brickboy

Bloody hell, it's got some technology in it ... the engine uses the Atkinson cycle, not a conventional crankshaft ...

Full story here

The Atkinson cycle: check that bottom end!

cletterridge

Sorry, it's not really Atkinson cycle! Yes, they've managed to kind of get a longer expansion stroke than compression stroke, but it's done by basically cheating! No fancy crankshaft at all - what they've done is simply make the inlet valve close a little bit "late", so a little air backtracks into the manifold. So, more like a Miller cycle then. BUT that still means peak thermal efficiency of 36%, which is pretty special for a petrol engine.



You can read more about it here....

http://www.toyota.co.jp/en/tech/envi...s2/engine.html

brickboy

Fiendishly clever, these Japanese