7MGE Engine Specificationsby Sara Harvey
The 7M-GE engine was the last of the M Series, produced for top-of-the-line Toyotas from the 1960s to the 1990s. The 7M-GE launched in 1986 in the MA-70 Supra and was the only M Series with a four-valve cylinder head. The M Series engine was built into most of the Toyota six-cylinder vehicles produced during its 27-year run. The engine pioneered the Toyota twin overhead cam, electronic fuel injection, multi-valve technology and the turbocharger.
The 7M-GE is a three-liter, 2954 cc, 24-valve engine. The valves are placed at a 50-degree angle for performance, and the cylinder bore is 83 mm (3.27 inches). The stroke is 91 mm (3.58 inches). The 7M-GE is also double overhaul camshaft (DOHC), fuel-injected. The 7M-GE is one of the fabled Japanese power engines of its time, achieving both quiet and smoothness.
The 7M-GE outputs 190 to 204 horsepower (142 to 152 kW) at 6,000 rpm, and 185 to 196 feet per pound foot at 4,800 rpm. The 7M-GE was manufactured between 1986 and 1992 with 2954 cc and a compression ratio of 9.2:1, outputting 200 horsepower at 6,000 rpm. It was built between 1990 and 1991 with 2954 cc, and a compression ratio of 9.8:1 with 190 horsepower at 5,600 rpm. The 7M-GEU was built between 1986 and 1992 had 2,954 cc at 9:2:1 with 190 horsepower at 6,000 rpm. The 7M-GTE was manufactured between 1987 and 1990 and featured 2,954 cc with a 8.4:1 compression ratio for 230 horsepower at 5,600 rpm.
Raise normally aspirated 7M-GE engines to a 12.5 compression, maximum, or the design could interfere with the combustion airflow. The turbo compression can be set as low as 8.0:1. The 7M-GE can handle high rpms, but a continuous boosting past 16 pounds per square inch (psi) could warp the heads, for which the 7M-GE is notorious.
The MA-71 Toyota Supra was released in 1987 with the 7M, but was running an air-to-air inter-cooled CT26 turbo. The sports car setup was classified as the 7M-GTE, with 234 horsepower that could be tweaked to 300.
Based in New York City, Sara Harvey has written about the environment, city planning, health and lifestyles since 1994. A former newspaper reporter, she now writes freelance full time. Her work has appeared in "Boho," a New York-based green fashion magazine, and several humor, parenting and business publications. Harvey has a bachelor's degree in print journalism.