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The "Offy" engine was derived from this Miller marine engine An Offenhauser sprint "midget" racer. The Offenhauser engine, familiarly known as the "Offy", was an overhead cam monoblock 4-stroke internal combustion engine developed by Fred Offenhauser and Harry Arminius Miller. [4] Originally, it was sold as a marine engine.
The engine, later known as the "Big Six", was a 336 cu in (5.5 L) DOHC 2 valve-per-cylinder inline six that was fed by a centrifugal supercharger. It was manufactured by Offenhauser with final assembly by Sparks own people. It set fastest qualifying lap at Indianapolis in 1937, but retired due to supercharger problems. [2]: 71, 72
Older heat riser manifolds with 'wet runners' for carbureted engines used exhaust gas diversion through the intake manifold to provide vaporizing heat. The amount of exhaust gas flow diversion was controlled by a heat riser valve in the exhaust manifold, and employed a bi-metallic spring which changed tension according to the heat in the manifold.
The inlet manifold of a reverse-flow cylinder head may be connected to the exhaust by a heat riser to transfer further heat, improving low rpm response and emissions as a result. Costs can be reduced in production engines by casting the inlet and exhaust manifolds as one unit. This also transfers further heat to the inlet eliminating the need ...
It was only mildly modified, fitted with 270 heads solid-lifter camshaft, and Offenhauser intake manifold (with three two-barrel (twin-choke) carburetors). [3] The transmission was a four-speed manual from a Corvette, and the rear axle came from a 1957 Plymouth with a steep 6.17:1 ratio (because of the car's high weight, 4,430 lb (2,010 kg)). [3]
Typically though, a multi-point injected engine has one fuel injector per cylinder, an electric fuel pump, a fuel distributor, an airflow sensor, [5] and, in modern engines, an engine control unit. [6] The temperatures near the intake valve(s) are rather high, the intake stroke causes intake air swirl, and there is much time for the air-fuel ...
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