At 08:44 AM 9/13/2007, tinker man wrote... >How is engine RPM related to ignition pulse frequency? >The motor is a 4-stroke, 4-cylinder, where every cylinder gets a spark >once in a complete revolution and no two cylinders are sparked >concurrently (1-4-3-2 firing sequence as per Bentley), so it seems it >should be a 1:4 relation. Can anyone verify or correct this >conclusion? A 4 stroke, 4 cylinder engine will fire twice per revolution. Every cylinder gets a spark once every 720 degrees (spark, 180o power stroke, 180o exhaust stroke, 180o intake stroke, 180o compression stroke, repeat), so 4 sparks in 2 revolutions = 2/revolution. |
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