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Similar to U engines, H engines consist of two separate flat engines joined by gears or chains. H engines have been produced with between 4 and 24 cylinders. An opposed-piston engine is similar to a flat engine in that pairs of pistons are co-axial but rather than sharing a crankshaft, instead share a single combustion chamber per pair of ...
The engine block is the same as the naturally aspirated 1NZ-FE engine, found in many Toyota models. It retains the same 10.5:1 compression ratio as the naturally aspirated sibling. Output is 143–152 PS (105–112 kW; 141–150 hp) at 6000 rpm with 196–206 N⋅m (145–152 lb⋅ft; 20–21 kg⋅m) of torque at 4000–4800 rpm.
A flat engine is a piston engine where the cylinders are located on either side of a central crankshaft. Flat engines are also known as horizontally opposed engines, however this is distinct from the less common opposed-piston engine design, whereby each cylinder has two pistons sharing a central combustion chamber.
In 2011, the Altis was facelifted and the older ZZ engine was replaced by an updated 1.8 ZR engine producing 140 bhp and was mated to a 6-speed manual like the diesel while a CVT gearbox replaced the outdated 4-speed automatic. The diesel was left untouched mechanically and had a different grill to differentiate it from the petrol.
Output for this engine is rated at 132 hp (98 kW) at 6400 rpm and 118 lb⋅ft (160 N⋅m) of torque at 4400 rpm for most applications. Compression ratio has been increased to 10.7:1, red line is at 6600 rpm. VVT-i varies the intake valve lift between 1 and 11 mm (0.039 and 0.433 in) according to load and RPM. [1] [2] Specifications
Over time, this led to oil blow-by, where excessive oil would enter the combustion chamber, causing the engine to start burning oil. Owners often reported needing to add oil between changes, with some engines consuming up to a quart every 1,000 miles. This leads to shortened oil changes, significantly increasing running costs and hassle.
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The 4.0 L (3,969 cc; 242.2 cu in) all-alloy 1UZ-FE debuted in 1989 in the first generation Lexus LS 400/Toyota Celsior and the engine was progressively released across a number of other models in the Toyota/Lexus range. The engine is oversquare by design, with a bore and stroke size of 87.5 mm × 82.5 mm (3.44 in × 3.25 in). [2]