Way OT, now cam Q ( was EGR Q's (was: Fuel Econ and Hiway Mode))

[Shannen Durphey]

Somehow, I don't have the specs written down at .002.
Roller hydraulic cam, 0 clearance. Less lobe under .050 than a flat
lifter type.

EFI setup makes cam sound really big, but that's because the timing,
AFR, idle speed aren't right.  Carby setup still had strong cam sound.

Hmmm...  that question shoulda read "LT4 hot cam does not have much
overlap..."
Shannen

Bruce Plecan wrote:
> 
> Whats the cam specs at .002?
> At enough clearance there will be no overlap
> Often the amount of self egr, but playing with the timing AFR can make a cam
> sound healthier then it is
> Bruce
> 
> > LT4 stock cam = no rumpity rump.
> > LT4 "Hot" cam = rumpity rump.
> >
> > Sideline question:
> > LT4 cam does not have much valve overlap.  -1 degree measured at
> > .050".  What causes the "rumpity" idle on a small overlap cam?
> > Shannen
> >
> >
> > Andrew Mattei wrote:
> >
> > >
> > > Best way to go? Ditch the factory EGR and go with a rumpity cam that has
> > > enough overlap to have "built in" EGR. =8) Heck, it was good enough for
> > > LT4 Corvettes. ;)
> > >
> > > Andrew (ducking from the stones about to be thrown)
> > > With a rumptiy cam of my very own. :)
> >
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