Re: [Amc-list] Super Long Intake Duration Cam ???

[Tom Jennings <tomj@xxxxxxx>]

Yeah, i diddled some crazy valve timing numbers and yes, you can move 
the torque peak above 4000 (on paper) but guess what, probably wouldn't 
idle below 2500. Air has mass, and above 4000, 5000, 6000 rpm, cylinder 
filling is non-trivial, and hypothetical HP is fantasy.

> i wouldn't be surprised if one wouldn't want 2-dimensional control for
> peak efficiency, both speed and throttle as inputs to valve timing.
> narrow timing would be better at less than full throttle at any rpm.

Yeah, I conjured up -- in my head, never, ever, to build -- what it 
would take to to variable valve timing on my AMC six (V8, same). 
Basically if you could make hydraulic lifters with an extra port on the 
side, and put an orfice in the block, with a solenoid that unplugs that 
port, you could END lift cycles early... and so with a wacko cam with an 
extended peak, you could vary valve duration in a way you could 
retrofit. The lifters would have to tolerate collapsing, and their oil 
supply wouldhave to be able to pump them up ASAP. Tall order.
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