The Nissan NA family of straight-four engines is a series of engines manufactured by Nissan (Nissan Machinery). It is the replacement of the Z series, on which its design is based, and is mostly used in commercial vehicles due to its use of Liquefied petroleum gas for fuel on engines with a "P" suffix code.

• Engine type: 1.6 L (1,627 cc), 81.5 mm × 78 mm (3.21 in × 3.07 in) bore and stroke, SOHC^[1]
• Output: 76 PS (56 kW) at 5,000 rpm
• Torque: 12.8 kg⋅m (126 N⋅m; 93 lb⋅ft) at 3,200 rpm

• 1989–1995 Datsun Truck D21 73 PS (54 kW)^[1]
• 1990–1995 Nissan Atlas F22 - F23

• Engine type: 2.0 L (1,998 cc), 86 mm × 86 mm (3.39 in × 3.39 in) bore and stroke, SOHC, carburetted
• Output: 82 PS (60 kW) at 4,600 rpm
• Torque: 16.2 kg⋅m (159 N⋅m; 117 lb⋅ft) at 2,400 rpm

In 1998 the NA20P was updated, with redesigned combustion chambers which increased power and torque while lowering fuel consumption. A new catalyst reduced emissions, making it the first LPG-engined passenger car to be designated a low-pollution vehicle in several Japanese cities and prefectures.^[2]

• Output: 85 PS (63 kW) at 4,600 rpm
• Torque: 17 kg⋅m (167 N⋅m; 123 lb⋅ft) at 2,400 rpm

• 1991–2010 Nissan Cedric Y31
• 1993–2009 Nissan Crew K30
• 1991–1999 Nissan Gloria Y31

This fuel injected, LPG-powered variant was introduced in September 2010 and met new, stricter emissions regulations.

• Engine type: 2.0 L (1,998 cc), 86 mm × 86 mm (3.39 in × 3.39 in) bore and stroke, SOHC, multi-point fuel injection
• Output: 85 PS (63 kW) at 4,400 rpm
• Torque: 17.3 kg⋅m (170 N⋅m; 125 lb⋅ft) at 2,400 rpm

• 2010–2014 Nissan Cedric Y31

• Engine type: 2.0 L (1,998 cc), 86 mm × 86 mm (3.39 in × 3.39 in) bore and stroke, SOHC^[1]
• Typical output: 100 PS (74 kW) at 5,000 rpm
• Torque: 17 kg⋅m (167 N⋅m; 123 lb⋅ft) at 3,000 rpm

• 1989-1999 Datsun Truck D21, 91 PS (67 kW) at 5,000 rpm^[1]
• 1990–1999 Nissan Atlas F22 - F23
• 1990–1999 Nissan Atlas H40
• 1990–1999 Nissan Homy / Nissan Caravan E24