BMW E30 M3
Based on the 1986 model year E30, 3-Series, the first M3 was introduced with a 2.3L I4 S14B23 engine also known as the S14 motor. The engine design was based on various BMW parts: basic block layout from the M10 4 cylinder (found in the 2002 and 320 series) over bored and reinforced to similar specifications of the BMW M88 in-line 6 cylinder engine.
The cylinder heads valve train and al-round design from the BMW M1 and, M6 in-line 6 cylinder engines was adopted for superior fueling and better breathing.
BMW’s E30 M3 was campaigned by BMW Motorsport as well as other racing teams such as AC Schnitzer, competing in many forms of racing including rally and rallycross as well as German, British touring car racing included in other European countries and America.
In its final years of competition, the 2.5 liter S14 engine in full race trim was capable of over 250 hp (190 kW) and remained a naturally aspirated engine throughout.
The third car road-going version produced 192 bhp (143 kW; 195 PS) (catalyzed model) and 197.3 bhp (147 kW; 200 PS) (non-catalyzed model).
M3 Evolution models continued with 2.3 litre engines but characterized a number of modifications including a revised intake camshaft profile and modified exhaust camshaft timing, increased compression, and a more efficient cylinder head intake and exhaust port design layout. Larger diameter exhaust header tubes were designed and the exhaust system was absent of the catalyctic converter which put together, all contributed to produce approximately 220 Hp and 160 kW and later the Sport EVO 3 model production run, increased the engine displacement to 2.5 litres to produce an incredible 238 hp or 177 kW. These EVO Motor Sport engines were fitted with higher lift intake and exhaust camshafts for better breathing.
To keep the car competitive in racing following year-to-year homologation rules were changed and homologation specials were produced respectively for the sake of true racing competitiveness. These included the EVO 1, EVO 2, and Sports Evolution 3, some of which featured less weight and improved aerodynamics and more power.
By the end of their manufacturing year in 1996 the cars that were based on the standard M3, were equipped with 6 speed gearboxes and produced 294 bhp.
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