Valvetronic vs Variocam Plus
#1
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BMW's valvetronic infinitely adjust (stepless) the intake and exhaust valves to achieve 255hp out of the I-6 in the 330i.
Porsche's variocam plus is not infinitely adjusting the valves right?
I'm Not making a comparison to determine which make's engine is better. Just trying to understand the different technology.
Porsche's variocam plus is not infinitely adjusting the valves right?
I'm Not making a comparison to determine which make's engine is better. Just trying to understand the different technology.
#2
Nordschleife Master
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It is essentially the same principles. Both create a variable adjustability to allow for optimum air / exhaust flow rates. Each have specific limits. Depending on air conditions, flow rates, fuel octane levels, fuel amount, etc. All of those inputs are fed to the computer and the computer then adjusts the timing, and valvetrain for those conditions. Very cool technology. Not to mention, Saab is playing with variable valve technology WITH a variable compression ratio. That ought to make your noggin hurt. ![Big Grin](https://rennlist.com/forums/images/smilies/biggrin.gif)
Chad
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Chad
#3
Instructor
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Variocam Plus in the M96/03 engine (2002+ Carreras) is made up of a conventional camshaft angle variator and switchable two-stage inverted cup tappets providing two different valve lift and opening duration modes.
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djantlive: continuosly variable what? Are you referring to valve lift or timing? The lift is two stage: high or low lift. Timing is variable to a certain +- (30deg I think?)