Re: Prius owners- fuel grade?

HLS wrote:

"Steve" <no@xxxxxxxxxxx> wrote in message
It also
uses a modified cycle where the expansion and compression strokes are not the same length (the crankshaft is offset relative to the cylinder bore).

How does that work,Steve.. Doesnt that generate some undesirable side forces?


I'm not really up on exactly how it works, although I understand that its an approximation of the Atkinson cycle where the compression and expansion strokes are different. Its different than the Miller cycle where forced induction is used to manage a deliberate reversion of compression back into the intake manifold. It surely does change cylinder wall forces, and probably doesn't do the inherent balance any good either. However from what I've read, it actually *reduces* the most damaging frictional force, which is the side-thrust on the cylinder wall during the expansion phase of the cycle. It does that by likely increasing the side thrust during the compression phase, but the magnitude of that force is always lower than the expansion phase force so its a net friction reduction.

You can do a lot of things when you only have to have the engine survive at a couple of fixed speeds and loadings, rather than everything from idle to redline at every possible loading.


.

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