Shifterati

BMW M20 engine

This page is a draft. It has not been approved yet, so read it with care.

BMW's small belt-driven six from 1977 to 1993, in the E30 325i and the economy-tuned 325e.

The story

History: facts, each with its source

BMW built the M20 from 1977 to 1993. The 2.5L M20B25 went into the 325i from 1985. The 2.7L M20B27, called eta, was tuned for economy and low-speed torque, and first went into the US 528e in 1982 and then the 325e.1

  • Block and head: Cast-iron block, aluminium head1
  • Valvetrain: Single overhead cam driven by a belt, two valves per cylinder1

Sources

  1. Wikipedia (M20)