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Originally Posted by vstech
On a gasoline engine, the intake valves overlap in time with the piston drop, maintaining a constant vacuum in the intake behind the throttle plate…
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Are you talking about otto cycle, atkinson cycle or miller cycle? What about BMW's Valvetronic or Fiat's MultiAir that don't use a throttle but widely vary intake timing/duration to throttle the airflow into the cylinder?
Quote:
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A traditional Diesel engine has different valve timing, and opens as the piston begins dropping… so, the vacuum is far less than in a gasoline engine.
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Except with Mercedes OM engines, where the valve overlap and intake opening timing is different between turbo and non-turbo, and even year to year.
Blanket statements do not fit well in discussions.