The G13 is an in line 4 cylinder engine utilizing aluminum alloy for the block, cylinder head and pistons. Displacing 1.3 L (1,324 cc/ cu in) for the G13A and (1,298 cc/79 cu in) for all other G13 engines, fuel delivery is either through a carburetor, throttle body fuel injection or multi-point fuel injection.
This engine was made with different valvetrain designs: 8 or 16 valve SOHC or 16 valve DOHC. All G13 Engines have a bore size of 74 mm. G13A had 77 mm stroke versus 75.5 mm on all other G13 engines.
Read more about this topic: Suzuki G Engine