BMW 735i Engine
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The BMW 735i was one of several models within the German automaker’s flagship 7 Series line. The 7 Series itself serves as the successor series to German automaker’s New Six line, offering owners a luxury experience as defined by the performance oriented automaker. The 735i model designation spans both the E23 and E32 generations, covering a period spanning from the 735i’s introduction under the E23 in 1977 to its end under the E32 in 1994.
The North American versions of the E23 735i utilized a 3.4-liter variant of the M30 SOHC inline six-cylinder, often nicknamed the “Big Six” due to their prestige and positioning within the BMW hierarchy. Fitted with a catalytic converter and 8.0:1 compression, the M30B34 generated 182 horsepower and 210 pound-feet of torque. At the time, the M30B34 was the largest and most powerful 7 Series offered in the U.S. Outside of the North American market, the 252-horsepower 745i Turbo and the 282-horsepower South Africa-only 745i occupied the top tier in terms of power output.
In the E32 735i, BMW employed a revamped variant of the M30 engine, this time featuring a higher compression ratio of 9.0:1. In this form, the M30B35 produced 208 horsepower and 225 pound-feet of torque. In the North American market, the E32 735i would be the last 7 Series vehicle sold with an inline six-cylinder engine, as it was subsequently replaced by the 4.0-liter and 4.4-liter eight-cylinder engines in the successor E38 7 Series.
BMW 735i engines have a reputation for being relatively long-lived if given the proper amount of maintenance and upkeep. These motors are usually available from most well-known engine brokers and dismantlers, although they are expected to be harder to find as time goes on. The youngest E32 7 Series is nearly 20 years old and as these vehicles age, used replacement engines will surely become harder for owners to find.