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Straight six engine : ウィキペディア英語版
Straight-six engine

The straight-six engine or inline-six engine (often abbreviated I6 or L6) is an internal combustion engine with the cylinders mounted in a straight line along the crankcase with all the pistons driving a common crankshaft (straight engine).
The bank of cylinders may be oriented at any angle, and where the bank is inclined to the vertical, the engine is sometimes called a slant-six. The straight-six layout is the simplest engine layout that possesses both primary and secondary mechanical engine balance, resulting in much less vibration than engines with fewer cylinders.〔Nunney, pp. 12-13〕
==Displacement range==
In automobiles, the straight-six design is used for engine displacements ranging from approximately .〔Cheetham, p. 209〕 It is also sometimes used for smaller engines but these, although very smooth running, tend to be rather expensive to manufacture in terms of cost-to-power ratio. Since the length of an engine is roughly proportional to the number of cylinders in one bank, the straight-six is necessarily longer than alternative layouts such as I4, V4, V6, or V8.
One of the smallest production straight-sixes was found in the Benelli 750 Sei motorcycle, displacing (0.7477 L). Honda and Mike Hailwood raced in the 1960s with the RC166 (0.25 L) six-cylinder, 24-valve motorcycle engine. Pre-World War II engines could be quite large by modern standards — such as the Rolls Royce Silver Ghost's 7.4 L engine and the 824 cu in  (13.5 L) of the 1910s Peerless, Pierce, and Fageol.
The largest modern passenger-car straight-sixes include the VAM version of AMC's engines, the 4.2 litre powerplants found in several Jaguars and AMCs, 4.0 TVR Speed Six, 4.0 Ford Barra, Chevrolet 250, Chevrolet Vortec 4200, 4.3 Chrysler Hemi Six, 4.2 Toyota Land Cruiser (both diesel and petrol), 4.5, and 4.8 Nissan, 4.8 Chevrolet, 4.9 Ford, and the 5.0 L of Hudson H-145 (produced until 1957). As of 2009, the Cummins B Series engine used in Dodge Ram pickup trucks displaced up to 6.7 L
The Gipsy Six and Gipsy Queen, made by the de Havilland Engine Company from 1935 until 1950, were inverted straight-six engines displacing . They were used in a variety of aircraft including the de Havilland Dragon Rapide and the Cierva W.9 experimental helicopter. The standard straight-six configuration World War I aviation engines used by the German Empire's ''Luftstreitkräfte'' aircraft possessed even larger displacements, with the most-used Mercedes D.III family of liquid-cooled, dual ignition, SOHC-valvetrain inline-six engines having a massive 14.8 litre {903 cu. in.] displacement.
Because it is a fully balanced configuration, the straight-six can be scaled up to very large sizes for heavy truck, industrial and marine use, such as the Volvo diesel engine and the 15 L Cummins ISX used in heavy vehicles.〔Nunney, p. 4〕 The largest are used to power ships, and use fuel oil. The straight-six can also be viewed as a scalable modular component of larger motors which stack several straight-sixes together, e.g. flat- or V-12s, W-18s, etc.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Straight-six engine」の詳細全文を読む



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