Daihatsu A-series engine 1

Daihatsu A-series engineThe Daihatsu A-series engine is a range of compact two-cylinder, internal combustion piston engines, designed byDaihatsu with the aid of their owner Toyota. The petrol-driven series has cast iron engine blocks and aluminumcylinder heads, and are of an SOHC lean burn design, with belt driven heads. The head design was called "TGPlean-burn", for "Turbulence Generating Pot".[] The engine also had twin-balancing shaft, which provided smoothnessequivalent to that of a traditional four-cylinder engine - although it also cost nearly as much to build.[]

The engine was developed with some haste in order to replace the dirty two-stroke "ZM" engines used in Daihatsu'searlier Kei cars, and was the first unit to take full advantage of the new 550 cc displacement limit in effect from 1January 1976. It was first presented in May 1976, as the AB10.[1] Eventually, even a turbocharged version wasproduced.[2] The engine was replaced by the three-cylinder EB-series in 1985.[]

AB-series (547 cc)The AB-series is a 547 cc (0.55 L) version originally installed into the 1976 Fellow Max 550 but soon found its wayinto Daihatsu's entire Kei car lineup. Bore is 71.6 mm and stroke is 68 mm. Unlike the export versions, the Japanesemarket engines have a small catalyzer fitted.[] The engine (AB20) was also installed in the tiny PortugueseEntreposto Sado 550 citycar, of which about 500 were built in the early eighties.[] Surprisingly, Daihatsu's closecompetitor Suzuki fitted AB10 engines into their Suzuki Fronte 7-S for a short period, as their own two-strokeengines had a hard time meeting ever stricter emissions requirements.[]

AB10 is the code used for engines meant to be installed in an upright position, while those intended for a horizontalposition (for underfloor usage) are called AB20. The AB55 is a horizontal version equipped with a turbocharger.Applications:• 1976.05–1977.06 Daihatsu Fellow Max 550 (L40/L40V)• 1977.06–1980.06 Daihatsu Max Cuore/Cuore (L45/L40V)• 1980.06–1985.08 Daihatsu Cuore/Mira (L55/L55V)• 1976.04–1980.04 Daihatsu Hijet (S40)• 1977.04–1981.04 Daihatsu Hijet (S60)• 1982–1984 Sado 550 (Portugal)• 1977.06–1978 Suzuki Fronte 7-S (SS11)

Power Torque Norm Comp. Fuelsystem

Cat Fitment Notes

PS kW at rpm kgm Nm lbft atrpm

Daihatsu A-series engine 2

AB-10 4VSOHC

28 21 6,000 3.9 38 28 3,500 JIS carb ● Fellow Max 550(L40/L40V),[] MaxCuore (L45/L40V),Suzuki Fronte 7-S(SS11)

AB-30 29 21 4.0 39 29 3,500 9.2 – Cuore Van (L40V),Mira/Mira Cuore(L55V)

Commercialsonly

31 23 4.2 41 30 3,500 ● Cuore (L45), Cuore(L55)

AB-31 30 22 1 10 7 ?? ? Mira/Mira Cuore(L55V)[2]

AB-?? 27 20 4.5 44 33 3,500 DIN 9.2 – Cuore Van (L40V),Mira/Mira Cuore(L55V)

Export version

AB-35 41 30 5.7 56 41 2,500 JIS 8.2 turbo Mira Turbo(L55V)[]

IHIturbocharger

AB-20 28 21 5,500 4.0 39 29 3,500 carb Hijet 550 (S40),Hijet Wide 550(S60), Sado 550

28 21 5,500 4.2 41 30 3,500 Hijet 550 (S65/66),Hijet Atrai (S65/66,81.04-82.03)

AB-50 29 21 5,500 4.4 43 32 3,500 ● Hijet Atrai (S65/66,82.04-83.09)[]

horizontallymounted,passenger caremissions

AB-51 29 21 5,300 4.5 44 33 3,500 Atrai (S65/66,83.09-86.03)

modified carb,advancedignition[]

AB-55 39 29 5,500/5,300 5.9 58 43 3,000 turbo Atrai Turbo(S65/66,83.10-86.03)

max power atlower rpm from1984.02

AD-series (617 cc)The AD-series is a 617 cc (0.62 L) version of the AB-series engine. This somewhat larger engine does not meet Keicar regulations and was intended only for export markets. Only the Daihatsu Cuore was ever fitted with this engine,although they were often sold as the "Domino" in export markets. Bore is 76 mm and stroke is 68 mm.[] The onlyversion was an SOHC, two-valve, single carburetted unit.

References[1] Baobab Street, Enjoy, p. 130[2] Baobab Street, Enjoy, p. 133

Works cited

Baobab Street (バ オ バ ブ ス ト リ ー ト) (1987) (in Japanese). エ ン ジ ョ イ ・ ダ イ ハ ツ ミ ラ,ク オ ー レ/リ ー ザ [Enjoy Daihatsu Mira, Cuore/Leeza]. マ イ カ ー エ ン ジ ョ イ マ ニ ュ ア ル

[My Car Enjoy Manual]. Tokyo: Sankaido (山 海 堂). ISBN 978-4-381-07561-1.

Article Sources and Contributors 3

Article Sources and ContributorsDaihatsu A-series engine  Source: http://en.wikipedia.org/w/index.php?oldid=536855467  Contributors: Magioladitis, Mr.choppers, Nordwind32, Rjwilmsi

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