Timing belt ?

[Huw Powell]

> Another solution for the non-rotating [cam] pulley.  Was the engine
> in question viewed at night under a light source that was most likely
> 60Hz.  The rotation speed of the [cam] pulley could have been in sync
> with the 60Hz. giving the appearance of no rotation?

Well, if it was a strobe, with an idle dead on 720 rpm, the cam would be 
at 360 rpm, or 6 rps - the cam pulley is hexagonally symmetrical (ie, at 
every 1/6 rotation, it looks the same) - so although far-fetched, it is 
"possible".

However, most light sources, esp. incandescent, are far from strobes. 
And the odds of a tight 720 rpm idle are about zero.

Still, it's a great concept....

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/