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Suzuki FB series engine

From Wikipedia, the free encyclopedia

Suzuki Motor Corporation logo.svg
FB series
Suzuki Jimny LJ20 engine room.jpg
ConfigurationStraight-2, Straight-3
  • 359 cc (21.9 cu in)
  • 443 cc (27.0 cu in)
  • 446 cc (27.2 cu in)
  • 539 cc (32.9 cu in)
Cylinder bore
  • 61 mm (2.4 in)
  • 68 mm (2.68 in)
Piston stroke61.5 mm (2.42 in)
Block materialAlloy
Head materialAlloy
Compression ratio5.9:1, 6.0:1
Fuel systemMikuni-Solex Carburettor
Fuel typeGasoline
Oil systemCCI SELMIX automatic lubrication
Cooling system
Power output21–29 PS (15.4–21.3 kW)
Torque output3.7–5.7 kg⋅m (36–56 N⋅m; 27–41 lb⋅ft)

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 (21.9 cu in) 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.

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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 mm × 61.5 mm (2.40 in × 2.42 in).[1] It originally developed 21 PS (15.4 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 (18.4 kW) at 6000 rpm,[2] with a Solex-style horizontal draught Mikuni 30 PHD carburettor.[3] This engine also equipped the brand new LJ10 Jimny off-roader. A 27 PS (19.9 kW) (still at 6000 rpm) version of the FB engine, now featuring Suzuki's improved "CCIS" (Cylinder Crank Injection and Selmix) lubrication system,[4] 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.[5] This version of the engine weighs 50 kg (110 lb), excluding the transmission.[6] 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.[7]



In 1963, a version for the front-wheel drive Suzulight 360 Van appeared.[8] 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.[9] Power was 21 PS (15.4 kW), as for the FB, and this engine also equipped the Suzulight Fronte FEA passenger car. A 22 PS (16.2 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.

In 1967 the all new three-cylinder Fronte 360 replaced the FEA. A year later, in March 1968, the Van received a reed valve engine for the FE3 model.[10] This was discontinued in January 1969, when the three-cylinder Fronte Van appeared. In May 1963, two of the recently introduced FE-powered Suzuki Frontes[11] came in first and second in their class at the inaugural Japanese Grand Prix (Class C1, for engines with less than 400 cc), with an average speed of 89.763 km/h (55.776 mph).[12][13] Two more Frontes came in fourth and eighth places.[14] The winning driver was Osamu Mochizuki (望月 修) who crossed the finish line just ahead of teammate Haruhisa Fujita (藤田 晴久), both a full minute ahead of the third-placed Subaru 360.[15]



A water-cooled version of the FB, called the L50 since it was developed for the L50 Carry, appeared in March 1972 in the LJ20 Jimny. Power increased to 28 PS (20.6 kW) at 5500 rpm, with torque up to 3.7 kg⋅m (36 N⋅m; 27 lb⋅ft) at 5000 rpm. The L50 was only ever fitted to commercial vehicles as Suzuki's passenger cars were by now using the three-cylinder LC10 engine. The L50 was also fitted to the short-lived LS20 Fronte Van for just over a year.[16] It continued to be used in the Fronte Van's replacement, the 1973 "Fronte Hatch". The early version weighed 43 kg (95 lb).[17]

In December 1974 an emissions scrubbed version of the L50 appeared in all applications; this version lost two horsepower for a new total of 26 PS (19.1 kW) at the same engine speed, with torque increased to 3.8 kg⋅m (37 N⋅m; 27 lb⋅ft) at a lower 4500 rpm. This was also ready for the unleaded gasoline introduced to the Japanese market on 1 February 1975. For 1976 another horsepower was lost. With new rules for Kei cars, allowing for engines of up to 550 cc, the L50 gained a cylinder and a new name in April 1976. The two-cylinder version was finally discontinued in July, when the Suzuki Fronte Hatch was also updated.



The L60 was a rare, export-only version with a larger displacement. Like the L50, it is a water-cooled two-stroke twin, but has 446 cc (27.2 cu in) from a 68 mm × 61.5 mm (2.68 in × 2.42 in) bore and stroke. Appearing only in the L60 Carry, it was fitted to provide more power and torque to export markets not having regulations regarding engine size. Power is 29 PS (21.3 kW), rather than the 26 PS (19.1 kW) offered by the contemporary 360 in export trim.[18]



The LJ50 engine, with a 6.0:1 compression ratio, 33 hp (24.6 kW) at 5500 rpm and 5.7 kg⋅m (56 N⋅m; 41 lb⋅ft) at 3500 rpm, was first introduced in September 1975 for export market Suzuki Jimnys, which were usually marketed simply as the "Suzuki LJ50". In export market Carrys it has a somewhat lower compression ratio of 5.9:1 and this version develops 30 hp (22.4 kW) at 4500 rpm and 5.5 kg⋅m (54 N⋅m; 40 lb⋅ft) at 3000 rpm. It first appeared for the home market in June 1976 as the Jimny 55, subsequent to the changing of Kei car rules while also addressing stricter emission standards. The 539 cc (32.9 cu in) straight-three engine remained a two-stroke; while power remained 26 PS (19.1 kW) at 4500 rpm more low-end torque was on offer - 5.3 kg⋅m (52 N⋅m; 38 lb⋅ft) at 3000 rpm.[19] Both figures are at considerably lower engine speeds.

