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Terminology In The Exhaust System
Jul 19, 2018

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Aftermarket exhaust manifold
In most production engines, a manifold is a component designed to collect exhaust gases from two or more cylinders into one pipe. Manifolds are often made of cast iron in stock production cars, and may have material-saving design features such as to use the least metal, to occupy the least space necessary, or have the lowest production cost. These design constraints often result in a design that is cost effective, but does not exhaust gases from the engine most efficiently. Due to the nature of the internal combustion engine and its cylinders, inefficiencies usually occur. Since the cylinders ignite at different times, the exhaust gases leave them at different times, and when another cylinder occurs, the pressure waves from the gas of one cylinder may not be completely vacated through the exhaust system. This creates back pressure and limits in the engine exhaust system, limiting the true performance of the engine. In Australia, the pipe of the exhaust system which attaches to the exhaust manifold is called the 'engine pipe' and the pipe emitting gases to ambient air called the 'tail pipe'.
Regardless of the negative attributes focused upon by potential sellers of steel tube exhaust outlet configurations, engineers designing engine components can choose a conventional cast iron exhaust manifold that can similarly list positive attributes, such as a range of thermal management capabilities and any other type of length. Vent design. For the average consumer, problems with the exhaust system can result in "poor performance."

Header-back
The Header-back (or header back) is the part of the exhaust system from the outlet of the header to the final vent to open air — everything from the header back. Header-back systems are generally produced as aftermarket performance systems for cars without turbochargers.

Turbo-back
The Turbo-back (or turbo back) is the part of the exhaust system from the outlet of a turbocharger to the final vent to open air. Turbo-back systems are generally produced as aftermarket performance systems for cars with turbochargers. Some turbo-back (and header-back) systems replace stock catalytic converters with others having less flow restriction.

With or without catalytic converter
Some systems (including in former time all systems) (sometimes now called catless or de-cat) eliminate the catalytic converter. This is illegal and there are no catalytic converters in the United States and other countries that violate federal laws.The converter must not be removed from vehicles used only for US “off-road” driving. The main purpose of catalytic converters on automobiles is to reduce the harmful emissions of hydrocarbons, carbon monoxide and nitrogen oxides into the atmosphere. They work by transforming the polluted exhaust components into water and carbon dioxide

Cat-back
Cat-back (also cat back and catback) refers to the portion of the exhaust system from the outlet of the catalytic converter to the final vent to open air. This generally includes the pipe from the converter to the muffler, the muffler, and the final length of pipe to open air.
Cat-back exhaust systems generally use larger diameter pipe than the stock system. The mufflers included in these kits are often glasspacks, to reduce back pressure. If the system is engineered more for show than functionality, it may be tuned to enhance the lower sounds that are lacking from high-RPM low-displacement engines.

Tailpipe and exhaust

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The Corvette C7 has four tailpipes
With trucks, sometimes the silencer is crossways under the front of the cab and its tailpipe blows sideways to the offside (right side if driving on the left, left side if driving on the right). The side of a passenger car on which the exhaust exits beneath the rear bumper usually indicates the market for which the vehicle was designed, i.e. Japanese (and some older British) vehicles have exhausts on the right so they are furthest from the curb in countries which drive on the left, while European vehicles have exhausts on the left.
The end of the final length of the exhaust pipe, which leads to open air, typically the only visible portion of the exhaust system components on the vehicle, typically ends only with a straight or angled cut, but may include a fancy tip. The tip is sometimes chromed. It is usually larger than the rest of the exhaust system. This produces a final pressure drop that is sometimes used to enhance the appearance of the car.
In the United States in the late 1950s, manufacturers used car styling to form rear bumpers, each with a hole through which the exhaust gas passed. The two exits symbolize the V-8 power, and only the most expensive cars (Cadillac, Lincoln, Empire, Packard) are equipped with this design. One reason for this was that the luxury sedan at the time had such a long overhang, and the exhaust pipe scratched the ground as the car crossed the slope. After the customer noticed that the rear end of the car (low pressure zone) collected soot from the exhaust and its acidic components entered the chrome-plated rear bumper, the fashion disappeared.
When a bus, truck or tractor or excavator has a vertical exhaust pipe (called a chimney or pipe behind the cab), sometimes the end is curved, or there is a hinged cover, the airflow will blow away, trying Prevent foreign objects (including bird droppings from the exhaust pipe when the vehicle is not in use) into the exhaust pipe. [requires citation
In some trucks, when the muffler (muffler) is placed under the chassis from front to back, the end of the tail pipe is rotated 90° and blown down. This protects anyone near the stationary truck from direct exhaust gas impact, but tends to lift dust when the truck is driving on a dry, dusty, untreated surface such as a construction site.

Lake pipes
A consequence of the problematic nature in adaptation of large diameter exhaust tubing to the undercarriage of ladder-frame or body-on-frame chassis architecture vehicles with altered geometry suspensions, lake pipes evolved to become a front-engined vehicle exhaust archetype crafted by specialty motor sport engine specialists of the 1930s, 40s and 50s, whose preoccupation was optimization of the acoustic effect associated with high output internal combustion engines. The name is derived from their use on the vast, empty dry lake beds northeast of Los Angeles County, where engine specialists of yore custom crafted, interchanged and evaluated one-piece header manifolds of various mil thicknesses, a function of temperature, humidity, elevation and climate they anticipated.
No intrinsic performance gain to be derived, per se, lake pipes evolved a function of practicality. Common instances, their manifolds routed straight out the front wheel-whels posing an asphyxiation axiom to the race driver, "lake pipes" were fashioned, extending from the header flange along the rocker panels, bottom-side of the vehicle, beneath the doors, thus allowing (1) suspension tuners a lower ride height sufficient for land speed record attempts, and (2) engine tuners ease and flexibility of interchanging different exhaust manifolds without hoisting the vehicle, thus precluding having to wrench undercarriage of the vehicle.

The body frame structure relies on superleggera, a single and single shell prototype, combined with smoke reduction legislation to make the water pipeline a real performance prerequisite and outdated. For modern vehicles, there is no meaningful performance boost, and the lake channel as a redundant retrograde aesthetic continues into the 21st century, usually with various options for chrome plating, allowing the driver to control whether the exhaust passes through a standard exhaust system or through a lake usually A conduit made of a movement cover that is secured to the end of the exhaust tip by fasteners for (1) "covering" the exhaust system when not in use, and/or (2) signaling the presence of a lake water pipe only cosmetic.

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