Mitsubishi 4A3 engine#4A31
{{Infobox automobile engine
| image = Mitsubishi 4A30.jpg
| name = Mitsubishi 4A3 engine
| manufacturer = Mitsubishi Motors
| configuration = Inline-four
| production = 1993–present
| fueltype = Gasoline
| fuelsystem = Electro carburettor
Electronic fuel injection
Direct Injection
| coolingsystem = Water-cooled
| head = Aluminium
| block = Cast iron
| valvetrain = SOHC 4 valves x cyl.
DOHC 5 valves x cyl.
| compression = 8.5:1-11.0:1
| displacement = {{cvt|659-1094|cc|L|1|disp=flip}}
| bore = {{cvt|60|mm|in|2}}
{{cvt|66|mm|in|2}}
| stroke = {{cvt|58.3|mm|in|2}}
{{cvt|80|mm|in|2}}
| power = {{cvt|50-80|PS|kW|0}}
| torque = {{cvt|56-103|Nm|lbft|0}}
| turbocharger = available on 4A30 (659 cc)
}}
The Mitsubishi 4A3 engine is a range of alloy-headed inline four-cylinder engines from Mitsubishi Motors, introduced in 1993 in the sixth generation of their Mitsubishi Minica kei car. It shares a {{convert|72|mm|in|abbr=on}} bore pitch with the 3G8-series three-cylinder engines, but has a considerably shorter stroke so as to stay beneath the 660 cc limit imposed by the Kei class.{{cite web | title = 軽自動車用の4気筒エンジン |trans-title=Kei four-cylinder engines | url = https://a-design-for-life.hatenadiary.org/entry/20140927/1411797831 | date = 2014-09-27 | archiveurl = https://web.archive.org/web/20190708023828/https://a-design-for-life.hatenadiary.org/entry/20140927/1411797831 | archivedate = 2019-07-08 | language = Japanese | work = a-design-for-life }}
A long-stroke, {{cvt|1094|cc|L|1|disp=flip}} version was made available in 1997 for larger-engined kei derivatives, and was subsequently fitted to the Mitsubishi Pistachio, a limited production car based on the kei class Minica equipped with the company's Automatic Stop-Go (ASG) system for cutting the engine when idling. So equipped, the Pistachio was able to record fuel economy figures of {{convert|30|km/L|abbr=on}}.
4A30
Displacement — {{convert|659|cc|L|1|disp=flip|abbr=on}}
Bore x Stroke — {{convert|60x58.3|mm|2|abbr=on}}{{cite web | url = https://mymotorlist.com/engines/mitsubishi/4a30/ | archive-url = https://web.archive.org/web/20231204010017/https://mymotorlist.com/engines/mitsubishi/4a30/ | archive-date = 2023-12-04 | title = Engine Mitsubishi 4A30 | first = El | last = Guardiola | work = MyMotorList.com }}
Fuel type — Unleaded regular gasoline.
