Motorized Bicycle Exhaust System
OwnerReginald Maceo Higgs, JR.inventor
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Abstract
Disclosed are exhaust systems for two-stroke engines mounted on bicycles. The exhaust systems include an expansion chamber having a divergent portion and convergent portion. The expansion chambers have different dimensions for the divergent portion and the convergent portion. The exhaust systems improve the power performance of the two-stroke engines operating at below maximal RPM by between about 15% and about 85% when compared to that of the two-stroke engines equipped with a stock exhaust pipe.
Claims30
An exhaust system for a two stroke engine of 66 cc/80 cc or a 70 cc hybrid engine comprising a first end and a second end, and comprising, in sequential order:
- a flange at the first end of the exhaust system;
- a header adjacent to the flange;
- a curved portion adjacent to the header;
- an expansion chamber comprising a front end and a back end, wherein the expansion chamber is adjacent to the curved portion at the front end;
- and
- a stinger extending from the back end of the expansion chamber;
- wherein the expansion chamber comprises a hollow chamber comprising a divergent portion at the front end, a belly about the center of the expansion chamber, and a convergent portion at the back end, and wherein the convergent portion has a truncated cone shape and an angle (θ) at the vertex (V) of between about 15° and about 30° and a height greater than the height of the divergent portion.
A method comprising attaching to an exhaust port of a two-stroke engine of 66 cc/80 cc or a 70 cc hybrid engine an exhaust system comprising a first end and a second end, and comprising, in sequential order:
- a flange at the first end of the exhaust system;
- a header adjacent to the flange;
- a curved portion adjacent to the header;
- an expansion chamber comprising a front end and a back end, wherein the expansion chamber is adjacent to the curved portion at the front end;
- and
- a stinger extending from the back end of the expansion chamber;
- wherein the expansion chamber comprises a hollow chamber comprising a divergent portion at the front end, a belly about the center of the expansion chamber, and a convergent portion at the back end, and wherein the convergent portion has a truncated cone shape and an angle (θ) at the vertex (V) of between about 15° and about 30° and a height greater than the height of the divergent portion.
(canceled)
Dependencies are inferred from the claim text.