VVC vs VTec
Δημοσιεύτηκε: Δευ Μαρ 29, 2010 10:31 pm
K series is the BEST with the VVC on the top. The basic concept was developed by a mr. Mitchell and it was published
and patented back in 1973. However no one used it and it was forgotten
until Rover re-discovered it. In 1989 Rover began experimenting with the
system and in 1993 had developed a 1.4 litre version with VVC Rover K-series engine, the revolutionary four cylinder There are a lot of manufacturers who have variable valve control systems.
There are three basic variants:
l Cam phasing, The timing of the cam is being altered, the duration
remains the same
l Cam lobe switching, A hydraulic system operates the valve from
one of two lobes
l Variable duration
At this moment (Jan 2001) Rover is the only one who has a mass
production engine with a variable duration of the camshaft. A bigger
duration has more effect on power than opening and closing the valve later
as with cam phasing systems. The Rover system is without a doubt far
superior to all the cam phasing systems. It would be possible to incorporate
a cam lobe switching mechanism to switch to a higher lift cam lobe as with
Honda's VTEC. This would give the Rover engine the best of all worlds.
And to make it a mechanical marvel.......
please Rover, make it a V8.......
4.0 litre 32V quad-OHC VVC.......Yummie!,
300 bhp would just do nicely, thank you.
and patented back in 1973. However no one used it and it was forgotten
until Rover re-discovered it. In 1989 Rover began experimenting with the
system and in 1993 had developed a 1.4 litre version with VVC Rover K-series engine, the revolutionary four cylinder There are a lot of manufacturers who have variable valve control systems.
There are three basic variants:
l Cam phasing, The timing of the cam is being altered, the duration
remains the same
l Cam lobe switching, A hydraulic system operates the valve from
one of two lobes
l Variable duration
At this moment (Jan 2001) Rover is the only one who has a mass
production engine with a variable duration of the camshaft. A bigger
duration has more effect on power than opening and closing the valve later
as with cam phasing systems. The Rover system is without a doubt far
superior to all the cam phasing systems. It would be possible to incorporate
a cam lobe switching mechanism to switch to a higher lift cam lobe as with
Honda's VTEC. This would give the Rover engine the best of all worlds.
And to make it a mechanical marvel.......
please Rover, make it a V8.......
4.0 litre 32V quad-OHC VVC.......Yummie!,
300 bhp would just do nicely, thank you.