MR2 Technical Knowledgebase - Toyota Engine Naming Explained

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Created	2007-08-16	Views	1144
Modified	2007-08-16	Id	4
Author	Tech KB

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Most of us are familiar with the seven engine codes associated with the Toyota MR2.

3A-LU
4A-GE
4A-GZE
3S-GE
5S-FE
3S-GTE
1ZZ-FE

Have you ever wondered what these mean?

The first part of the code describes everything below the head gasket. The letter(s) designates the engine family (basic block design), and the number indicated the version (changing bore and stroke).

For example: 3S- = 3rd version of S block.

The second part of the code describes all the good stuff above the head gasket.

G = Performance Head, twin cam, at least a 45° angle between intake and exhaust valves
F = Economy Head, narrower angle between valves T = Turbocharged
Z = Supercharged
E = Fuel Injected
L = Transversely Mounted
U = Japan Emissions
C = California Emmissions

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