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 the Z engine and some smaller, four-cylinder L 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 eight valves. The new CA block design was a scaled up E series block with timing shaft and other ancillaries removed.