A straight-four engine (also called an inline-four) is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft. S-21 model mount in old polish car Zuk, Nysa, Tarpan and Warszawa. Carburetor, Starter, water pomp, Air and oil filter, manifold and other parts. In my other projects there are (or will) other parts of the car and this engine divided into elements