Exhaust Pipe

FOR IMMEDIATE RELEASE
(Free-Press-Release.com) November 11, 2008 -- A double U shaped exhaust pipe having varying internal pipe diameters for
increasing horsepower, designed within internal combustion engine vehicle
racing or other rules that limit such features as overall size. A first
stage portion of the exhaust pipe produces a first periodic flow of
exhaust, with a vacuum pulse created where the pipe internal diameter
increases upon the exhaust reaching a second stage portion. A third stage
portion of the exhaust pipe produces a third stage periodic flow of

exhaust upon the exhaust reaching an increased pipe internal diameter at a
fourth stage portion. These periodic pulsed flows are matched to the
opening of the intake and exhaust valves of the engine for a selected
engine speed range. The matching of a vacuum pulse to the opening exhaust
valve improves engine performance by drawing exhaust gases from the
engine. The matching of a vacuum pulse to the opening intake valve, which
overlaps with the exhaust valve being open, enhances engine performance by
swirling or otherwise mixing intake air and fuel received into the engine,

and by improving engine "breathing" by increasing the draw of intake air
and fuel into the engine. The exhaust pipe is particularly useful with
small, single-cylinder flathead engines for racing vehicles, as well as
other engines that do not naturally breathe well. One exhaust pipe
described includes features or use with a muffler attached at the end of
the exhaust pipe, and a second described exhaust pipe is intended for use
without a muffler.

Exhaust Pipe     Exhaust system