Saab H engine
B204 & B234

Engine
Power
Torque
Compression ratio
Bore x Stroke
Rod Length
Boost pressure
B204i:
130 hp (97 kW) @ 5500 rpm
177 N⋅m (131 lb⋅ft) @ 4300 rpm
10.1:1
90 mm × 78 mm (3.54 in × 3.07 in)
153 mm (6.0 in)
NA
B204E:
154 hp (115 kW) @ 5500 rpm
219 N⋅m (162 lb⋅ft) @ 3600 rpm
9.2:1
90 mm × 78 mm (3.54 in × 3.07 in)
153 mm (6.0 in)
0.4 bar (5.8 psi)
B204L:
185 hp (138 kW) @ 5500 rpm
263 N⋅m (194 lb⋅ft) @ 2100 rpm
9.2:1
90 mm × 78 mm (3.54 in × 3.07 in)
153 mm (6.0 in)
0.73 bar (10.6 psi)
B204R:
205 hp (153 kW) @ 5500 rpm
280 N⋅m (207 lb⋅ft) @ 2200 rpm
9.2:1
90 mm × 78 mm (3.54 in × 3.07 in)
153 mm (6.0 in)
1 bar (15 psi)
B234i 1990-1993:
150 hp (112 kW) @ 5500 rpm
212 N⋅m (156 lb⋅ft) @ 3800 rpm
10.1:1
90 mm × 90 mm (3.54 in × 3.54 in)
147 mm (5.8 in)
NA
B234i 1994-:
150 hp (112 kW) @ 5600 rpm
210 N⋅m (155 lb⋅ft) @ 4300 rpm
10.5:1
90 mm × 90 mm (3.54 in × 3.54 in)
153 mm (6.0 in)
NA
B234E:
170 hp (127 kW) @ 5700 rpm
260 N⋅m (192 lb⋅ft) @ 2100 rpm
9.25:1
90 mm × 90 mm (3.54 in × 3.54 in)
147 mm (5.8 in)
0.55 bar (8.0 psi)
B234L: 1990-1993
200 hp (149 kW) @ 5500 rpm
329 N⋅m (243 lb⋅ft) @ 1900 rpm 5MT
8.5:1
90 mm × 90 mm (3.54 in × 3.54 in)
147 mm (5.8 in)
0.81 bar (11.7 psi)
B234L 1994-1998:
200 hp (149 kW) @ 5500 rpm
323 N⋅m (238 lb⋅ft) @ 1800 rpm 5MT
9.25:1
90 mm × 90 mm (3.54 in × 3.54 in)
147 mm (5.8 in)
0.81 bar (11.7 psi)
B234R:
225 hp (168 kW) @ 5500 rpm
342 N⋅m (252 lb⋅ft) @ 1950 rpm
9.25:1
90 mm × 90 mm (3.54 in × 3.54 in)
147 mm (5.8 in)
1.08 bar (15.7 psi)

Question: How many generations of the B234 engine are there, and what years were each generation made?
Answer: There are two generations of B234 engine, one made from 1990-1993, the other from 1994 to 1998.