Flywheel cars reduce fuel 25%

 Cars today use carbon fiber flywheel put in a vacuum, it weighs just 6kg, but may bring fuel efficiency by 25%.
 Flywheel is a mechanical device circular, relatively heavy compared to other structures. It's used to store rotational energy. Flywheels are large inertial torque, rotational speed stability. Flywheels are often used to provide continuous power, where the power supply is interrupted.
When the car brakes, the flywheel effect energy recovery, then "helped" into kinetic energy when the car is running, it can reduce fuel consumption 25% 4-cylinder engine which generates power equivalent to the 6-cylinder engine.
Specifically, in a flywheel structure is mounted on the rear axle. When braking, drivetrain disconnected from the engine to the wheels, the vehicle's kinetic energy changes into kinetic energy "put" to turn the flywheel, the speed of the car when it fell down.
When the vehicle moves forward, the energy accumulated in the flywheel is transmitted to wheels through special actuators. Thus speeding car better than no engine flywheel (new style).
Flywheel technology carbon fiber is placed in a vacuum environment, (in order to reduce energy losses due to friction) are more efficient conventional flywheel.
Flywheel power supply only for a short time in the car, but significant savings in fuel.
Since the energy stored in the flywheel is gradually loss in a short time so this technology will promote greater utility when applied to vehicles in the city, where driving or braking stop and restart with high frequency.
Flywheel energy can be added to the vehicle, increasing capacity by 80 additional horsepower. This allows the engine to reduce the size. It is calculated, using the flywheel, 4-cylinder engine capable of accelerating like 6-cylinder.
The energy stored in the flywheel is transmitted through stepless gearbox, clutch, and the transmission to the rear axle.
New flywheel technology can convert braking energy into electrical energy for storage in the battery average on gasoline-electric hybrid cars (hybrid).
New Flywheel KERS its carbon fiber Volvo fitted to the rear axle. It weighs only 6 kg and 20 cm in diameter, capable of rotating at 60,000 rpm / min. With a capacity of 80 additional horsepower, this car can accelerate to 100 km / h in just 5.5 seconds.
Volvo has started production of a new flywheel technology vehicles this year, after 4 years of study.