[Shotimes] +20 cam valve noise

[Ian Fisher]

Yah, I believe that I read on SHOnut's site that the
+20 cams have quieting ramps incorporated into the
grind. Of course that doesn't mean that they aren't
there and that the +20 grind is still agressive enough
to create extra valvetrain noise..

Ian

--- bjshov8 <bjshov8@comcast.net> wrote:

> Well, yes and no.  As I recall from my years of
> stuffing mechanical lifter
> cams in V8 chevies, a proper mechanical lifter cam
> is ground to provide a
> transition, or "ramp", to take up the valve
> clearance before really getting
> into the lobe.  I wonder if a regrind of our cams
> has this shape integrated
> into it.
> 
> 
> > The extra valve noise, I think, comes from the
> change
> > in profile over the stock lobe.  The longer
> distance from
> > the base circle to the lobe tip would have more
> impact
> > than stock.  The tip of the cam lobe hits the shim
> like a
> > hammer hits a nail.  Think of two hammers with
> different
> > length handles. The "+20" hammer would hit the
> nail, or
> > shim in this case, with more force.
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