B Jr wrote:
> > oops..forgot this one..anyone done the math for how much valve duration is
> > lost from min to max clearance, and or the lost area of flow past the
> > valves?
Ay Carumba! If anyone has a useful mathematical model of the cam
profile,
good luck to them.
Maybe one day I'll get around to setting up a cylinder head on a bench
and attaching a degree wheel to a cam.
Walter Lesnowich replied:
[...]
> You can change the power band a bit when using
> a solid lifter motor by varying valve lash settings.
I would have said "a little bit"...
[...]
> Also, be careful because the valve lash is
> the "Cooling Time" that the valve needs on each
> cycle. If you have no lash you take a chance of
> burning the valves.
IMO:
Valve burning is usually more a function of the valve not seating
fully and leaking combustion gas, whether due to insufficient clearance
or other less common reasons.
"Cooling time" concerns are more a product of extreme valve off-seat
time due to radical cam profile.
Mister_T