Quote:
Originally Posted by smokey442
What you gain with both the miller or Atkinson cycle is an increase in the expansion ratio. Most engines specify compression ratio. Mathematically compression and expansion ratio are the same. You can manipulate them mechanically in them in the case of the miller cycle by delayed intake valve closing. This lowers the pre combustion pressure to lower the detonation threshold for a given octane. Small gain in reduced pumping losses at part throttle by reducing intake vacume. You do not need a supercharger to take advantage of this method.
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Can this be done to the stock camshaft? I wonder how that conversation would go at a machine shop... Me: "I would like to get an Atkinson regrind on my cam." Machinist: "You want to, huh?"