The BMW M20 is a SOHC straight-six petrol engine which was produced from 1977 to 1993. It was introduced eight years after the larger BMW M30 straight-six engine, which remained in production alongside the M20.

The BMW E28 is the second generation of BMW 5 Series executive cars, [1] which was produced from 1981 to 1988 and replaced the E12 5 Series. Pre-series production began in April 1981 and the car was introduced in the autumn that year.

Nov 2, 2021 · The BMW M20 is an inline-six, single overhead camshaft engine that was produced from 1977 to 1993. The M20 powered multiple BMWs, but it went down in history as the unit that powered the iconic E30 3-series. The German manufacturer intended for the M20 to replace its larger displacement inline-four engines, as it believed that it had greater ...

Mar 19, 2022 · Most M20 variants were used in either the 3-Series or 5-Series chassis. In the M20’s infancy, it was used in the later antiquated E21 and E12 chassis. These models were then replaced by the incoming E30 and E28 chassis.

Jan 1, 2025 · M20 - e2i Conversion The M20 "e2i" conversion is a popular modification for BMW enthusiasts seeking to enhance the performance of the M20B27 engine found in "eta" models by integrating components from the higher-revving M20B25 "i" engine.

Mar 26, 2025 · Explore common problems with the BMW M20 engine, their symptoms, causes, and effective solutions for maintenance.

Feb 3, 2025 · Explore common BMW M20 engine problems, their symptoms, and consequences to keep your vehicle running smoothly and reliably.

Mar 22, 2022 · This article discussed the best BMW M20 performance upgrades for your E21, E30, E28, or E34. M20 exhaust upgrades, cam upgrades and more.

Feb 12, 2006 · I was involved in several threads on e30tech regarding the stroked M20 engine. The 84 mm crank/ eta rod/"i" piston are a good set up although the rod ratio is extremely short. I would consider larger diameter, custom, light, forged pistons.

Oct 9, 2021 · The M20 was an I6 piston engine of BMW. The 12-valve, belt driven SOHC design was introduced in the 1976 BMW 520/6 and 320/6. With displacements ranging from 2.0 to 2.7 liters, it was the "little brother" to the larger BMW M30 engine. Powering the E21 and E30 3-Series, as well as E12, E28 and E34 5-Series cars, it was produced in 4 decades ...