BMW/ALPINA C1 2.3/1

BMW/ALPINA C2 2.5

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Alpina C1

The Alpina C1 was based on the E21 323i and was among their most popular early models, providing superior performance over the unmodified car. The C1 2.3 made 125 kW (168 hp) and 225 N⋅m (166 lb⋅ft) of torque. 0–100 km/h (0-62 mph) is achieved in 7.8 seconds. Top speed was 213 km/h (132 mph).The extra power is due to special Mahle pistons, and a special exhaust and ignition system. It also received dry-sump lubrication and a short-ratio five-speed gearbox.Only 35 C1 cars were built, making it one of the rarest Alpina models. As BMW released the 325i, Alpina responded with the C2 2.5, and later the 2.7 models, providing between 190–210 hp (142–157 kW). The brakes and suspension were also upgraded.

The C1 2.5 and early C2 / 2.6* models used the M20B23 (2,3L) engine, but bore and stroke were increased to achieve a displacement of 2552 cm3. Alpina reworked the head which was ported and polished, installed harder valve springs and a hotter cam. The intake manifold was also reworked, and Alpina used a larger throttle body. It produced 136 kW (182 hp), with 246 N⋅m (181 lb⋅ft) of torque. Alpina claimed 0–100 km/h (62 mph) acceleration in 7.1 seconds. Top speed was 220 km/h (137 mph). Production is unclear, with estimates ranging from 35 cars built to around 400 depending on the source.

Alpina C2 2.7 Allrad, based on the all-wheel drive BMW 325ix

An interesting variant of the M20 engine was Alpina’s C2. The first C2 combined the wider bore of the M20B25 with the slightly larger 76.8 mm (3.02 in) crankshaft of an M20B23, to create a torquier engine of 2552 cc. This version put out 185 PS (136 kW; 182 hp) and 265 N⋅m (195 lb⋅ft), 74 units were built between 1985 and November 1986. After the C2 2.7 appeared in the spring of 1986, the 2.5 was slightly upgraded and gained 5 horsepower. However, to indicate its “little brother” position in the lineup, the name was changed to C1 2.5. When the September 1987 facelift model of the E30 was introduced, the 2.5 litre C1 was discontinued, although a few cars were finished into 1988.Alpina C2 2.7 Cabriolet

The larger yet 2.7 litre unit was introduced in February 1986 in uncatalyzed C2/1 form.This engine, sharing the dimensions of the M20B27, develops 210 PS (154 kW; 207 hp) at 5800 rpm and shows what the engine was really capable of. Originally installed in the E30-based Alpina C2 2.7, with available four-wheel drive, the catalyzed C2/2 appeared in the interim C2 2.7 Kat in March 1987. This was then renamed “B3 2.7” five months later, by which time the “C2” labelled cars were discontinued. The B3 2.7 continued to be available until June 1992, in all body variants and drivetrain configurations (excepting automatics) in which the E30 was offered.Around 1986, 67 “B6 2.7”-labelled C2-engined E30s were built for export to Japan, where the larger 3.0 L B6 3.5 had a hard time passing emissions regulations. Aside from the C2 drivetrain, the B6 2.7 is cosmetically identical to the B6 3.5.

Later C2 2.5 models (C2 /3 2.5) were based on the 325i. Alpina used the M20B25 engine with very few modifications compared to earlier models. Again the cylinder head was decked to increase compression ratio, and it was ported and polished. The ECU was also remapped. Max power is 140 kW (188 hp), with 235 N⋅m (173 lb⋅ft) of torque. 0–100 km/h (62 mph) was achieved in 7.2 seconds. Top speed is 220 km/h (137 mph). Only 50 cars were built.

The C2 /1 2.7 used the 325e eta model engine block, crank and rods, but with custom flat head pistons provided by Mahle. Originally Alpina modified the “200” casting number cylinder head specific to the 325e with bigger intake valves, larger air intake ports, and redesigned the valve chamber for better flow. A more aggressive camshaft was used, with higher lift and duration, and harder valve springs were installed. Compression ratio was increased to 10.2:1. The C2/1 2.7 made 210 bhp (157 kW) with 267 N⋅m (197 lb⋅ft) of torque and was the fastest E30 available at the time(227 km/h (141 mph) top speed). 108 cars were built.

Later C2 /2 2.7 (and early 1987 B3 2.7) used the M20B25 block with ETA (325e) crank and rods. The intake manifold was also redesigned for better flow. The head was decked to improve compression ratio (10.1:1 for models with the 731 head, 9.6:1 for later “885” head models with catalytic converter) and matched with custom pistons – flat Mahle pistons for engines equipped with the 731 head, and domed KS pistons for engines equipped with the 885 head. Larger throttle bodies were installed (the C2/2 version uses the same throttle body as the M20B25 325i). A total of 309 cars were built between 1986 and 1987. The C2/2 2.7 makes 204 bhp (152 kW) and 266 N⋅m (196 lb⋅ft) of torque. Top speed is 224 km/h (139 mph) and 0–100 km/h (62 mph) is achieved in 7.5 seconds.

BMW/ALPINA B3 2.7

BMW/ALPINA B3 2.7 katalysator

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The B3 2.7 is similar to late C2/2 2.7 cars. It uses the M20B25 block with M20B27 crank and custom rods. The 885 head is exclusively used for the B3 model. The head is decked ~ 1 mm to improve CR to 9.6:1 and matched with custom domed KS or Mahle pistons. Intake and cylinder head are ported and polished. Custom ECU mapping is used. Engine management is Bosch Motronic 1.3. The B3 2.7 is equipped with a catalytic converter to conform to emission standard of the time. Performance numbers are similar to the later C2/2 2.7 cars. 254 cars were built from 1987 to 1992.

BMW/ALPINA 3/1 (E30)

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