BY ENGINE/4age
From AE86 Driving Club FAQ
4age Page
History
The ‘A’ family of engines is unlike the very first Toyota type A engine. Toyota first completed the type A engine in September of 1934. It was a 3.4 liter, 6 cylinder, reverse engineered Chevrolet power plant. Today’s ‘A’ family of engines was and still is a successful and versatile 4 cylinder over head camshaft mass production power plant. The ‘A’ family beginning was humble but was the foundation for Toyota to start its “New Generation” of compact, lightweight, powerful and efficient power plants during the early 80’s. The ‘A’ family was used as part of the bases to start Toyota’s “Second” Generation of sport type engines.
The first generation sport type engines were the 3M, 5M-GE, 6M-GE series; the 9R, 8R-G (10R), 18R-G, 18R-GE, and the 2T-G, 2T-GE and 3T-GE series.
Toyota’s first sport-type twin-cam engine was the 3M-type, which debuted with the Toyota 2000GT in 1967. Since then Toyota has taken high-performance DOHC (Double Over Head Cam) engines out of the realm of enthusiast-only sports driving, and put them within reach of more drivers with the 9R-type, the 10R-type, the 2T-G type, and the 18R-G type.
The oil crises of the 70’s and stringent emissions control regulations were a watershed event as far as twin-cam engines were concerned. However, Toyota called upon a considerable accumulation of technology and know-how as well as a concentrated R&D effort to continue the mass production of twin-cam engines.
In order to restore losses in engine output and response resulting from the emissions control measures instituted in Japan and the US around the mid 70’s and to exceed the earlier levels of engine capability and performance, Toyota introduced the “New Generation” series beginning with the 1G inline 6 series followed by the 4A-G series. The 4A-G is a direct decedent of the 1A engine, introduced in 1978 and progressed to the multi-valve engines of 1982.
In 1982, Toyota introduced the 1G-GE twin-cam engine, which was the start of the New generation (“second generation”) of Toyota 4 valve per cylinder sport type engines. This new engine had four valves per cylinder, technology which until then had been confined to the racing circuit. The technology achieved in the 1G-GE gave birth to a whole new generation of Toyota twin-cam engines. Furthermore, as twin-cam engines became run of the mill, Toyota countered with turbocharged models like the 3T-TGE in 1982, the twin-turbocharged 1G-GTE in 1985 and Japan’s most powerful engine of 1988 the 7M-GTE (mounted in the Supra Turbo A cars).
In 1985 Toyota introduced Japan’s first supercharged engine, the 1G-GZE and the year after, the 4A-GZE, mounting the SC12 supercharger.
The “second” generation of Toyota engines was developed in anticipation of the diversified and advanced needs of a new generation of automobile enthusiasts. These engines adopted advanced engine technologies developed for emissions controls, low fuel consumption, lightweight and compact design. Toyota’s goal was not only to enhance power but to have engines with quick response, low noise, and maintenance-free operation. Toyota further advanced the basic concept of comfort with what an engine should sound like.
Beginning in 1982 Toyota began mass producing 4-valve engines as part of its second-generation twin cam engine program. The 1G-GE and the 4A-GE were the start of the new configuration sport type engines. At that time they were said to be “high–output, quick-response yet fuel-efficient engines that bring the kind of appeal that’s not seen in conventional engines.” At the same time Toyota moved into the high-efficiency models as well.
The biggest differences between the (then) new high-efficiency twin cam 4-valve engines (designated as “F”), the conventional base engines and the “sports-type twin-cam” engines (designated as “G”) are the compact 4-valve head. This allows the engine’s to have superiority in overall efficiency, and in performance in everyday-use rpm ranges.
High-efficiency engines emphasize efficiency, throttle response, torque and practicality. Where, sports-type twin-cam engines are high performance machines that emphasize high-end power with high output and RPM and quick response. Thus Toyota has taken the sophisticated twin-cam 4-valve mechanism and put it to two different uses. This, Toyota reasoned, was better to serve a wider scope of user needs.
