Suzuki FB series engine

The Suzuki FB engine is a series of two- and three-cylinder two-stroke engines that was produced by the Suzuki Motor Corporation from October 1961 until November 1987. They were used in a number of Kei-class automobiles and light trucks. From the original air-cooled 359 cc straight-twin version the FB series developed through a number of different models having different names, ending with the water-cooled, three-cylinder LJ50. The names used for various versions of this engine often refer to the chassis code of the cars in which they were introduced, until Suzuki changed their engine naming system sometime in the first half of the 1970s.

The engine was first seen in air-cooled form, equipped with a single carburettor, in the 1961 Suzulight Carry FB. This engine has an alloy block and alloy head, betraying Suzuki's roots as a motorcycle manufacturer. It also received three main bearings. Displacement is 359 cc (21.9 cu in), from a bore and stroke of 61.0 and 61.5 mm. It originally developed 21 PS (15 kW) for this little commercial vehicle. For the June 1965 debut of a modernized Carry, the LC10 engine received Suzuki's new self-lubricating "CCI" system (Cylinder Crank Injection). For the cabover L30 Carry of 1966, a horizontally-mounted version of the engine was developed on which the starter and generator are combined and mounted directly to the front of the crankshaft.

In 1969 a reed valve equipped version with increased power was first offered in the L40 Carry. Power increased to 25 PS (18 kW) at 6000 rpm, with a Solex-style horizontal draught Mikuni 30 PHD carburettor. This engine also equipped the brand new LJ10 Jimny off-roader. A 27 PS (still at 6000 rpm) version of the FB engine, now featuring Suzuki's improved "CCIS" (Cylinder Crank Injection and Selmix) lubrication system, appeared in the Jimny in January 1971 and subsequently in the Carry in April of the same year. Fitted with the same carburettor as before, torque is 3.7 kg·m (36 N·m; 27 lb·ft) at 5000 rpm. This version of the engine weighs 50 kg (110 lb), excluding the transmission. The original air-cooled FB engine was discontinued in August 1972 (when the L40 van was replaced), as water-cooled engines were becoming more popular in the Kei segment.

In 1963, a version for the front-wheel drive Suzulight 360 Van appeared. When intended for a FF layout, the engine was called the FE. The biggest improvement was the introduction of Suzuki's patented "SELMIX" automatic lubrication system. This eliminated the need for pre-mixed gasoline, improving convenience, economy, and reliability. It was also offered as a Standard model ("FEB"), although this did not receive the SELMIX system. Power was 21 PS (15 kW), as for the FB, and this engine also equipped the Suzulight Fronte FEA passenger car. A 22 PS (16 kW) version appeared in October 1965, with the improved "CCI" lubrication system (Cylinder Crank Injection); Vans and Frontes thus equipped are called FE2 and FEA2 respectively.

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Wikipedia