On Tue, 16 Jun 2009 19:54:20 +0100, Jan Carlsson
wrote:


'Veeduber[_2_ Wrote:
;695919']To All:

For example ALL engines have some degree of overlap
in their cam timing. If you have a text book that says otherwise, it
is in error.


No Not all engines have overlap, not early rotary radials with one
pull/push rod operating the single rocker between the valves, opening
one valve at the time, the valve clearence make it impossible to open
both at the same time.

Jan
And then there is the "atmospheric" intake valve.