Rick Girard wrote:

Paul et al, I've been reading this thread for some days. Those that
postulate that small runner diameters some how overcome their size with
greater velocity might do well to review Formula One Grand Prix engine
development in the late fifties. I remember looking at a picture of the
Coventry Climax engine (a fire truck engine raced on the world stage) of
a whopping 91 cubic engine displacement with a pair of 48 IDA Weber
carbs hanging off the side. The commentator marveled at the fact that
the engine would not only produce copious power for racing, but also
idle quite civilly. That capability was attributed to the venturi shaped
manifold designed to couple those giant carbs to the limited port size
of the Coventry. It kept the intake velocity up so the mixture wouldn't
stagnate at idle and, along with the velocity stacks that effectively
increase runner length, prevented stand off at high RPM's. Wish I still
had the picture of that engine sitting in the Cooper, it was a beauty.

Rick Girard

 
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