YICS

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- Ziegenberg ( discussion ) 13:58, June 16, 2016 (CEST)

YICS is the abbreviation for Y amaha I nduction C ontrol S ystem and the name for a technology for the construction of multi-cylinder motorcycle engines that Yamaha developed in 1979.

Working principle

During the intake process, the gas mixture flows in from the neighboring cylinders through a cross-connection between the inlet ducts, thus ensuring swirling and better mixing of the gasoline-air mixture. The aim is to make the combustion in the cylinder more effective in order to reduce consumption.

For adjustment work on the carburettors, the YICS must be shut down using a special tool.

variants

Right engine side of a Yamaha XZ 550. You can see the diamond-shaped, chrome-plated YICS container between the cylinders and the inscription YICS on the housing of the water pump.

The YICS system was also used in the two-cylinder V-engine of the Yamaha XZ 550 . In this case, the connections arranged tangentially in the inlet channel of each cylinder open into a decoratively designed plastic box which contains separate, sealed chambers for each cylinder. With this version of the system, adjustments do not require deactivation as with the above. open system. A weak point is that said plastic can can leak over time, which leads to a deterioration in the response of the engine and a significant increase in fuel consumption.

Web links

Individual evidence

  1. ^ History Timeline (USA). Yamaha Motor Corporation USA, accessed on June 16, 2016 (English): "1979 - YICS (Yamaha Induction Control System), a fuel-saving engine system, was developed for 4-stroke engines."
  2. ↑ The Yamaha XJ550 Seca. Motorcycle Classics, May 2012, accessed on June 16, 2016 (English): "The idea was to create extra swirl in the combustion chamber and therefore more efficient combustion."