Suzuki Advanced Cooling System

Last updated

The Suzuki Advanced Cooling System (SACS) was developed by Suzuki engineer Etsuo Yokouchi in the early 1980s. The system was used extensively on GSX-R model bikes from 1985 through 1992. Suzuki continued to use the system in its GSF (Bandit) and GSX (GSX-F, GSX1400, Inazuma) lines until the 2006 model-year and DR650 from 1990 to present. Engines using the SACS system were generally regarded as being very durable.

Contents

Development

While addressing reliability issues in Suzuki's only turbo charged bike, the XN85, the SACS system was first conceived by Etsuo Yokouchi, who looked to World War II–era aircraft for inspiration. Like air-cooled motorcycles, radial engines used in many early aircraft suffered from heat and reliability issues. To overcome these problems, aircraft engineers often used oil jets aimed at the bottom of an engine's pistons to carry away excess heat. Following their example, Yokouchi decided to apply the approach to motorcycles.

When the GSX-R entered development, Suzuki set a goal of 100 horsepower (75 kW) for a 750 engine and, due to known heat-related problems in high-power air-cooled engines, determined that air cooling alone would not be sufficient. Therefore, the SACS system was applied to the bike's design and was eventually carried over to all larger GSX-Rs. The final GSX-R SACS engine appeared on the Suzuki GSX-R1100 in 1992, later bikes featured water cooling.

Suzuki Advanced Cooling System Badge from a 1991 GSX-R 1100 Suzuki Advanced Cooling System brand label.jpg
Suzuki Advanced Cooling System Badge from a 1991 GSX-R 1100

Mechanics

The SACS system uses high volumes of engine oil aimed at strategic points of the engine, like the top of the combustion chamber, which are not typically well served by air cooling alone. In order to provide enough oil for both cooling and lubrication, the system uses a double-chamber oil pump, using the high-pressure side for lubrication of the parts (crankshaft, connecting rods, valvetrain), while the low-pressure, high-volume side provides oil to the cooling and filtering circuit. The oil removes heat from hot engine parts through direct contact, is pumped away and subsequently routed through the oil filter, followed by routing through an oil cooler before being returned to the main sump. [1]

Related Research Articles

<span class="mw-page-title-main">Two-stroke engine</span> Internal combustion engine type

A two-strokeengine is a type of internal combustion engine that completes a power cycle with two strokes of the piston in one revolution of the crankshaft. A four-stroke engine requires four strokes of the piston to complete a power cycle in two crankshaft revolutions. In a two-stroke engine, the end of the combustion stroke and the beginning of the compression stroke happen simultaneously, with the intake and exhaust functions occurring at the same time.

Internal combustion engine cooling uses either air or liquid to remove the waste heat from an internal combustion engine. For small or special purpose engines, cooling using air from the atmosphere makes for a lightweight and relatively simple system. Watercraft can use water directly from the surrounding environment to cool their engines. For water-cooled engines on aircraft and surface vehicles, waste heat is transferred from a closed loop of water pumped through the engine to the surrounding atmosphere by a radiator.

<span class="mw-page-title-main">Suzuki GSX-R series</span> Sports motorcycle models

Suzuki GSX-R is a series of sports motorcycles made by Japanese automotive manufacturer Suzuki since 1984.

<span class="mw-page-title-main">Dry sump</span> Method of internal combustion engine lubrication with oil held in a separate reservoir

A dry-sump system is a method to manage the lubricating motor oil in four-stroke and large two-stroke piston driven internal combustion engines. The dry-sump system uses two or more oil pumps and a separate oil reservoir, as opposed to a conventional wet-sump system, which uses only the main sump below the engine and a single pump. A dry-sump engine requires a pressure relief valve to regulate negative pressure inside the engine, so internal seals are not inverted.

<span class="mw-page-title-main">Suzuki GS series</span> Series of motorcycles

The Suzuki GS series was Suzuki Motor Corporation's first full range of 4-stroke powered road motorcycles, having previously almost exclusively manufactured 2-stroke machines. Suzuki had produced the 4-stroke Colleda COX 125cc and 93cc 4-stroke single-cylinder machines in 1955 however the rest of Suzuki's production from 1952 to 1976 had been increasingly sophisticated two-stroke road machines, whose ultimate expression was the 750cc 3-cylinder water-cooled GT750.

The GSX Series is Suzuki's range of sport touring motorcycles powered by four-valve per cylinder four-stroke engines. The first GSX models were introduced in 1980 and represented the next step in Suzuki's four-stroke road bike range after the two-valve GS Series.

