| NA engine | |
| Manufacturer: | Nissan Machinery |
| Predecessor: | Z series |
| Configuration: | Naturally aspirated Straight-4 |
| Valvetrain: | SOHC |
| Fueltype: | Gasoline Liquefied petroleum gas (in commercial vehicles) |
| Coolingsystem: | Water-cooled |
| Displacement: | NaNcc |
| Bore: | 81.5mm 86mm |
| Stroke: | 78mm 86mm |
| Power: | NaN0NaN0 |
| Torque: | NaN0NaN0 |
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.
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.[1]
This fuel injected, LPG-powered variant was introduced in September 2010 and met new, stricter emissions regulations.