Miller cycle SC engine
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Joined: Nov 2003
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From: Norn Iron
Miller cycle SC engine Im asking this, as it was asked by someone else on another forum I browse.
I had never really heard of it before myself. If you do a Yahoo, or Google search on "Miller cycle" you will find the explanation.
Normal engines use the Otto cycle 4 stroke, which uses cam designs that we all know.
The Miller uses quite different intake timing, apparently to achieve better emissions and power, and economy, on a supercharged engine. It leaves the closing of the intake valve much later, so the piston is on its way back up again, and actually forces some of the intake charge, back into the intake. What it does though, is mean there is less energy used to push the piston back up the bore, for a very small reduction of charge within the chamber. In a way, it also reduces the effective CR, but it also reduces combustion chamber temps, which allows more timing, and hence more power....apparently.
Has anyone any thoughts on this ?? ever tried it ??
From doing a bit of searching, Mazda seems to be about the only mass producer to have tried it.
I had never really heard of it before myself. If you do a Yahoo, or Google search on "Miller cycle" you will find the explanation.
Normal engines use the Otto cycle 4 stroke, which uses cam designs that we all know.
The Miller uses quite different intake timing, apparently to achieve better emissions and power, and economy, on a supercharged engine. It leaves the closing of the intake valve much later, so the piston is on its way back up again, and actually forces some of the intake charge, back into the intake. What it does though, is mean there is less energy used to push the piston back up the bore, for a very small reduction of charge within the chamber. In a way, it also reduces the effective CR, but it also reduces combustion chamber temps, which allows more timing, and hence more power....apparently.
Has anyone any thoughts on this ?? ever tried it ??
From doing a bit of searching, Mazda seems to be about the only mass producer to have tried it.
