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Terry Vance (born November 26, 1953, in Bristol, Virginia) is an American former professional motorcycle drag racer, racing team owner and manufacturer of high performance parts for motorcycles. [1] He is a fourteen-time motorcycle drag racing national champion.
Andrew Hines (born May 25, 1983 in Villa Park, California) is a six-time National Hot Rod Association Pro Stock Motorcycle champion. [1] He was the flagship Screamin' Eagle/Vance & Hines Harley-Davidson V-rod. Andrew follows in the footsteps of his brother and crew chief, Matt Hines (NHRA Champion 1996, 97, 98).
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 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.
The VRSC was introduced in 2001 in a single model called the V-Rod aiming to compete against Japanese and American muscle bikes. The V-Rod's Revolution engine was developed for road use by Porsche Engineering with the aid of a few Harley-Davidson engineers [6] [7] [8] from Harley-Davidson's VR1000 V-twin racing bike engine.
The end of the final length of the exhaust pipe where it vents to open air, generally the only visible part of the exhaust system part on a vehicle, often ends with a straight or angled cut but may include a decorative tip. The tip is sometimes chromed. It frequently has a larger pipe than the rest of the exhaust system.
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