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Produced in 1991 by GMC along with Production Automotive Services (PAS)—the same company credited with building the 1989 Pontiac Turbo Trans Am—the GMC Syclone was the fastest production truck for 1991. Following the Syclone's production, the similarly powered 1992–1993 GMC Typhoon SUV was based on the GMC Jimmy platform. Also following ...
Originally, this system was used to inject air into the engine's exhaust ports to provide oxygen so unburned and partially burned hydrocarbons in the exhaust would finish burning. Air injection is now used to support the catalytic converter 's oxidation reaction, and to reduce emissions when an engine is started from cold.
The GMC rating is based on how many two-stroke cylinders - and the size of those cylinders - that it is designed to scavenge, with GMC's model range including 2–71, 3–71, 4–71 and 6–71 blowers. The 6–71 blower, for example, is designed to scavenge six cylinders of 71 cu in (1.2 L) each, resulting in an engine with a total displacement ...
When the descending piston first exposes the exhaust port on the cylinder wall, the exhaust flows out powerfully due to its pressure (without assistance from the expansion chamber) so the diameter/area over the length of the first portion of the pipe is constant or near constant with a divergence of 0 to 2 degrees which preserves wave energy.
The system adjusts both intake and exhaust timing between two settings. This engine produces 403 hp (301 kW) and 417 lb⋅ft (565 N⋅m) in the GMC Yukon Denali/XL Denali, GMC Sierra Denali, Hummer H2, and briefly in the Chevrolet Tahoe LTZ (MY 2008.5 – MY 2009) and rated at 403 hp (301 kW) and 415 lb⋅ft (563 N⋅m).
The GMC Typhoon is a high-performance SUV, ... fuel system and exhaust manifolds, producing 280 hp (209 kW) and 360 lb⋅ft (475 N⋅m) of torque.