VVT on New Engine Offerings

[gtj]

Anyone know the function of the VVT offered on the new SBC engines?

 

Is there a selenoid at each valve and operation controlled electronically independent of any camshaft?

 

Or is it still some type of multiple camshaft setup which switch cam profiles at certain rpm. Or the special ground cams that vary the valve timing by a fore/aft camshaft movement? Timing chain shifts? Hydraulic pressure variation in lifters?

 

Anybody got the lowdown?

[kdm101]

It's done by altering the cam timing. I forget where I read about it (was it here in one of the news articles?) The gear on the camshaft has a mechanism that will rotate the outer gear ring + or - relative to the hub.

[ZZebes]

which engines is it on???

[gtj]

which engines is it on???

 

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Page 2 of 2 in the description of the 2007 Sierra/Silverado on this site:

 

- 6.0L V-8 (L76), with aluminum block, variable valve timing and Active Fuel Management, rated at 367 hp (274 kW) and 375 lb.-ft. of torque (508 Nm)*.

- 6.2L V-8 (L92), with aluminum block and variable valve timing, rated at 400 hp (298 kW) and 417 lb.-ft. of torque (565 Nm)** – exclusive on GMC Sierra Denali.