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The 8A80 is a 90 degree V8 engine designed by Mitsubishi which entered production in 1999. The engine displaces 4.5 litres and has belt-driven double overhead camshafts with 4 valves per cylinder.

The 8A80 has a bore of 86.00mm and a stroke of 96.80mm. Compression uses a 10.7:1 ratio.

The 8A80 features an aluminium block and aluminum heads (a first for any Mitsubishi vee-engine) and weighs only 230 Kg (including exhaust manifolds and catalytic convertors), just 10 Kg heavier than the 6G72 3.0 litre V6.

To maximise power, and minimise fuel economy, the 8A80 uses Gasoline Direct Injection technology, where fuel is injected directly into the combustion chamber. This allows for an extremely lean fuel mixture when the engine is under little load.

The actual power of the engine is limited to 206 kW, due to the Japanese Gentlemen's handshake power agreement. Torque is rated at 412 Nm.

As part of the Global Engine Manufactuing Alliance (GEMA), engine components are manufacturted by both Mitsubishi and Hyundai and shared between the two companies. Mitsubishi produces the cylinder heads and direct injection equipment while Hyundai produces the cylinder block, pistons and conrods. The engine however, has only been fitted to the Mitsubishi Proudia and Dignity from 1999 until 2001. The Proudia/Dignity's Hyundai Equus sister has been the sole use of the engine since 2001. All three vehicles have only been available in their domestic markets of Japan and South Korea respectively.

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
6G7x 6G71 6G72 SOHC 12v 6G72 SOHC 24v 6G72 DOHC Early 6G74 Late 6G74 Ralliart 6G74 6G75
6A1x 6A10 6A11 6A12 6A13
6B3x 6B31
8A80 8A80