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VarioCam varies the timing of the intake valves by adjusting the tension on the timing chain connecting the intake and exhaust camshafts. VarioCam was first used on the 1992 3.0 L engine in the Porsche 968. Porsche's more recent VarioCam Plus combines variable valve timing with two-stage lift on the intake side. The two-stage valve-lift ...
There were two overhead camshafts per cylinder bank, operating two valves per cylinder. [1]: 314 [3]: 98 [2]: 324 As with the 547, the cams were driven by shafts rather than gears or chains, and the cam lobes were separate pieces that were keyed onto the shaft. The 753 added a second countershaft above the crankshaft to the single one ...
2005–2009 3.4 L (3,387 cc) 295 PS (217 kW; 291 bhp) 340 N⋅m (250 lbf⋅ft) water-cooled DOHC 24-valve Boxer flat-six (VarioCam Plus) "M97.21" (Cayman S, Cayman S "Porsche Design Edition 1") 2008–2009 3.4 L (3,387 cc) 303 PS (223 kW; 299 bhp) 340 N⋅m (250 lbf⋅ft) water-cooled DOHC 24-valve Boxer flat-six ( VarioCam Plus ) "M97.22 ...
In 1958 Porsche made application for a German patent, also applied for and published as British Patent GB861369 in 1959. The Porsche patent used an oscillating cam to increase the valve lift and duration. The desmodromic cam driven via a push/pull rod from an eccentric shaft or swashplate. It is unknown if any working prototype was ever made.
The Porsche 904 is an automobile which ... (120 cu in) Type 587/3, [4] four-cam flat four ... The valves were operated by two overhead camshafts with ...
There were two overhead camshafts per cylinder bank, operating two valves per cylinder. As with the 547, the cams were driven by shafts rather than gears or chains, and the cam lobes were separate pieces that were keyed onto the shaft. The 753 added a second countershaft above the crankshaft to the single one underneath the crankshaft in the 547.
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The cam can be seen as a device that converts rotational motion to reciprocating (or sometimes oscillating) motion. [clarification needed] [3] A common example is the camshaft of an automobile, which takes the rotary motion of the engine and converts it into the reciprocating motion necessary to operate the intake and exhaust valves of the cylinders.