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

[Rich Vandervoort]

The LS1 Corvette engine does not use EGR either.  The exhaust lobe closes 
early to create an EGR effect.  This also results in a lobe seperation of 
116 degrees.  The C/F LS1 has a different cam and it uses EGR.

Rich V.

>ate: Tue, 10 Oct 2000 21:35:12 -0400
>From: Shannen Durphey <shannen at grolen.com>
>Subject: Re: Way OT, now cam Q ( was EGR Q's  (was: Fuel Econ and >Hiway 
>Mode))

< Re: Way OT, now cam Q ( was EGR Q's  (was: Fuel Econ and Hiway >Mode))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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>Date: Wed, 11 Oct 2000 07:11:32 -0400
>From: David Cooley <n5xmt at triad.rr.com>
>Subject: Re: Way OT, now cam Q ( was EGR Q's  (was: Fuel Econ and >Hiway 
>Mode))

>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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