Four Stroke Engine

2 Comments

The most common engine design found in street motorcycles. It refers to the number of times a piston moves up and down through each power cycle.

  1. A downward stroke brings in the fuel/air mixture
  2. an upward stroke compresses the fuel/air mixture
  3. a downward stroke results when that mixture is ignited and expands (also known as the Power Stroke)
  4. and finally an upward stroke expels the exhaust gases

(Compare Two Stroke Engine)


Comments

2 Comments so far

  1. Ignition Timing : Motorcycle-Glossary.com on May 14, 2007 11:48 am

    [...] process of setting the time that a spark will occur in the engine combustion chamber (during the power stroke) relative to piston position or crankshaft rotation. Setting the correct ignition timing is crucial [...]

  2. Two Stroke Engine : Motorcycle-Glossary.com on February 20, 2007 2:04 pm

    [...] (Compare Four Stroke Engine) [...]

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