A tunnel crankcase, tunnel crankshaft or disc-webbed crankshaft[1] is a design feature of a piston engine where the main bearings that support the crankshaft within the crankcase form the largest diameter of any part of the crankshaft and are larger than the crank webs. This requires a crankcase with a large tunnel instead of cross web supports for narrower main bearings, hence the name.
Tunnel crankcases appeared in the 1930s with the first high-speed diesel engines. They were favoured by some makers more than others, notably Saurer in Switzerland[2] and Maybach-Motorenbau GmbH (now MTU) Friedrichshafen. They are described as both 'tunnel crankcases' and 'roller bearing cranks';[2] the two aspects are related and it is unclear as to which gave rise to the other.
^Bolton, William F. (1963). The Railwayman's Diesel Manual (4th ed.). p. 77.
^ abChapman, G.W. (1949). "19: Crankshafts and Main Bearings". Modern High-Speed Oil Engines. Vol. II (2 June 1956 ed.). Caxton. pp. 279–280.
A tunnelcrankcase, tunnel crankshaft or disc-webbed crankshaft is a design feature of a piston engine where the main bearings that support the crankshaft...
In a piston engine, the crankcase is the housing that surrounds the crankshaft. In most modern engines, the crankcase is integrated into the engine block...
100 km (62 mi) cross country. The HL 230 P30 engine was a very compact tunnelcrankcase design, and it kept the space between the cylinder walls to a minimum...
to equip the first 250 Tiger I tanks built, and which had an aluminium crankcase and block. The earlier HL210 engine had a displacement of 21.353 L (1...
to draw any piston blow-by gases from the engine's crankcase. This is known as a positive crankcase ventilation system, in which the gases are burned with...
version of the Audi V8 engine. The 90° V8 has a closed-deck light metal crankcase with dry sump lubrication. The light metal cylinder heads have five valves...
configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from...
V35. Radical when introduced, the design featured horizontally split crankcases and Heron heads. The former was a common feature of contemporary Japanese...
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instead of mounting to an extension of the crankcase, crankcase volume was minimized, resulting in a higher crankcase compression ratio, and more power in proportion...
of the wing covering, the props, and the engine's crankcase, crankshaft, and flywheel. The crankcase, crankshaft, and flywheel of the original engine had...
804 £9,000 +£1,196 25 September 2012 (2012-09-25) 0.24 Work Completed: Crankcase ventilation system fixed by cleaning the oil screen and replacing the...
Landshut accounts for the large cast parts, such as the cylinder head and crankcase, which it does for the production of the six-cylinder in-line engine for...
mixed with air: The fuel-air mixture was then vaporized by heat from the crankcase, forcing it into the cylinders. The propeller drive chains, resembling...
Viper willingly fires into the prisoners, killing Doc, Heavy Metal, Crankcase and Thunder. The survivors injure the Viper with a hidden knife and escape...
top of the cylinders to the bottom of the crankcase. Photo shows underside of crankcase, with part of tunnel crankshaft. The crank webs are circular, supported...
configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel and was commonly used for aircraft engines...
straight-eight-cylinder engine for Alfa Romeo, the 1987 cc P2, with common crankcase and four plated-steel two-cylinder blocks, which won the first World Championship...
exceed Euro IV and possibly Euro V emissions targets. D13A featured closed-crankcase ventilation and also included a new type of unit injector (UI) E3 from...
exhaust. The heat from the fire could cause heating through the transmission tunnel to the interior, melting interior components and potentially causing interior...
involved the crankcase overpressurizing, resulting in lifting of the crankcase relief cover assemblies, as well as displacement of the crankcase exhauster...
point, raise its boiling point, and prevent corrosion. cornering cowling crankcase The housing that surrounds the crankshaft. crankshaft A linear shaft that...
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