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Old 09-27-2003, 03:34 PM
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Miller-Cycle SBC?

I was just reading an article on the Mazda Miller-Cycle engine and from my understanding, the only way it really differs from a domestic engine such as a sbc was that the intake valve stays open for the first part of the compression stroke to yeild less of a actual compression ratio and allow you to run higher boost (and therefore, a higher theoretical compression ratio without the problems of detonation).

I was wondering if a camshaft could be designed for a small block chevy to hold the intake valves open for the first part of the compression stroke. Then you could supercharge the engine and run high boost levels without detonation. Mazda claims they produce more power than engines over a liter bigger then the miller-cycle's. Not that I'd do it or I'm in a position to do it, just wondering if it is possible and if it is, why people don't do it.

1984 Pontiac Grand Prix
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Old 09-27-2003, 06:01 PM
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from what ive seen on it it makes for a larger expantion ratio with keeping the compression down... i think the problem with it is with the valve staying open during copmpression its going to push air back through the intake which will create a bit of turbulance and such... my guess why people dont use it more is that it takes a lot of tuning and stuff to get them to run good
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Old 09-28-2003, 12:43 AM
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Cams actually do stay open into the compression stroke.Thats how come you bleed off compression with a larger cam.
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