Multiple carburetor barrels

Multiple carburetor barrels

Multiple carburetor barrelsMultiple carburetor barrels

While basic carburetors have only one venturi, many carburetors have more than one venturi, or "barrel". Two barrel and four barrel configurations are commonly used to accommodate the higher air flow rate with large engine displacement. Multi-barrel carburetors can have non-identical primary and secondary barrel(s) of different sizes and calibrated to deliver different air/fuel mixtures; they can be actuated by the linkage or by engine vacuum in "progressive" fashion, so that the secondary barrels do not begin to open until the primaries are almost completely open. This is a desirable characteristic which maximizes airflow through the primary barrel(s) at most engine speeds, thereby maximizing the pressure "signal" from the venturis, but reduces the restriction in airflow at high speeds by adding cross-sectional area for greater airflow. These advantages may not be important in high-performance applications where part throttle operation is irrelevant, and the primaries and secondaries may all open at once, for simplicity and reliability; also, V-configuration engines, with two cylinder banks fed by a single carburetor, may be configured with two identical barrels, each supplying one cylinder bank. In the widely seen V8 and 4-barrel carburetor combination, there are often two primary and two secondary barrels.

The spread-bore 4-barrel carburetor, first released by Rochester in the 1965 model year as the "Quadrajet"[citation needed] has a much greater spread between the sizes of the primary and secondary throttle bores. The primaries in such a carburetor are quite small relative to conventional 4-barrel practice, while the secondaries are quite large. The small primaries aid low-speed fuel economy and drivability, while the large secondaries permit maximum performance when it is called for. To tailor airflow through the secondary venturis, each of the secondary throats has an air valve at the top. This is configured much like a choke plate, and is lightly spring-loaded into the closed position. The air valve opens progressively in response to engine speed and throttle opening, gradually allowing more air to flow through the secondary side of the carburetor. Typically, the air valve is linked to metering rods which are raised as the air valve opens, thereby adjusting secondary fuel flow.

Multiple carburetors can be mounted on a single engine, often with progressive linkages; two four-barrel carburetors were frequently seen on high performance American V8s, and multiple two barrel carburetors are often now seen on very high performance engines. Large numbers of small carburetors have also been used (see photo), though this configuration can limit the maximum air flow through the engine due to the lack of a common plenum; with individual intake tracts, not all cylinders are drawing air at once as the engine's crankshaft rotates[4].


ganti kode adsense 336x280

0 komentar:

Post a Comment

Related Posts with Thumbnails

Labels

'Cuda Acabion Acura adler Air Cooler Akrapovic Morsus Alfa Romeo Alpina Racing aprilia article asbestos Aston Martin Audi Big Foot BIMOTA BMW brabus Bugatti BYD Camaro car tuning Car Wallpaper carbon motor carburator cbr cewek knalpot Chevrolet Chevrolet Camaro Chevy Chevelle Citroen civic Civic Wallpaper classic bike classic car coda automotive concept bike concept car Corvette Crazy Biker crossover daihatsu dodge Dodge Challenger Dodge Charger Donkervoort Drag Car Engine Ducati Duesenberg Dyno Don El Rey electric car Electric Motorcycle engine exhaust back box exhaust system Fastest Cars FB Corse Ferrari fiat fisker automotive flier Ford Ford Mustang friendly car GEM Giugiaro Namir GM green techno GTA Spano Hamann Harley-Davidson holden Honda honda vario hot girls hot rod Hybrid Car Hyundai ilmor Injection System Jaguar jay fowler jeep Jet Car jupiter mx Jupiter Z1 K1 Attack Spider kawasaki KTM Lamborghini LEXUS marcedes-benz mazda Mercedes Mitsubishi modief Mustang my friend Nissan NOS Oil Change old car Peugeot pink car Police car pontiac Porsche quad rear R Mission Electric Motorcycle rat bikes red bull Replica S2000 saab saba SABA motors scion Sexy bikes sexy car shelby sport bike sport car Spyker Car stainless steel exhaust Subaru subura super car Suzuki suzuki spin tanggo commuter cars Techno Classica Essen tesla motor think Three-Wheeled Vehicle Toyo Tires toyota Triumph Truck Tundra Midnight Rider Tailgater Turbo tvs venturi Viper vmax Volvo VW vyrus Wakan Motorcycle wallpaper Wartburg Concept wheego electric car Wheelie Car wiesmann world racing Wrightspeed X1 Yamaha Yamaha vixion Zagato Zenvo ST-1
 
© 2011 me and automotive | Designs By Bhambank Mbambong Blog | Powered by Blogger