7MGE Engine Specifications
by 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.
Measurements
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.
Power
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.
Miscellaneous
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.
7M-GTE
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.
References
Writer Bio
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.
