Quote:
Originally Posted by oil pan 4
On paper the otto cycle can be up to 73% efficient (if I remember correctly) so it would be nice to see how this one does in the real world.
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Otto cycle efficiency is related to compression ratio. In theory the Otto cycle can get as close to 100% efficiency (but less than 100%) if you run a high enough CR.
If you include the slight advantage of having a larger expansion ratio, 75% efficiency requires a CR of about 30:1, Which I think is going to be expensive to deliver with the durability expected in modern machinery - considering those sliding seals, especially the end down by the axis. Mazda always had trouble with those seals.
-mort