In 1989 Toyota was selected as the major sponsor for the Formula Atlantic race series along with Toyota Racing Development (TRD-USA) being selected as the official engine supplier. Thus the Cosworth engine was replaced. The Formula Atlantic cars are open wheeled, open cockpit race machines primarily for up and coming stars of the likes of father and son, Gilles and Jacques Villeneuve, Bertil Roos, Elliott Forbes-Robinson, Bobby Rahal, Keke Rosberg to name but just a few. Up until that time, the formula ran Cosworth Ford’s BDA (BDD) (Belt driven) engines that was apart of the “old” Formula B program and similarly configured for FIA’s Formula Mondiale. The engine selected was a modification of the venerable 4A-G, 1600cc, twin overhead cam, 4 valve per cylinder power plant. In 1994 improvements to the engine was approved, which included the use of electronic controlled fuel injection.
Contrary to a false assumption that the 4A-G is a copy of the Cosworth BDA, (coincidental ‘A’ series designation on both engines). There are little, if any, interchangeable parts between the two engines, outside of maybe some nuts and bolts. The Cosworth 4-valve design started life using the Ford Cortina engine block, with its distributor located on the side of the block and progressed to belt driven Escort engines. The basic block was, like the current formula Atlantic engine, based on a production block. Most of the Ford blocks that Cosworth used could be taken up to 2 liters. The 4A-G is limited to around 1.6 liters maximum, because of the deck height and bore spacing. The included valve angles for the BDA is 40°, along with what has become a Ken Duckworth design feature, and that is the use of a separate camshaft tray. To the contrary, the 4A-G has a one-piece head with the camshaft saddles cast right in. The included valve for the 4A-G is 50°, more similar to the earlier Alfas or other Italian designs of the 70’s.
The ‘A’ family of engines was designed as an over head cam power plant. The compact, thin cast iron block has served Toyota as a very versatile foundation for its engine evolution that is still in production.
Toyota’s sport-type twin-cam engines utilize a DOHC 4-valve per-cylinder configuration, but it is a very simple and reliable one. The camshafts act directly on the valves (through the shim and follower) using the same principle that was employed on Salmson racing engines of 1927. The increase intake and exhaust valve area of a four-valve design improves the volumetric efficiency, and the lighter weight of the valve train allows higher-revs. As Toyota’s sports-type engines should be, these engines are designed and built for high output and quick response.
Unlike Toyota’s high-efficiency “F” type engines, the sports “G” type have a wide valve included angle, which improves the intake and exhaust flow, especially during high-volume gas flow. Further, the pentroof combustion chambers and centered spark plugs assure superior combustion characteristics, which means that a high compression ratio can be used. As the engine is designed for high-rev, high-output operation, its components are generally stronger than those of the high-efficiency engines.
For its day, high power was not Toyota’s only major characteristic defining its sports-type twin-cam engines. Low friction loss and improved combustion combined to result in excellent fuel economy. Furthermore, the simplicity of the valve-train mechanism resulted in superior reliability as well as ease of maintenance. These engines were high-performance power plants that rate high in practicality and still do even after the turn of the century.
Another technical feature that came as a result of Toyota looking for performance improvements with out sacrificing low-end streetablity was the use of a variable induction system. The Toyota Variable Induction System (TVIS) boosts torque output across the rpm range and is calibrated to react to driving conditions. Its introduction coincided with the 4A-G.
In 1989 Toyota had three engine production plants, Shimoyama , Kamigo and Tahara. Since the high-efficiency twin cam engines, 4A-FE, 4A-F, 5A-F, 5A-FE and 1G-FE were produced in the Shimoyama plant, it is assumed that the sports-type 4A-Gs were built along side. Since that time, Toyota has many more engine production facilities around the world, with 7A engine blocks and cranks being manufactured in the UK (Toyota Motors Manufacturing, TMUK), and shipping them to Japan. TMUK is also shipping 4A engines to Turkey. While Australia, TMMCA (Toyota Motor Manufacturing Co. Australia) is producing 4A engines and shipping them to New Zealand. Moreover China, TTME, (Tianjin Toyota Motor Engine Co. Ltd) is producing 5A engines and is also shipping them to Japan.
