Acdelco Oe Service 213-3944 Knock (detonation) Sensor-knock Sensor on 2040-parts.com

Concept Car of the Week: Mercedes-Benz C111, C111-II and C111-IID

In 1962, Mercedes-Benz launched a research program to investigate the development of the Wankel rotary engine and its potential both on the road and track. While the early mule wasn't a looker, the prototype's design continued to evolve until a public unveiling of the C111-I concept, designed by Bruno Sacco, at the 1969 Frankfurt motor show. The coupé may have looked like the systematic further development of the Sport Light models from the ‘50s with its gullwing doors, but it wasn't a design study for a new SL.

2014 Porsche Panamera Turbo S facelift revealed

The 2014 Porsche Panamera Turbo S (pictured) debuts in Tokyo next month. It’s six months since Porsche revealed a facelift for the Panamera and now, ahead of its debut at the Tokyo Motor SHow, we get the final piece of the Panamera range’s updates – the 2014 Porsche Panamera Turbo S. The cosmetic updates for the Panamera Turbo S are similar to those across the rest of the range, with small tweaks to the nose and front lights and bigger changes to the back with a bigger rear window and various tweaks to make the dog-humping back end of the Panamera a little more appealing.

Four-wheel, two-wheel BMWs battle it out in 'The Chase'

A just-released Internet video pits two Akrapovic-tuned BMWs against one another to see which is faster--the two-door BMW M3 coupe or the BMW 1000 RR motorcycle. Starting at opposite sides of an unnamed street circuit, the winner takes 15 laps to overcome its "slower" opponent. See who wins the battle of the Bavarians in the video.