Still water-cooled and with a bore and stroke of 61 mm × 61.5 mm (2.40 in × 2.42 in), this was largely an L50 engine with an extra cylinder added. The LJ50 was also fitted to several generations of the Carry microtruck and van, until July 1986.


T5 series

In response to the changed Kei car regulations taking effect on January 1, 1976, Suzuki developed the T5A, a version for passenger car use; this meant that the engine had to pass stricter emissions regulations than the LJ50. The unrelated T4A engine was unable to do this and was also of only 443 cc (27.0 cu in), so it was replaced in October 1977. The name refers to it being the first ("A") engine with a 0.5-litre displacement. From its 539 cc (32.9 cu in) it provided 28 PS (20.6 kW) at 5000 rpm and 5.3 kg⋅m (52 N⋅m; 38 lb⋅ft) at 3000 rpm.[21] At the same time, this engine (with the same power specifics) was also fitted to the sporting looking Suzuki Cervo microcoupé.[22] This could finally meet the tighter 1978 (53年) emissions standards, which the T4A had not been able to do. The emissions system was called "TC53", for Twin Catalyst, year 53 of the Showa era (1978 in the common era).

In May 1979 the T5B appeared, simply a T5A engineered to be installed in a front-engine, front-wheel-drive layout. As for specifications, the only difference was that maximum power was now reached at 5500 rpm.[23] This was installed in the all-new Alto/Fronte hatchback, alongside a new four-stroke engine called the F5A. In 1981 the T5B was discontinued, although the LJ50 sister version continued to be built until late 1987.


See also


  • 360cc: Light Commercial Truck 1950-1975 (360cc 軽商用貨物自動車 1950-1975) (in Japanese). Tokyo: Yaesu Publishing. 2009. ISBN 978-4-86144-139-4.
  • 360cc: Nippon 軽自動車 Memorial 1950→1975 [Nippon Kei Car Memorial 1950-1975] (in Japanese). Tokyo: Yaesu Publishing. 2007. ISBN 978-4-86144-083-0.
  • Ozeki, Kazuo (2007). Suzuki Story: Small Cars, Big Ambitions (in Japanese). Tokyo: Miki Press. ISBN 978-4-89522-503-8.
  1. ^ Ozeki, p. 28
  2. ^ Ozeki, p. 97
  3. ^ Suzuki Service Manual: Carry L40/L41/L40V (Manual), Hamamatsu, Japan: Suzuki Motor Co. Ltd., 1970, p. 27
  4. ^ Car Graphic: Car Archives Vol. 5, '70s Japanese Cars (in Japanese). Tokyo: Nigensha. 2007. p. 145. ISBN 978-4-544-09175-5.
  5. ^ World Cars 1972. Bronxville, NY: L'Editrice dell'Automobile LEA/Herald Books. 1972. p. 383. ISBN 0-910714-04-5.
  6. ^ Carry L40/L41/L40V (manual), p. 8
  7. ^ Ozeki, p. 98
  8. ^ Schaefers, Martin. "History of Suzuki Kei Jidosha". Far East Auto Literature. Retrieved 2010-11-07.
  9. ^ Sasaki. "Suzulight" スズライト [Suzulight]. ささとも [Sasatomo] (in Japanese). Retrieved 2013-06-18.
  10. ^ Light Commercial Truck, p. 43
  11. ^ 大会詳細結果 [Detailed race results] (in Japanese). Japan Automobile Federation. Retrieved 2013-09-27.
  12. ^ Ozeki, p. 25
  13. ^ モノづくりの現場から -第29回- [From the manufacturing field, no. 29]. JAMAGAZINE (in Japanese). Japan Automobile Manufacturer's Association (JAMA). May 2006. Archived from the original on 2013-10-02. Retrieved 2013-09-27.
  14. ^ "1963年 スズライト フロンテ FEA" [1963 Suzulight Fronte FEA] (in Japanese). Archived from the original on 2013-10-02. Retrieved 2013-09-27.
  15. ^ 競技結果: 第1回日本グランプリ自動車レース大会 [Competition Results: 1st Japan Grand Prix motor racing tournament] (in Japanese). Japan Automobile Federation. Retrieved 2013-09-27.
  16. ^ Suzuki Fronte Van (catalog), Suzuki Motor Corporation, 1972
  17. ^ Suzuki LJ20 Service Manual (PDF), Hamamatsu, Japan: Suzuki Motor Co, March 1973, p. 18
  18. ^ New Model Technical Bulletin: Suzuki L60/L61/L61V Truck and Van. Suzuki Motor Company. September 1975. NT7110.
  19. ^ 自動車ガイドブック [Automobile Guide Book] (in Japanese). Japan: Japan Automobile Manufacturers Association. 23: 184. 1976-10-20. 0053-760023-3400. Missing or empty |title= (help)
  20. ^ a b MX41. スズキキャリイの軌跡(の一部) [Trajectory of the Suzuki Carry (part)]. ボール紙の車庫(仮)[Cardboard Box Garage] (in Japanese). Retrieved 2013-09-26.
  21. ^ Freund, Klaus, ed. (1978). Auto Katalog 1979. 22. Stuttgart: Vereinigte Motor-Verlage GmbH & Co. KG. pp. 204–205.
  22. ^ 70's Car Archives, p. 144
  23. ^ 70's Car Archives, p. 143
This page was last edited on 13 December 2019, at 17:01
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