Cold air intake – Vertical slurry pump EVM-150S – Slurry Pump EMM manufacturer
Advantages
Other advantages to having a cold air intake installed include:
Increased horsepower
Increased torque
Increased throttle response
Improved fuel economy in most cases
Disadvantages
Hydrolock – The intake opening is lower to the ground than a standard air box, and more likely to introduce water into the engine when fording streams or flooded roads. Hydrolock generally does not occur unless the filter is fully submerged in water.”Bypass filters” can be purchased which prevent most water from entering the engine. Some people use hydro shields to prevent this from occurring, however hydro shields are not completely water proof if the intake tube is completely submerged in water.
Noise – Stock air filtration systems usually include resonator based muffling tubes. Removing them reduces pumping losses but increases noise.
Can void the engine warranty – Many auto manufacturers are denying warranty repairs of vehicles that have aftermarket engine modifications. This is especially frequent on pickups with Diesel engines.
Application
Intake systems come in many different styles and can be constructed from plastic, metal, rubber (silicone) or composite materials (fiberglass, carbon fiber or Kevlar). The most efficient intake systems utilize an airbox which is sized to complement the engine and will extend the powerband of the engine. The intake snorkel (opening for the intake air to enter the system) must be large enough to ensure sufficient air is available to the engine under all conditions from idle to full throttle.
The most basic cold air intake replaces the stock airbox with a short metal or plastic tube leading to a conical air filter, called a short ram air intake. The power gained by this method can vary depending on how restrictive the factory airbox is. The placement of the filter is usually directly in the engine compartment, those without a shroud to prevent engine bay it ingestion are known as a “hot air intake”. The overall benefits depend on the specific application. Power may be lost at certain engine speeds, and gained at others. Because of the increased airflow and reduced covering, intake noise is usually increased. This effect is usually amplified on applications where a resonator, a part intended to reduce intake noise on some vehicles, is replaced by the intake.
Well-designed intakes use heat shields to isolate the air filter from the rest of the engine compartment, providing cooler air from the front or side of the engine bay. Some systems called “fender mount” move the filter into the fender wall, this system draws air up through the fender wall from below the car, which provides even more isolation and still cooler air. Carbon fiber can be used for the piping instead of metal, reducing weight and insulating the air from the engine bay in some cases. Carbon fiber and other advanced composites (such as Kevlar) are expensive, and can be more aesthetic rather than functional.
Air bypass valves are gaining popularity in cold air intake manufacturing. An air bypass valve is a filtered spacer that is positioned more into the engine bay, between two connected pieces of the cold air intake assembly. This prevents hydro-locking by providing an alternate route for air to come in, thus eliminating the vacuum that causes water to be sucked in from a puddle. Foam filters are a simple piece of foam that is air permeable, and most have no valve. It is argued that this reduces power, but in actuality it provides more surface area for air to enter the engine when the driver accelerates. When driving at moderate speeds, the suction caused by the engine is not enough to activate the air bypass valve. Cloth filter bypass valves only allow air in if the valve is sucked open as result of the vacuum pressure caused by a blocked filter at the bottom of the intake.
See also
Supercharger
Turbocharger
Booster engine
Warm air intake
Ram-air intake
Air filter
diffuser (automotive)
References
^ The Non-Gearhead’s Guide to Air Intakes
Categories: Automotive technologies | Engine technology | Vehicle modificationHidden categories: Articles lacking sources from July 2008 | All articles lacking sources | Articles that may contain original research from July 2008 | Articles needing cleanup from July 2008 | All pages needing cleanup
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