3A9x family

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(Redirected from 3A90)
3A9x
Overview
Manufacturer MDC Power
Mitsubishi
Layout
Configuration Inline 3
Cylinder block alloy Aluminum die-cast
Cylinder head alloy Aluminum die-cast
Valvetrain Direct acting DOHC, 12 valves, continuously variable MIVEC intake valve timing

The 3A9x family are three cylinder engines which were developed alongside the 4A9x family. They share many similarities with their four cylinder sibling, being an all-aluminum design with chain driven double overhead camshafts, four valves per cylinder (12 in total) and continuously variable MIVEC on the intake camshaft (except for the 1.1 Litre 3A91).

The bore and stroke of each 3A9x model is the same as the corresponding 4A9x model.

The MIVEC used on these engines closes the inlet valves late under light load to reduce pumping losses.

Initially the engine was built at the joint Mitsubishi Daimler-Chrysler facility - MDC Power in Germany from its release in 2003 until 2011 before production moving to Mitsubishi's Kyoto facility from 2012.

3A90

Specifications

Displacement 999cc (1.0 litre)
Bore 75.0mm
Stroke 75.4mm
Compression Ratio 10.5:1
Output 52 kW @ 6000 rpm, 88 Nm @ 5000 rpm

Used in

Sixth Generation Mirage (non Australian market)

3A91

Specifications

Displacement 1124cc (1.1 litres)
Bore 75.0mm
Stroke 84.8mm
Compression Ratio 10.0:1
Output 55 kW @ 6000 rpm, 100 Nm @ 3000 rpm

When used in the Smart, Mercedes refer to the engine as the M134.

Used in

  • Colt Z30 (European market)
  • Smart ForFour (not in Australia)

3A92

Specifications

Displacement 1193cc (1.2 litres)
Bore 75.0mm
Stroke 90.0mm
Compression Ratio 10.5:1
Output 57 kW @ 6000 rpm, 100 Nm @ 4000 rpm

Used in

Sixth Generation Mirage

MITSUBISHI PETROL ENGINES
3 cylinder
3A9x 3A90 3A91 3A92
4 cylinder
Neptune 4G41 4G42
Orion 4G11 4G12 4G13 4G15 4G17 4G18 4G19 G4ED
Sirius 4G61 4G62 4G63 4G64 4G67 4G69
Astron 4G51 4G52 4G53 4G54
Astron II Original Revised
Saturn 4G30 4G31 4G32 4G33 4G37
4G9x 4G91 4G92 4G93 4G94
4A9x 4A90 4A91 4A92
4B1x 4B10 4B11 4B11T 4B12
Inline 6
Saturn 6 6G34
V6
6G7x 6G71 6G72 SOHC 12v 6G72 SOHC 24v 6G72 DOHC Early 6G74 Late 6G74 Ralliart 6G74 6G75
6A1x 6A10 6A11 6A12 6A13
6B3x 6B31
V8
8A80 8A80