The performance modifications added 30 horsepower and 30 Ft.-Lb. 4.7 liter V-8 HO (287 cu in., 265 bhp)Ī High Output version of the 4.7L was introduced starting with the 2002 model year. An incredibly detailed tech analysis, written by Richard Ehrenberg in 1999, can be found here: Chrysler’s New Cammer. The all-new 4.7-liter V-8 engine offers more power, less weight (438 lbs), increased fuel efficiency and lower emissions than the 5.2-liter engine it replaced. These refinements added more power (10 bhp), a 5db quieter operation with an enhanced lower “throaty” sound quality, and cleaner emissions.įor comprehensive 4.0 perfomance information and specifications, visit Dino’s JEEP 4.0 performance site.4.7 liter V-8 (287 cu in., 235 bhp) Upgrades included new cylinder heads with reduced-area exhaust ports, new exhaust manifolds, a new 50% more efficient slitter-vane water pump that added two horsepower, a new elastomer-coated steel intake manifold gasket, a two-piece high silicon-molybdenum alloy cast-iron exhaust manifold, automated belt tensioner and a new laminated oil pan. The standard in-line 6 cylinder engine was significantly reengineered in 1999. ![]() Jeep has used three different engines for the WJ series (plus a couple of 5-cylinder diesels for the export market): 4.0 liter I-6 (242 cu in., 195 bhp)
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