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EXHAUST INFORMATION:
An exhaust pipe must be carefully designed to carry toxic and/or noxious gases
away from the users of the machine. Indoor generators and furnaces can quickly
fill an enclosed space with carbon monoxide or other poisonous exhaust gases if
they are not properly vented to the outdoors. Also, the gases from most types of
machine are very hot; the pipe must be heat-resistant, and it must not pass
through or near anything which can burn or can be damaged by heat. A chimney
serves as an exhaust pipe in a stationary structure. For the internal combustion
engine it is important to have the Exhaust System "Tuned" (refer to tuned pipe)
for optimal efficiency.
[edit] Motorcycles
Ducati muffler
In most motorcycles all or most of the exhaust system is visible and may be
chrome plated as a display feature. Aftermarket exhausts may be made from steel,
aluminium, titanium, carbon fibre or Kevlar.
Motorcycle exhausts come in many varieties depending on the type of engine and
its intended use. A twin cylinder may flow its exhaust into separate exhaust
sections, such as seen in the Kawasaki EX250 (also known as the Ninja 250 in the
US, or the GPX 250). Or, they may flow into a single exhaust section known as a
two-into-one (2-1). Larger engines that come with 4 cylinders, such as Japanese
supersport or superbikes (such the Kawasaki ZX series, Honda's CBR series,
Yamaha's YZF series, also known as R6 and R1, and Suzuki's GSX-R series) often
come with a twin exhaust system. A "full system" may be bought as an aftermarket
accessory, also called a 4-2-1 or 4-1, depending on its layout. In the past,
these bikes would come standard with a single exhaust, as seen on the Kawasaki
ZX-6R 2000 and 2001 models. However, EU noise and pollution regulations have
generally stopped this practice, forcing companies to use other methods to
increase performance of the motorcycle. This has often led to a decrease in fuel
economy, because of increased weight of the exhaust system and manufacturers
forcing more fuel into the engine to gain extra power.
Trucks
In many trucks / lorries all or most of the exhaust system is visible. Often in
such trucks the silencer is surrounded by a perforated metal sheath to avoid
people getting burnt touching the hot silencer. This sheath may be chrome plated
as a display feature. Part of the pipe between the engine and the silencer is
often flexible metal industrial ducting, as in the image in the section
"Terminology". Sometimes a large diesel exhaust pipe is vertical, to blow the
hot noxious gas well away from people; in such cases the end of the exhaust pipe
often has a hinged metal flap to stop debris and birds and rainwater from
falling inside. Sometimes these exhaust pipes have a flex connector attached
with it. This helps in minimising the vibration from the engine to be
transferred into the exhaust system.
Two-stroke engines
In a two-stroke engine, such as that used on dirt bikes, a bulge in the exhaust
pipe known as an expansion chamber uses the pressure of the exhaust to create a
pump that squeezes more air and fuel into the cylinder during the intake stroke.
This provides greater power and fuel efficiency. See Kadenacy effect.
Marine engines
With an onboard diesel engine below-decks on marine vessels:-
* Lagging the exhaust pipe stops it from overheating the engine room where
people must work to service the engine.
* Feeding water into the exhaust pipe cools the exhaust gas and thus lessens the
back-pressure at the engine's cylinders' exhaust ports and thus helps the
cylinders to empty quicker.
Outboard motors
In outboard motors the exhaust system is usually a vertical passage through the
engine structure and to reduce out-of-water noise blows out underwater,
sometimes through the middle of the propeller.
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