Re: Vortec I-6 for 2005

[farna@xxxxxxx]

Ahhh... so it varies EXHAUST timing, not INTAKE. Intake sounds more logical at first... until you hear THEM explain it... ;> 

On September 30, 2005 Brien Tourville wrote:

> [quote'
> Then Chevy came out with the "
> Vortec I-6 as their new truck engine. It has variable timing, and the
> "
> I-6 is a cost saving package for that. With a V engine four cam
> adjust "
> mechanisms are needed, with the in-line only two (or one if only
> intake "
> or exhaust is variable).
> 
> btw only one cam is variable on the 4200 vortec - cost and complexity
> issues, i suppose.
> [end quote]
> 
> 
> 
>              Vortec 4200 4.2L I-6 (LL8)
> 
> 
> IMPROVED CAM PHASER
> "The Vortec 4200 is now equipped with a vane-type cam phaser,
> replacing the helical spline and piston phaser used since the
> engine's launch. The vane phaser represents the current state-of-the-
> art in cam phaser and it delivers several benefits."
> 
> The cam phaser changes exhaust cam lobe timing relative to the cam-
> drive sprocket, which in turn varies exhaust valve timing on the fly,
> maximizing engine performance for given demands and conditions.
> 


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