Here's something i wrote in the temporary TB:
Volvo Redblocks!
Volvo B18 and B20 Over Head Valve engines.
These are found in Volvo Amazon, Volvo PV, Volvo Duett, Volvo 1800 "The Saint", Volvo 140 and Volvo 240.
Stroke: 80 mm (3.150 inches)
B18 bore: 84 mm (3.307 inches)
B20 bore: 88.9 mm (3,500 inches)
Con-rod length (c to c) 145 mm (5.709 inches)
Firing order: 1-3-4-2
weight approx: 155 kg
piston height, total: 71 mm (2.795 inches)
piston height, pin center to top: 46 mm (1.811 inches)
piston to wall clearance: 0.01-0.03mm
Crankshaft main journal diameter: 63.45 mm (2.498 inches)
Con-rod's bearing's journal diameter: 54 mm (2.126 inches)
Wrist pin diameter (up to 1973): 22 mm (0.866 inches)
Wrist pin diameter (from 1973 onwards): 24 mm (0.945 inches)
Year model 1974 has an 8-bolt crankshaft. Older style crankshaft has only 6 bolts for the flywheel. These engines have a forged steel crankshaft. Also the con-rods on the 6-bolt engines are forged, not sure about the 8-bolt ones though. The cam shaft is inside the cylinder block and valves are being operated by pushrods. Both the cylinder block and the cylinder head are made of cast iron. Exhaust and intake channels are on the same side of the cylinder head.
B30
Used in Volvo 164
Pretty much the same engine as B20, but has two extra cylinders. Same year to year changes apply. The transmission connecting pattern is different to any other Volvo engine. Intake and exhaust channels are in different order than in the B20 engine. All other parts are same, or with only minor changes. The pushrods of the B30 are also shorter than those in the B20.
Volvo B19, B21, B23 engines
These are found in Volvo 240, Volvo 300 and Volvo 740 series cars.
Stroke: 80 mm (3.150 inches)
B19 bore: 88.9 mm (3,500 inches)
B21 bore: 92 mm (3.622 inches)
B23 bore: 96 mm (3.780 inches)
Con-rod length (c to c): 145 mm (5.709 inches)
Crankshaft main journal diameter: 63.45 mm (2.498 inches)
Con-rod's bearing's journal diameter: 54 mm (2.126 inches)
Wrist pin diameter: 24 mm (0.945 inches)
Piston height:
B19A: 46 mm
B19E: (->1983) 46 mm
B19E: (1984->) 46.7 mm
B19ET: 46 mm
B19K: 46.7 mm
B21A Europe: 46.7 mm
B21A: 46 mm
B21E: 46 mm
B21ET: 46.5 mm
B23A: 46.4 mm
B23E: 46.4 mm
Firing order: 1-3-4-2
Weight: 155 kg
Weight, E-engines 165 kg
In 1975 Volvo introduced a new engine, which clearly is somewhat based on the B18/B20 pushrod engine. These engines still have a cast iron cylinder block, but the cylinder head is cast aluminum. The cam-shaft is on top of the valves inside the cylinder head and it is being driven with a toothed rubber belt. The intake and exhaust channels open to different sides of the cylinder head, so the cylinder head is of cross-flow design.
All these engines have the same crankshaft and same con-rods. Engines from 1975-1980 have weaker con-rods than the newer engines, difference being in the material. Some B23E -engines and all B19ET engines had forged pistons as well. B19ET pistons were made by Kolbenschmidt.
Crankshaft is a forged steel unit, as are the post 1980 con-rods. These are known to be very strong engines.
These engines are tilted approx 15 degrees to left. B23 blocks can be identified by water plugs on both sides of the block. The B19 and B21 blocks have them on one side only.
Early B200 and B230, years 1985 to 1988
These are found in Volvo 240, Volvo 300 and Volvo 740 series cars.
Stroke: 80 mm
B200 bore: 88.9 mm
B230 Bore: 96 mm
Con-rod lenght (c to c): 152 mm
Crankshaft main journal diameter: 55 mm
Con-rod's bearing's journal diameter: 49 mm
Wrist pin diameter : 23 mm
Piston height: 39.7 to 41.9 mm
Firing order: 1-3-4-2
These are the so called weak redblocks. They have skinny con-rods, which are also known as 9mm rods. Not suitable for performance applications. The thrust bearing is also situated in the middle of the crankshaft. These too have a cast iron block and cast aluminum cylinder head. The cylinder heads are interchangeable with B19, B21 and B23 engines. Both turbo and NA version have the same crankshafts and connecting rods, only pistons are different.
There is also a boat engine version of this B230, known as Penta. That one has a forged crankshaft.
Late B200, B230 engines, K-block. Years 1989 to 1998.
These are found in Volvo 240, Volvo 300, Volvo 740 and Volvo 940 series cars.
Stroke: 80 mm
B200 bore: 88.9 mm
B230 Bore: 96 mm
Con-rod lenght (c to c): 152 mm
Crankshaft main journal diameter: 63 mm
Con-rod's bearing's journal diameter: 49 mm
Wrist pin diameter: 23 mm
Firing order: 1-3-4-2
This is a revised version of the "low-friction" engine first shown in 1985. The crankshafts thrust bearing is again found at the end of the crankshaft, as in B19, B21 and B23 engines. The con-rods are stronger than in earlier B200 and B230 engines. Those are also known as 13mm con-rods. Same cylinder heads as with earlier B200 and B230 engines. Cylinder heads are also interchangeable with B19, B21 and B23 engines. Both turbo and NA version have the same crankshafts and connecting rods, only pistons are different.
There is also a boat engine version of this B230 too, known as Penta. That one has a forged crankshaft also.
