Quote:
Originally Posted by Mudgey
Audi run their dactivation system by trapping exhaust gases in the two non operating cylinders, this overcomes the pumping losses in the now 'dead' cylinders but they have a precise system that can operate quick enough and at a specific time to trap the gases,
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That's how all true cylinder deactivation systems work. Examples of US automakers' entries include Chrysler's Multiple Displacement System and Government Motors' Active Fuel Management (or Displacement On Demand).
Quote:
Originally Posted by Mudgey
if you ran a vacuum you would, over time, draw oil and gases up from the crankcase which is not a good idea!
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My understanding is that the valves on the given cylinder are deactivated during the compression stroke. The final air/fuel mix is combusted as usual, but is not pushed out via the exhaust stroke. This would solve that vacuum induction issue.
Quote:
Originally Posted by Mudgey
How I could specifically operate the VTEC at the required moment is still up for debate....
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Conduct research, and experiment. That's all I can recommend, having not very much practical experience with VTEC.