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

[David Cooley]

At 09:35 PM 10/10/2000 -0400, you wrote:
>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?


Exhaust dilution...  Lean mixture
lobe separation plays a big part even without a large overlap.


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