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Long distance two stroke - what goes wrong?
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[QUOTE="Rich Rohrich, post: 1154571, member: 16241"] At some point it comes down to piston crown cooling. A 250 two-stroke piston crown sees 9000 firing cycles per minute at a sustained 9000 rpm. A four-stroke engine running that same rpm sees only 4500 firing cycles, along with 4500 cycles where the crown is essentially allowed to cool. This difference impacts a host of other things in the engine including piston expansion, piston to wall lubrication, cooling system efficiency, detonation and pre-ignition tolerance, etc. While there are certainly other differences between the two and advantages to both styles of engines, in that type of environment piston crown cooling is the one issue that no one has found a good solution to over the long haul. The guys running KX500s did an amazing job of working around these difficult issues, and they deserved their place at the top all those years. Hard work and lots of broken engines paid off. :cool: [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Long distance two stroke - what goes wrong?
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