This B18 was a straight-four automobile engine produced by Volvo Cars from 1961 through 1968. The five-bearing, cam-in-block engine, had overhead valves operated by pushrods (OHV). The B18 is quite different in design from its predecessor, the three-bearing B16. A larger 2-litre version called the B20 appeared in 1969.
These engines are reputed to be very durable. The world's highest mileage car, a 1966 Volvo P1800, has run all its more than 4,000,000 km (2,500,000 mi) on its original B18 engine.
Despite their OHV pushrod design, the engines can rev to 6,500 rpm.
The B18 displaced 1.8 L (1778 cc/108 in³) OHV engine and was used in the Volvo PV544, P210 Duett, 120 (Amazon), P1800 and 140 series. The B18 could also be found in the L-3314 and the Bandvagn 202 military vehicles. It was fitted to many Volvo Penta sterndrive marine propulsion systems.It was fitted too in the FACEL-VEGA Facel III.
There are four variations of this engine: