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The Mitsubishi Astron is series of straight-4 internal combustion engines, along with Orion, Sirius, and Saturn. Displacement ranges up to 2.6l (one of the largest four cylinder engines of its time). It powered models such as the Mitsubishi Pajero, Mitsubishi Sigma and Mitsubishi Magna.
It employs a chain driven single overhead camshaft (SOHC) and has 8 valves (two per cylinder). In 2.6 L (4G54) Astron II EFI guise (used in the TN Magna) it produced 93kw at 4800 rpm and 205nm at a low 2300rpm.
The Astron featured the first balance shaft system, dubbed "Silent Shaft". The 2.6 was praised for its smoothness and strong low-end torque, but later in its life its power and (never great) economy was eclipsed by newer (many of them DOHC) engines.
4G52
The 4G52 displaces 2.0 L (1995 cc).
4G54
The SOHC 8-valve 4G54 displaces 2.6 L (2555 cc). It was designed for longitudinal use in rear wheel drive and all wheel drive vehicles. The "G54B" engine was also used by Mazda in their 1986-1989 B2600 pickup truck.
4G55
The 4G55 displaces 2.3 L (2346 cc).
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