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The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head, and merge into two pipes (secondary), which in turn finally link up to form one collector pipe. [2] Compared with a 4-1 exhaust system, a 4-2-1 often produces more power at mid-range engine speeds (RPM), while a 4-1 exhaust produces more power at high RPM.
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.
Winners circle for the NHRA Pro Mod Champions October 15, 2019, Team Sponsor: Bahrain 1 Racing Team: Killing Time Racing Driver: Steve Jackson AKA Stevie "Fast" Jackson Tuner: Billy Stocklin Pro Modified , also known as Pro Mod , is a class or division in the sport of drag racing used in the NHRA and FIA (quarter-mile) and the Professional Drag ...
The Barber Dodge Pro Series was a professional open-wheel auto racing series from 1986 to 2003. [ 1 ] [ 2 ] It was one of the first professional spec series for open-wheel racecars in North America. The races were primarily on road and street courses in North America, although the schedule did sometimes include a few ovals .
Allen Johnson's Mopar Dodge Avenger Pro Stock. Pro stock is a class of drag racing featuring "factory hot rods".The class is often described as "all motor", due to the cars not using any form of forced induction such as turbocharging or supercharging, or other enhancements, like nitrous oxide, along with regulations governing the modifications allowed to the engines and the types of bodies used.
The Volkswagen air-cooled engine is an air-cooled, gasoline-fuelled, boxer engine with four horizontally opposed cast-iron cylinders, cast aluminum alloy cylinder heads and pistons, magnesium-alloy crankcase, and forged steel crankshaft and connecting rods.
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