A lean-burn variant, using Mitsubishi's "Vertical Vortex" system, appeared on the new, second-generation Pajero Mini in October 1998.{{cite web | url = https://keicars-maniac.com/?p=88906 | archive-url = https://web.archive.org/web/20231204105504/https://keicars-maniac.com/?p=88906 | archive-date = 2023-12-04 | title = 【特別仕様２代目・前期型】三菱 パジェロミニ リンクスVリミテッド（H58A型) | trans-title = Special edition, pre-facelift 2nd generation: Mitsubishi Pajero Mini Lynx V Limited (H58A model) | language = ja | date = 2022-11-25 | work = 軽自動車マニア [Kei Car Mania] }} The new engine cut emissions and fuel consumption by about ten percent, in spite of the new model being marginally larger and heavier.{{cite web | url = https://car-me.jp/articles/17648 | archive-url = https://web.archive.org/web/20240719191942/https://car-me.jp/articles/17648 | archive-date = 2024-07-19 | title = 三菱 2代目パジェロミニ(H53A/H58A型)の長所を紹介！内装はおしゃれでリサイクル可能な素材を使用?! | trans-title = Introducing the merits of the second generation Mitsubishi Pajero Mini (H53A/H58A model)! The interior is stylish and made of recyclable materials?! | language = ja | work = CarMe | publisher = Fabrica Communications Co., Ltd. | first = Yoshida | last = Tsunemichi }}
=659 cc Electronic carburettor (1993)=
- Engine type — Inline 4-cylinder SOHC 16v
- Fuel system — Electronic carburettor
- Compression ratio — 10.0:1
- Power — {{convert|50|PS|kW|0|abbr=on}} at 7500 rpm
- Torque — {{convert|56|Nm|lbft|0|abbr=on}} at 5500 rpm
=659 cc SOHC (1993)=
- Engine type — Inline 4-cylinder SOHC 16v
- Fuel system — Multipoint ECI
- Compression ratio — 10.0:1
- Power — {{cvt|55|PS|kW|0}} at 7000 rpm
- Torque — {{cvt|6.1|kgm|Nm kgm lbft|0|order=out}} at 5000 rpm
=659 cc MVV (1998)=
- Engine type — Inline 4-cylinder SOHC 16v
- Fuel system — Multipoint ECI, lean burn (MVV)
- Compression ratio — 10.0:1
- Power — {{cvt|52|PS|kW|0}} at 6500 rpm
- Torque — {{cvt|6.3|kgm|Nm kgm lbft|0|order=out}} at 4500 rpm
- Production – 1998–2002
=659 cc DOHC 20v turbo (1993)=
- Engine type — Inline 4-cylinder DOHC 20v
- Fuel system — ECI multiple
- Compression ratio — 8.5:1
- Power — {{cvt|64|PS|kW|0}} at 7500 rpm
- Torque — {{cvt|10.2|kgm|Nm kgm lbft|0|order=out}} at 3500 rpm
4A31
Displacement — {{convert|1094|cc|L|1|disp=flip|abbr=on}}
Bore x Stroke — {{convert|66x80|mm|2|abbr=on}}
Fuel type — Unleaded regular gasoline
The regular 4A31 engine met Euro 2 or 3 emissions standards, depending on model and year, while the GDI version was capable of Euro 4.{{cite web | url = https://mymotorlist.com/engines/mitsubishi/4a31/ | archive-url = https://web.archive.org/web/20240909015329/https://mymotorlist.com/engines/mitsubishi/4a31/ | archive-date = 2024-09-09 | title = Engine Mitsubishi 4A31 | first = El | last = Guardiola | work = MyMotorList.com }}
=1094 cc SOHC (1997)=
;Engine type: Inline 4-cylinder SOHC 16v
;Fuel system: ECI multiple
;Compression ratio: 9.5:1
;Power: Pajero Junior: {{cvt|80|PS|kW|0}} at 6000 rpm
: Toppo BJ Wide: {{cvt|78|PS|kW|0}} at 6000 rpm
: Town Box Wide: {{cvt|75|PS|kW|0}} at 6000 rpm
;Torque: Pajero Junior: {{cvt|10.0|kgm|Nm lbft|0|order=out}} at 4000 rpm
: Toppo BJ Wide: {{cvt|10.5|kgm|Nm lbft|0|order=out}} at 4000 rpm
: Town Box Wide: {{cvt|10.2|kgm|Nm lbft|0|order=out}} at 4000 rpm
=1094 cc GDI (1999)=
;Engine type: Inline 4-cylinder DOHC 16v
;Fuel system: GDI Direct Injection
;Compression ratio: 11.0:1
;Power: {{cvt|74|PS|kW|0}} at 6000 rpm
;Torque: {{cvt|100|Nm|lbft|0}} at 4000 rpm
See also
{{commonscat|Mitsubishi 4A3 engines}}
References
{{reflist}}
{{Mitsubishi Motors technologies}}
{{DEFAULTSORT:Mitsubishi 4a3 Engine}}