The new high-tech 2.0-liter unit is derived from the already much praised 1.8 TFSI engine introduced recently in A3, A4 and A5 models, but takes its efficiency a step further still through the use of new Audi valvelift technology. By employing sliding cam units mounted on the intake camshaft that allow for more variation in the degree of valve lift, the engine is able to ‘breathe’ even more effectively, switching to a higher cam profile when strong acceleration is required, or a lower profile that requires less fuel and air compression when throttle usage is more relaxed.
Hmm. Sounds similar to Honda's V-Tec system....
Originally Posted by
Killerteve
Speaking of cranks, do you think we'll see the cranks with the variable valve lift from the new "high-torque" 2.0 TFSI from the front page article in the B8?
The cranks have nothing to do with it. Its all in the cams. In fact, all the FSI cranks are is a 92.8mm stroke crank like the AEG crank I'm using. Jake alluded to it earlier in this thread.
The FSI cams are much different than our 1.8 cams. They only have two lobes on the intake side since there are only 2 intake valves (we have 3). They also have a lobe out front that drives the FSI fuel pump system (a common failure issue the 2.0 FSI engines are seeing but an aftermarket fix is in the works). They are also extremely light in weight relative to the 1.8 cams and contain a notch for access to the head bolts (without removing the cams). And those are just the physical differences.
Not sure if that technology can be adapted to the 1.8.
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