toyota g engine

The Toyota Motor Corporation G-family engine is a family of straight-6 piston engines produced from 1979 to 2008. It is notable in that only a single displacement, , was produced in this series. Initially belt-driven OHC non-interference engines (except the VVT-i version which is an interference engine), multivalve DOHC (except the 1G-EU SOHC 12 valve engine) and variable valve timing were added later during the production run. The 1G-GEU was Toyota's first mass produced four-valve twincam engine. A prototype version of the 1G-GEU called the LASREα–X, featuring twin-turbos, variable valve timing and intake as well as variable displacement, was fitted to the Toyota FX-1 show car at the 1983 Tokyo Motor Show. It showcased a number of technologies which were later to become commonplace.

These engines were used as a lower-displacement alternative to the more upmarket M family and JZ family straight-sixes.

For ten months (in 1967-1968), Toyota also offered Hino's GR100 engine as the "Toyota G" in the shortlived Briska light truck.

G (Hino GR100)

After Toyota's takeover of Hino Motors in 1967, the Briska one-tonne truck was sold with Toyota badging for ten months. The engine code was changed from Hino's "GR100" to "G" for these cars. The engine is a 1251 cc watercooled OHV inline-four with distant Renault origins and was originally developed by Hino for their Contessa passenger car. Bore and stroke are , maximum power at 5500 rpm. Hino's earlier models had a variety of power outputs ranging from 52 to 65 PS.

Apart from its name, this engine is unrelated to the later series of Toyota G engines.

1G

Since just one displacement was offered, all G-family engines are marked 1G and share the same "square" bore and stroke.

Applications:
* Toyota Soarer
* Toyota Celica Supra
* Toyota Crown
* Toyota Crown Comfort/ Crown Sedan
* Toyota Cressida/ Mark II/Cresta/ Chaser
* Toyota Altezza
* Lexus IS200

1G-E

The export-spec two-valve 1G-E had no emissions controls and were used in commercial vehicles and for a few export markets, mostly southeast Asia. Typical specifications:
* at 5000 rpm, torque at 4000 rpm (Mark II, 1986, Indonesia)
* at 5200 rpm, JDM Crown GS130/131/136V/130G

1G-EU

The Japan-spec 1G-EU was produced from 1979 through 1988. This and the 1G-E are the only two-valve SOHC members of the family. Output was at 5400 rpm and at 4400 rpm.

1G-FE

The DOHC 1G-FE uses a narrow valve angle and other fuel economy optimizations. It was introduced in 1988, it features a cast iron block with aluminum cylinder head. Output was at 5,600 rpm and at 4,400 rpm. In 1998 VVT-i was added, which bumped output to at 6,200 rpm and at 4,400 rpm for the Altezza/IS 200. Production of this engine family ceased in 2008 after the discontinuation of the Crown Sedan mild hybrid.

Applications:
* Toyota Altezza/Lexus IS 200
* Toyota Crown
* Aug 2001–Aug 2008 Toyota Crown Sedan GBS12, GXS12
* Toyota Chaser/ Mark II/Cresta
*Toyota Mark II Blit
* Toyota Verossa
* Toyota Supra
* Toyota Soarer

1G-GEU

The 24-valve DOHC 1G-GEU was intended for high performance and featured a pent-roof combustion chamber. Introduced in August 1982 and produced through 1986, mostly for the Japanese market, output was at 6,200 rpm and at 5,600 rpm. This was Toyota's first multi-valve twincam engine to make it to the market, and won the "JSME Medal for New Technology" (Japan Society of Mechanical Engineers) in 1982. To minimize the downsides of a multi-valve setup, the 1G-GEU was also equipped with T-VIS (Toyota Variable Induction System), increasing low to mid-engine speed torque. Like all following twin cam Toyotas, it used a timing belt rather than chain, for less noise and lower maintenance requirements. In August 1983, the fuel injection system was changed to EFI-D, which measures the pressure in the intake manifold to determine the proper air-fuel mixture.''All About the Toyota Twin Cam''
p. 20

Applications:
* Aug 1982–1985 Celica XX GA61
* Aug 1982–1992 Toyota Chaser/ Mark II/Cresta
* Aug 1983–1995 Toyota Crown
* Feb 1983–1991 Toyota Soarer

1G-GE

The 1G-GE replaced the 1G-GEU in 1988. It was detuned from to and served the same cars as 1G-GEU did. Torque was at 5600 rpm. It was produced for the Supra GA70 until 1993.

1G-GTE

The 24-valve DOHC 1G-GTE added two CT-12 turbochargers to the versatile motor. There were 3 generations of this engine both air-to-air and air-to-water intercoolers were used, pushing output from at 6200 rpm and at 3800 rpm using the air-to-air over the air-to-water. This was the most powerful engine of the whole G family. In May 1991 it was replaced with the 280 PS 1JZ-GTE on most Toyota cars.

Applications:
* 1986–1992 Supra MK3 (GA70; JDM only)
* 1986–1992 Mark II/ Chaser/Cresta (GX71, GX81)
* 1986–1991 Soarer (GZ20)

1G-GP/GPE

The 1G-GP and 1G-GPE was an LPG version of the 1G-GE engine. Output is at 5600 rpm and torque is at 2400 rpm.

Applications:
* Toyota Crown Sedan (GS130, GS151)
* Toyota Crown Comfort/Sedan (GXS10)

1G-GZE

The 1G-GZE was a supercharged version produced from 1986 till 1992. Output is at 6000 rpm and at 3600 rpm. Like the turbo, it was a 24-valve DOHC engine but featured a distributorless ignition system (DIS). The 1G-GZE was mated only with automatic gearboxes. In August 1991 it was replaced with the 1JZ-GE on the Mark II/Chaser/Cresta, while serving on the Crown until 1992.

Applications:
* Toyota Crown GS120, GS121, GS131, GS130G (Station Wagon)
* 1988–1990 Toyota Mark II/Chaser/Cresta GX81

References

See also

* List of Toyota engines

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Straight-six engines
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