Variable Valve Or Cam Timing
12-27-2010, 06:42 PM
#1
Drifting
Thread Starter
Variable Valve Or Cam Timing
Some of the new Ford engines, Porsche Panamera and others are not only either using or not using superchargers but they are incorporating variable valve or cam timing/opening height into single and double overhead cam engines to have more efficient engines. I went right to the ZR1 2011 website and couldn't find anything but supercharger and dry sump oil systems. Is this something that others are getting ahead of us on or is this something that GM just isn't marketing well but is already doing? It looks pretty complex but today's control sensors and precision must make it work. The Porsche Panamera four door sedan in V8 model can hit 196 mph and seats four.....'Does anyone know if this is in Corvette or coming or if it's not something a Corvette needs?
12-27-2010, 07:05 PM
#2
Race Director
VVT is on many modern engines including Vettes for a number of years. Not sure when GM started but my wife's 2003 Saturn has it.
Very cool technology and not all that complicated.
Very cool technology and not all that complicated.
12-27-2010, 11:06 PM
#3
Drifting
The 90 ZR1 had variable timing; it used 2 cams per bank. The other cam came on at a certain RPM as I recall enabling high rpm/hp. There was a valet switch that disabled the 2nd cam. Hondas have had variable cam timing for many years. it's pretty commonn technology nowadays...
12-28-2010, 02:14 AM
#4
Burning Brakes
Does the corvette need it? Probably not. The Z06 already gets close to 30 MPG with 505 HP and no VVT.
12-28-2010, 07:07 AM
#6
Drifting
Thread Starter
That was my impression, that essentially the C6's had not tapped into vvt at all, favoring a more muscular though less efficient approach with superchargers and more multispeed trannies. I wonder if there is a C7 being developed what it's power plant will be like with the current forecast of gas prices in the $5.30 a gallon range over the next four years. It's $3.30 a gallon for premium here already. All those Chinese nationals buying cars and using gasoline!
