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Mitsubishi Astron engine

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Astron 2
Engine
Manufacturer Mitsubishi
aka {{{aka}}}
Type Petrol
Production/Introduction 1982-1996
Status Discontinued
Displacement 2555 cc
Aspiration Naturally aspirated
Configuration in_line SOHC
Cylinders 4
Fuel System Electronic multi port fuel injection or carburettor.
Lubrification oil pump
Output 127.4 hp @ 4750 rpm
156.5 lb-ft. of torque @ 3750 rpm
Bore 91.1mm
Stroke 98mm
Compression 9.2:1
In. Valves 107.96mm
Ex. Valves 105.86
Firing Order 1-3-4-2
Left Bank {{{Left Bank}}}
Right Bank {{{Right Bank}}}
Length {{{Length}}}
Diameter {{{Diameter}}}
Width {{{Width}}}
Height {{{Height}}}
Dry Weight {{{Dry Weight}}}
Fuel Consumption 11.5/7.6 L/100 km
Emission/s CO: {{{CO}}}
CO2: {{{CO2}}}
NOx: {{{NOx}}}
Hydrocarbon: {{{Hydrocarbon}}}
Particulate: {{{Particulate}}}
Chief Engineer Mitsubishi

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The Mitsubishi Astron 2 engine is a inline 4 cylinder, 2.6 L engine produced by Mitsubishi for use in many cars all over the world between 1982 and 1996.Model names variated depending on applications, but the engine remained basically identical through the world accept the addition of 'jet valves' in the U.S.A.

Contents

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Unique Attributes

The mitsubishi Astron engines were the first production engine to adopt duel balance shafts in an attempt to iron out vibrations caused by bigger 4 cylinder engines. At the time of production, the 'silent shaft' system was a great hit and subsequently saw many car manufactures of the time opt to use the Mitsubishi engine rather than produce their own. A classic example of this is Chrysler 'K-cars'. Another thing that set the Astron family of engines ahead from conventional inline 4 engines of the time was its large size. The 2.6 engine, at the time was the biggest mass produced engine in passenger car history and found its place in many large cars such as the Australian Mitsubishi Magna.

Criticisms

The Astron 2 engine is known for oil leaks and chain rattles. The early engines were worse than later adaptations, because the chain that drives the counterbalance shafts and oil pump was fitted with a manual adjusting chain tensioner, which many mechanics failed to tension properly resulting in slackness and chewed sprockets. Later models used a semi automatic system then a fully automatic system that tensioned the chain using a small hydraulic ram, pressurized by oil pressure. this system was still problematic, especially just after start up. The model used in the Australian Mitsubishi Manga were relatively underpowered considering the weight and size of the car, but proved fairly reliable over the long haul if maintained correctly.

Other problems include oil stem seals, which perish after long hours and let oil run into the cylinder and cause small amounts of blue smoke at start up and after extended periods of idle, such as at traffic lights. The heads used on the Astron 2 are prone to cracking, especially on the Australian Mitsubishi Magna due to the radiator being slightly lower than the head, causing air bubbles to form and the head boiling dry.


Applications

Mitsubishi Magna - 1885 to approximatively 1996 Chrysler 'k-cars' Hyundai passenger cars To name a few


Design quirks and oddities

Duel Counter Balance shafts, Jet Valves (additional inlet valves used in U.S.A to reduce emissions)


See Also

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