Combining cam-changing VVT and cam-phasing VVT may satisfy the requirement of both top-end power and flexibility throughout the whole rev range, though it is inevitably more complex. At the time of ...

The earliest variable valve lift systems like Honda VTEC vary valve lift by switching between slow and fast cams at a threshold point. Such discrete mechanism not only creates a step in the power ...

Unlike Ferrari and Lamborghini, Porsche did not build 959 for clinching the title "World's Fastest Car". Since Ferry Porsche created the first 356, Porsche always makes practical sports cars.

6 cylinder engines, no matter inline-6 or V6, are inherently smoother than 4-cylinder inline engines because all the first order and second order forces can be balanced. However, most small cars do ...

All cars need energy for propulsion. When they decelerate and stop, the energy is wasted in braking. Why not recapture the braking energy, store it and use it for acceleration later on? That is ...

Launched together with the mighty Porsche 959 supercar in 1987, Porsche-Steuer Kupplung (PSK) was probably the world's first electronic-controlled 4WD system. Incredibly, even after 30 years, it is ...

As many people know, mechanical superchargers are good for low-end output but short of high-end efficiency, while exhaust turbochargers work strongly at high rev but reluctantly at low rev. For ...

Combining cam-changing VVT and cam-phasing VVT may satisfy the requirement of both top-end power and flexibility throughout the whole rev range, though it is inevitably more complex. At the time of ...

Continuously Variable Transmission is getting more and more popular on small to mid-size cars, eating the market share of manual and low-end automatic transmissions. In 2015, the world produced 11.3 ...

First introduced by Mercedes 300SL in 1954, tuned intake manifold is not exactly a new technology. It is discussed here just because its principle is useful to our further study of variable intake ...

A refined engine should be smooth running, free of vibration and quiet. These qualities also help the engine to spin freer at high rpm, lifting red line hence power output. Engine smoothness depends ...