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Old 30th December 2005, 22:20   #1
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Default Intake valve open on compression stroke??

I was reading the Civic review in the Jan 06 edition of Autocar India.

In it, the writer mentions that Honda have adopted a new tech in their VTEC system. Apparently, it leaves the intake valve open a little during the compression stroke to help reduce strain on the engine or something like that.

Wouldn't leaving the intake valve open during compression lead to a loss of compression? How does this work?
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Old 2nd January 2006, 03:56   #2
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I'm confused too.I just dont get it.
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Old 2nd January 2006, 05:29   #3
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This is done only during part throttle to reduce pumping loss. The throttle is opened more to compensate for this. Remember, in a flyby wire system there is no connection between your foot and the throttle plate.
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