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Old 02-23-2014, 05:14 PM
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Dudesky Dudesky is offline
Non Compos Mentis
Join Date: Dec 2011
Location: Mar a Lago Estate
Posts: 27,071
Originally Posted by spdrun View Post
I'm confused -- there are 4-stroke engines that use pre-mix? Wouldn't those have the disadvantages of both 4-stroke and 2-stroke?
Conventional 4 stroke is going to have oil in the engine crankcase no mixing.

Found this on Stihl site.....never heard of it...pretty cool:

The award-winning STIHL four-stroke engine that runs on a petrol-oil mix. The STIHL 4-MIX engine thus combines the advantages of a 2-stroke and a 4-stroke. As well has having plenty of lugging power and perceptibly higher torque, the 4-MIX engine is also convincing in terms of lower emissions, low maintenance and a pleasant sound.
Clear advantages

  • Fewer emissions: The fuel burns with very little in the way of residues and thus complies with the strict European exhaust emission limits, Stage II.
  • No oil servicing: Easy maintenance, as it uses the familiar fuel mix.
  • Lightweight: The mix-lubricated system avoids the need for components like an oil pump, sump and oil tank as on conventional four-strokes.
  • Lower noise threshold: Pleasant sound, even at high power.
  • Lugging power and high torque: Very good acceleration for plenty of power.
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