Lexus V8 Engines
There are four main types of Lexus V8 engines in the UZ family that are popular in the conversion market today. They consist of the 1UZ-FE Square Rail being the oldest, the 1UZ-FE Round Rail, The 1UZ-FE VVT-i and 3UZ-FE VVT-i. Below is a brief description of all four types of Lexus V8 engines to give you a clear understanding of the differences. The original 4.0 L (3968cc) Lexus V8 Engines were debuted in 1989. It consisted of an all alloy block and was released in the original Lexus LS 400 and Toyota Celsior.
The Lexus V8 engine was later released in various other models over the years but the basic design stayed the same. The Lexus V8 has always been considered to be a very strong, very smooth and extremely reliable. All the UZ family of V8 Lexus engines feature a 6 bolt main bearings cap design making it popular for forced induction as a result of its super strong sub assembly. One item of this motor that deserves special mention is that the pistons are hypereutectic.
1UZ-FE Lexus V8 1989~1993
These Lexus V8 Engines are an overs square design with a bore of 87.5 mm or 3.44 inches and a stroke of 82.5 mm or 3.25 inches. In its standard, original trim with 10.0:1 compression, power output is 191 kW (256 hp), torque of 353 N·m (260 lb·ft).
This V8 Lexus engine has a few recognisable parts to distinguish it form its newer design. It has a serviceable idle control unit with three screws holding it together. This means you can open it and clean the working parts of carbon build up. The engine was build using square fuel rails that were milled from a solid piece of aluminium. The engine comes with separate plastic parts closing and neatening the top appearance of the V8. The ignition coil on the left side of the engine is in a horizontal position and there is usually a plastic cover over the throttle cable attachment with traction control system written on it.
There are few advantages on these engines as they are pretty old by now but there is a feature that takes first place. This would be the connecting rods as they are a lot thicker than the newer models and makes good for turbo and supercharger conversions.
1UZ-FE Lexus V8 1993~1997
The Lexus V8 Engines were revised in 1995 with a increased compression ratio to 10.4:1 resulting in peak power of 195 kW (261 hp) and torque of 363 N·m (268 lb·ft). They were built with lighter connecting rods and pistons for weight loss as they were way over engineered on the first generation. The second generation V8 Lexus engines are easy to sight out of a batch of imported engines. They are physically identical but they were produced with round cast aluminium fuel rails apposed to square. They had no little plastic covers closing us the gaps on the top of the engine and they have a sealed idle control valve. The second generation Lexus V8 was built to fit a plastic cover that closed the complete top side of the engine but unfortunately they get broken when shipped into south Africa and would have to be ordered separately. Both of the Lexus V8 1UZFE engines were mated to a four speed automatic transmission.
1UZ-FE V8 VVT-I 1997~2000
The 1UZ-FE VVT-i Lexus V8 Engines were introduced in 1997. They introduced Toyota’s Variable Valve Technology, variable throttle length and the loss of distributers making it in a different league to its predecessor. The engine had a lot of changes making it a totally different looking engine. The only part which is pretty much the same is the aluminium engine block which looks identical to the untrained eye. It had an increase on the compression to 10.5:1 which resulted in an increase in power to 195 kW (261 hp) and torque of 363 N·m (268 lb·ft. The variable valve technology also resulted in a much differed power curve as opposed to it’s younger brother. This meant the ride was even smoother.It was mated to a 5 speed automatic transmission opposed to the 4 speed auto transmission of it’s younger sibling. The new Lexus V8 VVT was just an all round better machine as everything changed. It is better on fuel, has a smoother drive, has a better management system and much more power. This design followed through the 3UZ 4.3 VVT and went all the way through to 2010.
3UZ-FE V8 VVT-I 2000~2010
The 3UZ-FE Lexus V8 Engines are a 4.3 L V8. It consists also of a full alloy block and quad cams and 32 valves. It also had a 5 speed auto transmission fitted until 2003 where it then was graced with a 6 speed automatic box.
This motor has impressive power figures standing at 216 to 224 kW (290 to 300 hp) at 5600 rpm with 441 N·m (325 lb·ft) of torque at 3400 rpm.
It also carries with it the Variable Valve Technology that was in the later 1UZ-FE .
Please feel free to go to other page to get much more detailed and technical info on these and other motors.