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HCCI engines are pretty cool in theory but would require a LOT of engineering to get it right, not to mention a heavy ass block to withstand the constant abuse of "detonation" the main principal there operating under.. Lean burns much more of a practical application.
I'm currently working on building a new engine for the beater. It all used parts that people were planning on throwing away or I had laying around. It'll be around 10-1 compresion with flat top pistons, a head that has much larger quench pads and much tigter piston to head clearence than a normal engine would have, it'll also be slightly less displacement (1.5L vs the 1.6L) thats currently in the car. It will have a vtec head that has a "smaller" camshaft profile than whats in the car now (when vtec is not engaged), and hopefully when in vtec it will make a little more power.
Ben
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