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The "LS" nomenclature originally came from the Regular Production Option (RPO) code LS1, assigned to the first engine in the Gen III engine series. The LS nickname has since been used to refer generally to all Gen III and IV engines, [14] but that practice can be misleading, since not all engine RPO codes in those generations begin with LS. [15]
The first version of this engine family was a normally aspirated 2.2 L (134 cu in) unit. Developed under the leadership of Chief Engineer – Engine Design and Development Willem Weertman and head of performance tuning Charles "Pete" Hagenbuch, who had worked on most of Chrysler's V-8 engines and the Chrysler Slant-6 engine, [1] it was introduced in the 1981 Dodge Aries, Dodge Omni, Plymouth ...
In 1998, a marine derivative of the UZ powerplant was produced for boating applications. The 4.0 L VT300i engine, producing 224 kW; 304 PS (300 hp) at 6000 rpm and 420 N⋅m (310 lb⋅ft) at 4200 rpm, used the same block as the UZ engine on the Lexus SC 400, GS 400, and LS 400. Applications (calendar years): 1998 Toyota Epic S21 [11]
In 1988, the 4.0 received higher flowing fuel injectors, raising output to 177 hp (132 kW; 179 PS) and 224 lb⋅ft (304 N⋅m) — more power than some configurations of the Ford 302, Chevrolet 305, and Chrysler 318 V8 engines, and more than any of the Japanese 6-cylinder truck engines, but with comparable or superior fuel economy.
For 1994, horsepower was reduced to 175 hp (130 kW), mostly because of the installation of smaller-volume exhaust manifolds; torque ratings remained the same. [8] For 1997, the 3.9 L engine's torque output was increased to 225 lb⋅ft (305 N⋅m), with a compression ratio of 9.1:1. [8] Firing order was 1-6-5-4-3-2. [8]
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Since the stroke is significantly longer than the bore, the SOHC 16V (2-valve per cylinder) version of this engine is able to generate a peak torque of 350 lb·ft as low as 2501 rpm. The Willys Jeep L134 and F134 engines were undersquare, with a bore and stroke of 79.4 mm × 111.1 mm (3.13 in × 4.37 in) stroke (bore/stroke ratio = 0.714:1).
The VVT is a RFF engine derived from the Mazda MZI and does not have the mechanical buckets as on the Lincoln LS version. [citation needed] The engine has an output of 221 bhp (165 kW; 224 PS) at 6250 rpm, and 205 lb⋅ft (278 N⋅m) of torque at 4800 rpm. In second generation of the engine, it is updated to run on E85.