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The Holden straight-six motor is a series of straight-six engine that were produced by General Motors–Holden's in Australia between 1948 and 1986. Initially the ''Grey'' motor so dubbed because of the colour of the cylinder block, later motors came in the form of a ''Red'', ''Blue'', ''Black'' and the four-cylinder ''Starfire'' engine. These engines were fitted to all Australian-designed Holdens of the same years, and the four-cylinder ''Starfire'' notably found its way into the Toyota Corona (XT130). The grey motor is a different engine from the others. The ''Red'', ''Blue'', ''Black'' and even the Starfire are all inter-related with many common parts and castings. == Grey == The ''Grey'' motor, built between 1948 and 1962, earned its name as the engine block was painted grey. This overhead valve engine was first fitted to the Holden 48-215 and mated to a three-speed column change gearbox. A three-speed GM ''Roto-Hydramatic 240'' automatic transmission was an option fitted in the latter EK and EJ series. The engine was based on a Buick pre-World War II design, and saw only minor changes throughout its 15-year life. It displaced in its original form as used by the 48-215 (1948), and remaining in use until the FC. Holden replaced the FC in 1960 with the FB series, and its engine was bored out to . It developed at 5000 rpm, providing superior performance to the competing four-cylinder Austin, Morris, Vauxhall and Ford of Britain vehicles. The grey motor featured a compression ratio (7.5:1, low stress design with a view to high reliability. Due to sheer ubiquity, they were popular for racing, and were fitted to many open-wheelers, as well as racing Holdens. With the engines' low-end torque, they also found their way into boats and machinery such as forklift trucks. This engine ran a seven-port non-crossflow cast-iron cylinder head. There were three Siamese (shared) inlet ports for cylinders 1–2, 3–4 and 5–6, two individual exhaust ports for cylinders 1 and 6, and two siamese exhaust ports for cylinders 2–3 and 4–5 in a layout on one side of the head casting. The inlets were fed by a single-barrel Stromberg carburettor in common and fitted with a traditional Kettering ignition by coil and distributor. The electric system was six volts in the 48-215 and FJ. The earliest grey motors (approximately 100,000) were fitted with Delco-Remy accessories, although Lucas and Bosch equivalents throughout the motor’s lifetime replaced these. The very first production grey motor (1948) was number 1001, and they continued in a single sequence until July 1956, when the prefix "L" was introduced.〔Loffler (2006), p. 284〕 The change affected all engines numbered L283373 and above, signifying the 12-volt negative-earth engines as fitted to the all new FE model. The prefix "U" was introduced for motors with the original electricals as fitted to the FJ utility and panel van models, which ended in February and May 1957 respectively. The change was effective from engine U283384.〔 The prefix "B" was introduced and the number sequence reset with the introduction of the displacement engine, and ultimately this was replaced by a "J" prefix for motors fitted to EJ vehicles in 1962. 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「Holden straight-six motor」の詳細全文を読む スポンサード リンク
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