Abstract: An exhaust system is provided for internal combustion engines which relatively improves the performance and reduces noise output of such engines. The system comprises a plurality of exhaust pipes which are operably flow connected to exhaust ports of the engine at one end thereof and to discharge pipes through a collection chamber at an opposite end thereof. The discharge pipes include a silencing device in the discharge ends thereof. A feedback mechanism is provided to divert a slip portion of the sonic wavefront and/or mass exiting through an exhaust pipe back toward the exhaust port associated with an interconnected exhaust port or in such a manner as to delay passage of the slip portion out of the discharge pipes or to delay the slip portion and direct same to a different discharge pipe for discharge. The feedback mechanism may be valve and computer controlled so as to add or delete the feedback as required to maximize operation of the engine and/or assist in operation of a vehicle powered by the engine.

Abstract: An exhaust system is provided for internal combustion engines which relatively improves the performance of such engines. The system comprises a plurality of approximately equal length exhaust pipes which are operably flow connected to exhaust ports of the engine at one end thereof and to a collection chamber at an opposite end thereof. The system further includes discharge pipes which communicate between ambient atmosphere and the collection chamber. The exhaust pipes are grouped in sets such that each of the pipes in the set is generally axially aligned with one of the discharge pipes. The collection chamber has a cross-sectional area which is greater than the cross-sectional area of the exhaust pipes where they are attached thereto and converges to a smaller cross section at the opposite end thereof where the discharge pipes are attached thereto. The discharge pipes diverge away from the collection chamber and include a silencing device in the discharge ends thereof.

Abstract: A stroboscopic timing light is mounted on the ignition point carrying plate of an internal combustion engine and, when actuated, fires with a selected spark plug operating pulse, thereby illuminating marks located on an adjacent member rotating with the point breaker cam, permitting great convenience in checking and adjusting engine ignition timing.