4A-G Engine Codes
Every Toyota “engine type” has a code consisting of numbers and letters. An “engine type” may actually be a family of engines spanning several design generations and encompassing different specifications or components.
The first character is always a number followed by one or two letters. The number indicates the generation. The letter(s) indicates the engine family.
Following the engine generation and family codes, there are different combinations of additional letters, each of which represent a specific engine characteristic:
C - Equipped with emissions control systems (note: The “C” is not used if the engine was originally equipped for emissions controls.)(The C notation has been associated with California’s (USA), at that time having stricter emission standards)
U - Equipped with emissions control systems for Japan. (The U notation has been associated with the introduction of Unleaded fuel available in Japan at that time)
E - Electronic fuel injection (EFI)
F - Gear coupled cam drive; dual overhead cam (DOHC) engine: timing belt or chain drives one cam, and “scissors” gear drives the other cam. [Narrow included valve angle]. The split “scissors” gear is a unique way to eliminate gear backlash.
G - Dual overhead cam (DOHC) engine: timing belt or chain drives both cams. [Wide included valve angel]
L - Transversely mounted in vehicle
T - Turbocharged
Z - Supercharged
Examples:
4A - SOHC, 8 valves
4A-C - SOHC, 8-valves, equipped with emissions control system
4A-LC - SOHC, 8-valve, transversely mounted, equipped with emissions control system
4A-GE - DOHC, 16-valve, fuel injected
4A-GEC - DOHC, 16-valve, fuel injected, equipped with emissions control system
4A-GELC - DOHC, 16-valve, fuel injected, transversely mounted, equipped with emissions control system
4A-F - DOHC, 16-valve, gear coupled cam drive, carbureted
4A-FE - DOHC, 16-valve, gear coupled cam drive, fuel injected
4A-ELU - DOHC, 16-valve, gear coupled cam drive, fuel injected, transversely mounted, equipped with emissions control system for Japan.
4A-GZE - DOHC, 16-valve, supercharged and fuel injected
The “A” block series is a versatile engine that has undergone many revisions.
The 1A-C started out as a 4-cylinder, SOHC, 1.5 liter carbureted engine which was introduced in the 1980 Tercel. It was upgraded in 1981 to the 3A-C. Changes to the cylinder head improved emissions control and performance. The 4A, introduced in the 1983 Corolla line, featured an increased displacement to 1.6 liters. It was available in several variations including the 4A-C, (SOHC, carbureted), the 4A-GE (DOHC 16 valve head, fuel injected), and the 4A-GZE (DOHC 16-valve head, supercharged, fuel injected.) In 1984 the 4A-ELU was introduced with improved helical ports with swirl control valves, programmed sequential injection and improved ignition system which helped the system in the ultra-lean, high efficiency lineup. The ‘A’ family of engines have been used primarily in the Corolla, AE82, AE86, AE92, AE101 & AE111, but can be found in the first generation MR2, AW11 as well as some lesser known Toyota models (Engine options may vary depending on the vehicles point of sale.) The 4A-F and 4A-FE engines have replaced the 4A-C in Corollas since 1988. In 1990 the A block deck height was lengthen, the crankcase slightly enlarged and a special oil pan extension was add to increase the displace of the A family to its largest, 1.8 liters. Its designation was the 7A.
