The CA engine is a 1.6 L to 2.0 L Inline-4 piston engine from Nissan designed for a variety of smaller Nissan vehicles to replace Z

Nissan Z engine

The Nissan Z series of automobile engines ranged from 1.6 L to 2.4 L and were produced from 1979 through August 1989. The Z series engines retained a nearly identical block to the earlier L Series with the exception of the Z24 which utilized a taller deck height to increase engine...

 and smaller 4-cylinder L

Nissan L engine

The Nissan L series of automobile engines ranged from 1.3 L to 2.8 L in both straight-4 and straight-6 configurations and were produced from 1967 through 1986. This was the engine of the Datsun 240Z sports car as well as the Datsun 510 and the first Nissan Maxima. These engines are known for their...

 series engines. It is an iron block, aluminum head design with a timing belt, thus was cheaper to make than the timing chain setup on the Z and L engines. Earlier versions featured SOHC and 8 valves.