cost less than 4-strokes (because they have fewer moving parts).
  • Weigh less than an equivalent power 4-stroke
  • Are simpler to service (again because they have fewer moving parts).
-Dana
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jbhart(at)onlyinternet.ne
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PostPosted: Fri Mar 09, 2007 6:02 pm    Post subject: 4 stroke versus 2 stroke engines - Which is more reliable? Reply with quote

At 11:36 AM 3/9/07 -0800, you wrote:
Quote:

.................................................

Quote:
Bottom line is, when all is said and done, 2 stroke engines have many more fialures, problems, etc. than 4 strokes.


Mike

The two stroke engine can be very reliable. Many of the natural gas pumping
stations are/were powered by two stroke engines. Many of the small
municipal electrical power generation power plants were powered by two
stroke diesel engines. And currently, many of the largest container ships
are powered by two stroke diesels that are about the most efficient engines
ever designed.

I have had two two stroke engine failures and neither could be blamed on the
engine. At the time I was operating the engines outside the manufacturers
specified limits. The first was caused by carbon build up under the rings.
I did not decarbon as Rotax specified. The second was caused by overheating
the engine due to a coolant hose clamp failure.

Quote:
From the design stand point a two stroke is more reliable than a four stroke
in that there are fewer engine parts to fail. The flip side is that one has

to adjust or learn how to operate a two stroke within operational limits
that would be difficult for a four stroke to attain and produce the same
horsepower.

Jack B. Hart FF004
Winchester, IN

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