2014 Porsche 911 GT3
Engine cross sectionVariable valve timing (VarioCam), hydraulic valve clearance compensation

Lever-type cam follower

Switch tappet with integrated valve clearance compensation

1 Locking pin 2 Outer housing 3 Lost motion spring 7 Inner housing

2013 Porsche 911 Carrera S 
Engine cross section: 3.8-litre boxer engine

Overall length of packaging 367 mm

9HP control unit
The ECU (electronic control unit) is installed separately from the now significantly smaller hydraulic control unit (HCU), namely on the upper side of the transmission housing. The sensors can be found inside the transmission, vehicle-side signals are connected directly to the male plug of the ECU.

Image: ZF

Rotary engines (Wankel and other geometries)
The most famous rotary engine is the Wankel engine. 

Ultimate 86 project Scion FR-S (2013) for Formula Drift
6.2L turbo charged 3UR-FE

GT500 specification engine (3UZ-FE)

Photo: TRD

Intelligent Dual Clutch Drive (i-DCD)

Sport Hybrid i-DCD combines a newly developed 1.5-liter straight four cylinder Atkinson cycle engine, a seven-speed DCT with built-in high-output motor, and a lithium ion battery.

Lamborghini Gallardo engine

Audi R8 V10 engine