Engines
The 993 is powered by an air-cooled Porsche flat-six "boxer" engine. Porsche had begun employing the earliest evolution of this overhead cam engine in the 1963 Porsche 901, which had a displacement of 2 liters and produced 130 hp (DIN).
More specifically, the 993 engine is the final factory refinement of the Porsche-designated "M64" boxer engine. The standard, naturally aspirated M64/05(06) engine at 3.6 liters capacity is a refined version of the M64/01 installed in the 964 Carrera. At first, the M64/05(06) made 272 hp (DIN) through model year 1995, before Porsche switched to the VarioRam -equipped M64/21(22) engine, and power output increased to 285 PS (210 kW; 281 hp) . Slightly more powerful versions with 3.8 liter were available in the Carrera RS and as build-to-order options throughout the 993's lifespan.
The 3.6 liter twin turbo M64/60 engine uses two KKK K16 turbos and produces 408 PS (300 kW; 402 hp), although more powerful versions (430 and 450 hp (DIN)) were available as build-to-order options, in the Turbo S, and in the GT2. Depending on the country, Porsche still offers 430 and 450 PS (331 kW; 444 hp) kits for the Turbo.
Read more about this topic: Porsche 993
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