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Ram-air intake

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The ram-air intake works by reducing the intake air velocity by increasing the cross-sectional area of the intake ducting. When gas velocity goes the pressure is increased. The increased pressure in the air box will ultimately have a positive effect on engine output as more oxygen will enter the
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C1 model used a ram-air intake, the very first on any production motorcycle. Ram-air was a feature on some cars in the sixties. It fell out of favor in the seventies, but recently made a comeback. While ram-air intakes may increase the
207:-engineered pressure drop to draw fuel through the main jet. As the pressurised ram-air may kill this venturi effect, the carburetor needs to be designed to take this into account, or, alternatively, the engine may need 235: 159:, to increase the static air pressure inside of the intake manifold on an internal combustion engine, thus allowing a greater massflow through the engine and hence increasing engine power. 495: 178: 430: 488: 1063: 481: 1002: 119: 1157: 53: 680: 100: 57: 72: 977: 561: 1162: 79: 1152: 504: 46: 1113: 1027: 972: 924: 832: 86: 1108: 949: 658: 883: 68: 705: 822: 663: 383: 317: 299: 200: 250: 817: 589: 241: 195: 404: 225:
sensors are used to measure ram pressure which, along with static pressure, is used to estimate the
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At low speeds (subsonic speeds) increases in static pressure are however limited to a few percent.
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An intake design which uses air pressure from vehicle motion to increase static air pressure
167: 1093: 804: 653: 610: 287: 137: 244:, note the ram-air intake mounted on the portside air intake for cooling the jet engine. 959: 929: 784: 551: 208: 204: 172: 1146: 1131: 1022: 1015: 992: 837: 769: 764: 728: 645: 585: 546: 536: 748: 743: 710: 615: 605: 541: 525: 378: 373: 363: 305: 156: 203:
of an engine, they can be difficult to combine with carburetors, which rely on a
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Ram-air systems are used on high-performance vehicles, most often on
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Motorcycle with gooseneck mounted hypercharger air intake
431:"30 Years of Ninjas: 1984 GPz900 Ninja to 1990 ZX-11!" 407:[Aerodynamic system ram-air: operating mode]. 268:
Diagram of piston engine with (from left to right):
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Ram-air

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"Ram-air intake"
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Kawasaki ZX-12R
intake
pressure
ram pressure

Mustang Mach 1

motorcycles
Kawasaki Ninja ZX-11
volumetric efficiency
venturi
fuel-injection
Pitot
airspeed
TA-4SU Super Skyhawk, note the ram-air intake mounted on the portside air intake for cooling the jet engine.
TA-4SU Super Skyhawk
Mikoyan-Gurevich MiG-15

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