Engine: Description and Operation

This engine is an in-line 4-cylinder SOHC design displacing 2,156 cm3 (131.5 cubic inch). It is water cooled and equipped with a center plug type pent-roof combustion chamber. It is specified to use unleaded fuel and uses a Sequential Multiport Fuel Injection (PGM-FI) system. This engine incorporates a mechanism called Variable Valve Timing and Valve Lift Electronic Control (VTEC) System. This system allows the timing and lift of the intake valves to be changed simultaneously.

Main Features:
- The cylinder head is made of aluminum alloy, a center plug type, pentroof-shaped combustion chamber is used, and the 4-valve system uses 2 intake valves and 2 exhaust valves.
- The camshaft and the valve train are driven by a timing belt, and the two balancer shafts are driven by a timing balancer belt.
- The cylinder block is made of aluminum alloy using cast iron sleeves.
- The crankshaft is made by forging, is supported at five points and has eight balancer weights.
- The balancer shafts employ a gear-type reverse mechanism to reduce secondary engine vibration.
- The intake manifold is made of aluminum alloy.
- The electronic fuel injection system is a sequential multiport type. It injects fuel into all four cylinders. The throttle body is a one-barrel, side-draft type.
- The ignition system is a fully-transistorized, contactless type. The spark advance is electronic.
- The air cleaner is equipped with a resonator.
- The radiator is a corrugated type, and the cooling fan is electrically powered.