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The Toyota JZ engine family is a series of inline-6 automobile engines. A replacement for the M-series inline-6 engines, the JZ engines were 24-valve DOHC engines. The JZ engine was offered in 2.5 and 3.0 litre versions. 1JZ The 2.5 L (2491 cc) 1JZ version was produced from 1990 to 2007 (last sold in the Mark II BLIT Wagon). Cylinder bore was 86 mm (3.39 in) and stroke was 71.5 mm (2.81 in).[1] It was a 24-valve DOHC engine with two belt-driven camshafts. 1JZ-GE Output for the non-turbo 1JZ-GE was 200 hp JIS (147 kW) at 6000 rpm and 185 ft.lbf (250 Nm) at 4000 rpm. Like all JZ-series engines, the early 1JZ-GE is designed for longitudinal mounting and rear-wheel-drive. All of these models also came with a 4-speed automatic transmission as standard; no manual gearbox option was offered.[1] 1JZ-GTE First Generation 1JZ-GTE in a 1991 Toyota Chaser Third Generation 1JZ-GTE VVTi in a 1989 Toyota CressidaThe 1JZ-GTE employs twin CT12A turbochargers arranged in parallel and blowing through a side-mount or front mount air-to-air intercooler . With an 8.5:1 static compression ratio, the factory quoted power and torque outputs are 280 metric horsepower (210 kW) at 6200 rpm and 363 newton metres (268 ft·lbf) at 4800 rpm respectively. These motors are over square (86.0mm bore x 71.5mm stroke). Yamaha may have had a hand in the development or production of these motors (possibly the head design), hence the Yamaha badging on certain parts of the motor, such as the cam gear cover. In 1991, the 1JZ-GTE was slotted into the all-new Soarer GT. The early generation 1JZ-GTEs combined the inherent smoothness of an inline 6 cylinder engine with the revving capacity of its short stroke and early power delivery of its small, ceramic wheeled turbochargers. The ceramic turbine wheels are prone to delamination in the setting of high impeller rpm and local temperature conditions, usually a result of higher boost. The first generation 1JZ's were even more prone to turbo failure due to there being a faulty one-way valve on the head, specifically on the intake cam cover causing blow-by to go into the intake manifold. Also on the exhaust side a decent amount of oil vapor flows into the turbos causing premature wear on the seals. The later 2nd Gens had this problem fixed and in Japan there was actually a recall in order to repair the 1st Gens, though that does not apply to 1JZ's imported to other countries. The fix is simple, and involves replacement of the PCV valve (2JZ); all parts are available through Toyota. The "third Generation" of 1JZs were introduced around 1996, still as a 2.5 turbo, but with Toyota's BEAMS architecture.[2] This included a reworked head, newly developed continuously variable valve timing mechanism (VVT-i) , modified water jackets for improved cylinder cooling and newly developed shims with a titanium nitride coating for reduced cam friction [3] . The turbo setup changed from parallel twin turbo (CT12x2) to a single turbo (CT 15B). The adoption of VVT-i and the improved cylinder cooling allowed the compression ratio to be increased from 8.5:1 to 9.0:1, making the 1JZ-GTE an interference engine[citation needed]. Even though the official power figures remained at 280 metric horsepower (210 kW) at 6200 rpm, torque was increased by 20Nm to 379 newton metres (280 ft·lbf) at 2400rpm. These improvements resulted in increased engine efficiency that reduced fuel consumption by 10%. The adoption of a much higher efficiency single turbocharger than the twins as well as different manifold and exhaust ports were responsible for most of the 50% torque increase at low engine speeds . This engine was used primarily in Toyota's X chassis cars (Chaser, Mark II, Cresta, Verossa), the Crown Athlete V (JZS170) and in the later JZZ30 Soarer, as the JZA70 Supra was long discontinued by this time. Applications: Toyota Chaser/Cresta/Mark II Tourer V (JZX81, JZX90, JZX100, JZX110) Toyota Soarer (JZZ30) Toyota Supra MK III (chassis code JZA70, Japan only) Toyota Verossa Toyota Crown (JZS170) 2JZ The 3.0 L (2997 cc) 2JZ has been produced since 1991 (first released in the 1991 Toyota Aristo). Cylinder bore was 86 mm (3.39 in) and stroke was 86 mm (3.39 in). VVT-i variable valve timing was added later in 1997 for the 1998 model year. 2JZ-GE The 2JZ-GE is a common version. Output is 220 hp JIS (158 to 169 kW) at 5800 to 6000 rpm and 209 to 220 ft.lbf (283 to 298 Nm) of torque at 3800 to 4800 rpm. It uses Sequential Electronic Fuel Injection, has an aluminum head and 4 valves per cylinder with some versions using VVT-i, along with a cast iron cylinder block. Applications: Toyota Altezza / Lexus IS 300 Toyota Aristo / Lexus GS 300 Toyota Crown/Toyota Crown Majesta Toyota Mark II Toyota Chaser Toyota Cresta Toyota Progres Toyota Soarer / Lexus SC 300 Toyota Supra MK IV [edit] 2JZ-GTE Engine bay of Supra JZA80The 2JZ-GTE is an inline-layout, six-cylinder, belt-driven