NA engine
NA20P engine
Overview
Manufacturer	Nissan Machinery
Layout
Configuration	Naturally aspirated Straight-4
Displacement	1.6–2.0 L (1,627–1,998 cc)
Cylinder bore	81.5 mm (3.21 in) 86 mm (3.39 in)
Piston stroke	78 mm (3.07 in) 86 mm (3.39 in)
Valvetrain	SOHC
Combustion
Fuel type	Gasoline Liquefied petroleum gas (in commercial vehicles)
Cooling system	Water-cooled
Output
Power output	76–100 PS (56–74 kW)
Torque output	12.8–17 kg⋅m (126–167 N⋅m; 93–123 lb⋅ft)
Chronology
Predecessor	Z series

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