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.
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): Jeep Grand Cherokee WJ - Engine specifications
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