In article >,
Walt Kienzle > wrote:
> Some engines based on older designs don't use belts or chains, but they
> usually only have two valves per cylinder (one intake and one exhaust)
> instead of the typical four valves per cylinder that modern (and usually
> more efficient), overhead cam design engines allow.

Bentley in the '20s made a 4 valve OHC engine with the cam driven by
eccentric connecting rods - rather like a steam railway engine.

--
*Even a blind pig stumbles across an acorn now and again *

Dave Plowman London SW 12
RIP Acorn