Toyota Part Number (Short Block)
Engine Type Year* Vehicle*
11400-14020
2A 8205-8408 AL20
11400-14030
2A-L 8305-8505 AE80
11400-15020
3A-U 8201-8303 AT140
11400-15030
3A 8208-8303 AL21, 25
11400-15040
3A-C 8511-8801 AL25
11400-15040
3A-U 8303-8712 AT140
11400-15050
3A 8303-8801 AL21, 25
11400-15060
3A-LU 8406-8807 AW10
11400-15061
3A-LU 8807-8912 AW10
11400-15070
5A-FE 8705-9107 AE91
11400-15080
5A-FE 8705-9107 AE91
11400-15080
5A-FHE 8905-9205 AE91
11400-16020
4A-C 8308-8707 AE82
11400-16020
4A-LC 8308-8707 AE82
11400-16020
4A-LC 8608- AT151
11400-16030
4A 8305-8707 AE71E
11400-16030
4A 8508-8711 AT151
11400-16030
4A, 4A-C 8305-8704 AE86
11400-16030
4A-L 8505-8807 AE82
11400-16030
4A-L, 4A-LC 8305-8505 AE82
11400-16030
4A-LC 8308-8808 AE82
11400-16040
4A-GEC 8408-8707 AE86
11400-16040
4A-GEU 8310-8508 AT141
11400-16050
4A-GE 8308-8507 AA63
11400-16050
4A-GEL 8410-8707 AE82
11400-16050
4A-GELC 8609-8709 AE82
11400-16060
4A-GE 8308-8704 AE86
11400-16060
4A-GE 8308-8507 AA63
11400-16060
4A-GEL 8410-8704 AE82
11400-16060
4A-GEL 8508-8708 AT160
11400-16070
4A-GELC 8406-8803 AW11
11400-16070
4A-GELU, 4A-FE 8802-8911 AE95
11400-16071
4A-FE 8911-9004 AE95
11400-16072
4A-FE 9004-9009 AE95
11400-16080
4A-GEL 8411-8803 AW11
11400-16090
4A-GEL 8411-8803 AW11
11400-16100
4A-L 8508-8708 AT160
11400-16100
4A-L 8508-8711 AT151
11400-16100
4A-L, 4A-LC 8505-8704 AE82
11400-16110
4A-GZE 8608-8912 AW11
11400-16120
4A-GE 8709-8808 AE82 FX
11400-16120
4A-GE 8708-8908 AE92
11400-16160
4A-F, 4A-FE 8708-9206 AE92
11400-16160
4A-FE 8909-9108 AT180
11400-16170
4A-F, 4A-FE 8710-8911 AE95
11400-16171
4A-FE 8911-9004 AE95
11400-16172
4A-FE 9004-9104 AE95, & Wagon
11400-16173
4A-FE 9104-9202 AE95
11400-16190
4A-GZE 8705-8905 AE92
11400-16200
4A-GELC 8803-8912 AW11
11400-16210
4A-GEL 8803-8912 AW11
11400-16220
4A-GEL 8803-8912 AW11
11400-16230
4A-FE 9108-9309 AT180
11400-16242
4A-FHE 9009-9104 AE95
11400-16243
4A-FE 9202-9308 AE95
11400-16243
4A-FHE 9104-9508 AE95
11400-16250
4A-GE 8909-9101 AE92
11400-16251
4A-GE 9101-9205 AE92
11400-16280
4A-GE 8908-8909 AE92
11400-16290
4A-GZE 8905- AE92
11400-16291
4A-GZE 9106-9505 AE101
11400-16300
5A-FE 9106-9505 AE100
11400-16300
5A-FE 9208-9608 AT192
11400-16310
4A-FE 9206-9704 AE101
11400-16310
4A-FE 9202-9601 AT190
11400-16340
4A-GE 9106-9505 AE101
11400-16360
7A-FE 9206-9408 AE102
11400-16360
7A-FE 9309-9508 AT200
11400-16390
7A-FE 9408-9704 AE102
11400-16390
7A-FE 9508-9712 AT200
11400-16390
7A-FE 9408-9608 AT191
11400-16400
4A-GE 9505- AE101
11400-16410
5-FE 9505- AE100
11400-16420
4A-FE 9508-9708 AE101
11400-16420
4A-FE 9508-9608 AT190
- Engine options and dates available may have varied from country to country
