Volvo B18 engine
|Displacement||1778cc - 1986cc|
|Cylinder block alloy||Cast iron|
|Cylinder head alloy||Cast iron|
|Fuel system||Carburetor or Fuel Injection|
|Oil system||Wet sump|
|Cooling system||Water cooling|
|Predecessor||Volvo B4B engine|
|Successor||Volvo Redblock Engine|
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.
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 alto fitted in the FACEL-VEGA Facel III and the Marcos 1800 GT.
There are four variations of this engine:
- B18A: single carburetor version - 75 HP SAE
- B18B: dual carburetor version - 100 and 115 HP SAE with a higher compression ratio, fitted variously with dual SU or Zenith/Stromberg sidedraft carburetors
- B18C: single carburetor version - 40 HP SAE with a lower compression ratio and 2500 RPM mechanical regulator, fitted in the gasoline powered versions of the Volvo BM 320 tractor
- B18D: dual SU carburetor version - 90 and 95 HP SAE
The B20 was produced from 1969 to 1981. All B20 engines displaced 2.0 L (1986 cc/121 in³) via an 88.9 mm (3.5 in) bore X 80 mm (3.1 in) stroke on 105/108mm split bore centers (2&3 are wider apart than 1&2 and 3&4). The B20 engine was used in the Volvo 120, 1800, 140, C202 and 240 series, and also in the Haubits 77 Bofors howitzer. The design is virtually identical to the predecessor B18, simply with an enlarged 88.9mm (3.5") bore, thus most parts are functionally interchangeable, albeit with running changes to the manufacture & design of components.
There are five variations of this engine:
- B20A: 8.7:1 Compression. Single carburetor version - 82 hp. First produced 1969
- B20B: 9.5:1 Compression. Dual carburetor version - 118 hp with a higher compression ratio, fitted variously with dual SU or Zenith/Stromberg sidedraft carburetors. First produced 1969
- B20D: 8.7:1 Compression. Dual carburetor version - 105 hp up to 1971 then 110 hp from 1972 with a lower compression ratio, fitted variously with dual SU or Zenith/Stromberg sidedraft carburetors. First produced 1969
- B20E: 10.5:1 Compression. Electronic D-Jetronic Fuel Injection up to 1973 then Mechanical K-Jetronic Fuel Injection from 1974 - 130 to 135 hp. First produced 1970.
- B20F: 8.7:1 Compression. Electronic D-Jetronic Fuel Injection up to 1973 then Mechanical K-Jetronic Fuel Injection from 1974- 118 hp. First produced 1972 for lower emissions.
In 1974 the number of bolts holding the flywheel increased from 6 to 8 and the size of the connecting rod was increased. From 1975 the thread standard changed from SAE to Metric as Volvo switched over with the new 200 series.
The B20A was revived for 4 years for use in the C202 from 1977 to 1981