<span class="mw-page-title-main">Suzuki Bandit series</span> Type of motorcycle

The Suzuki Bandit is a series of standard motorcycles produced by Suzuki since 1989. The Bandit series includes the following models:

<span class="mw-page-title-main">Suzuki GSX-R750</span> Sports motorcycle

The Suzuki GSX-R750 is a sports motorcycle made by Suzuki since 1984. It was introduced at the Cologne Motorcycle Show in October 1984 as a motorcycle of the GSX-R series for the 1985 model year.

<span class="mw-page-title-main">Suzuki GSX-R1000</span> Sports motorcycle

The Suzuki GSX-R1000 is a supersport motorcycle made by Suzuki. It was introduced in 2001 to replace the GSX-R1100 and is powered by a liquid-cooled 999 cc (61.0 cu in) inline four-cylinder, four-stroke engine although originally 988 cc (60.3 cu in) from 2001 to 2004.

<span class="mw-page-title-main">Suzuki RE5</span> Japanese Wankel engine motorcycle

The Suzuki RE5 is a motorcycle with a liquid-cooled single-rotor Wankel engine, manufactured by Suzuki from 1974 to 1976. Apart from its unusual engine, the RE5 is mostly a conventional roadster, albeit with some peculiar styling details thanks to Italian industrial designer Giorgetto Giugiaro.

Oil cooling is the use of engine oil as a coolant, typically to remove surplus heat from an internal combustion engine. The hot engine transfers heat to the oil which then usually passes through a heat-exchanger, typically a type of radiator known as an oil cooler. The cooled oil flows back into the hot object to cool it continuously.

<span class="mw-page-title-main">Norton Classic</span> Type of motorcycle

The Norton Classic is a rotary-engined motorcycle built in 1987 by Norton as a special edition of just 100 machines.

<span class="mw-page-title-main">Oil pump (internal combustion engine)</span> Internal combustion engine part that circulates engine oil under pressure

The oil pump is an internal combustion engine part that circulates engine oil under pressure to the rotating bearings, the sliding pistons and the camshaft of the engine. This lubricates the bearings, allows the use of higher-capacity fluid bearings and also assists in cooling the engine.

A plenum chamber is a pressurised housing containing a fluid at positive pressure. One of its functions is to equalise pressure for more even distribution, compensating for irregular supply or demand. It is typically relatively large in volume and thus has relatively low velocity compared to the system's other components. In wind tunnels, rockets, and many flow applications, it is a chamber upstream on the fluid flow where the fluid initially resides. It can also work as an acoustic silencer.

<span class="mw-page-title-main">Components of jet engines</span> Brief description of components needed for jet engines

This article briefly describes the components and systems found in jet engines.

<span class="mw-page-title-main">Suzuki GSX-R1100</span> Type of motorcycle

The Suzuki GSX-R1100 is a sport bike from Suzuki's GSX-R series of motorcycles produced from 1986 until 1998.

<span class="mw-page-title-main">Total-loss oiling system</span> Engine lubrication system

A total-loss oiling system is an engine lubrication system whereby oil is introduced into the engine, and then either burned or ejected overboard. Now rare in four-stroke engines, total loss oiling is still used in many two-stroke engines.

<span class="mw-page-title-main">Internal combustion engine</span> Engine in which the combustion of a fuel occurs with an oxidizer in a combustion chamber

An internal combustion engine is a heat engine in which the combustion of a fuel occurs with an oxidizer in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine, the expansion of the high-temperature and high-pressure gases produced by combustion applies direct force to some component of the engine. The force is typically applied to pistons, turbine blades, a rotor, or a nozzle. This force moves the component over a distance, transforming chemical energy into kinetic energy which is used to propel, move or power whatever the engine is attached to.

David W. Garside is an inventor and former project engineer at BSA's Kitts Green research facility. He is notable for having developed an air-cooled twin-rotor Wankel motorcycle engine which powered the Norton Classic road bike. Although the Classic was not the first production rotary-engined bike, it was significantly lighter, smoother, more powerful and better-handling than the contemporary Suzuki RE5.

<span class="mw-page-title-main">Suzuki A100</span> Japanese motorcycle made beginning 1966

The Suzuki A100 is a Japanese motorcycle from the Suzuki Motor Corporation with production starting in 1966.Similar models were produced by Yamaha and Kawasaki with the YB100 & KH100 models, also with a single-cylinder two-stroke engine and rotary valve being examples.

References

  1. "Suzuki Motorcycles, GSX R 750, GSX R 1100 Generation 1: 1985 - 1987". gsxr-suzuki.info. Archived from the original on 2012-02-14. Retrieved 2007-08-28.