Toyota Previa Engine
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Toyota rolled out the Toyota Previa back in 1990-1997 as an aggressive jump into the mini-van market. The engine used in the Previa was a 2.4 liter 2TZ that was based on the 22RE but laid almost flat when mounted. The mini-van market was being dominated by the Dodge Caravan, Chrysler Town and Country and the Volkswagon Transporter. Ford was in the mix with the Ford Aerostar, however the Aerostar was a RWD while the most popular mini-vans were FWD.
The design of the Toyota Previa was cutting edge for the mini-van market. The vehicle was a ground up build using its own platform. The engine is a mid-engine mount but the engine accessories like the alternator, power steering pump and air compressor were mounted in the front of the vehicle. This allowed Toyota to balance weight better and have a smaller foot print for the engine area. The downside was accessing parts of the engine and lack of the space needed for a larger engine if needed. The accessories mounted to a large bracket in the front area of the vehicle and were powered by the Supplemental Accessory Drive System or SADS as Toyota called it. The engine has a front driveshaft that went to the front of the vehicles and used a belt to drive the bolt on accessories there.
In 1994 the supercharged 2TZ-FE 2.4 liter engine was introduced. It offered more performance and helped with fuel economy. The supercharged version was intended as an option but soon caused the normally aspirated engine to stop being produced and all Toyota Previa mini-vans were supercharged. The 2TZ was only produced and used in the Previa. Most manufactures use an existing platform and drivetrain to keep down development and production costs. Toyota felt the need to break the mold and come out with a completely different mini-van. The last year of the Previa offered an automatic AWD transmission.