Abstract: An internal combustion engine having a crankcase, a cylinder connected to the crankcase, a compressed air assisted fuel injection system connected between the crankcase and the cylinder, and a reciprocating piston head located in the cylinder. The improvement comprises a fuel delivery system having two carburetor sections with two interconnected rotatable shafts.

Abstract: An internal combustion engine having a combustion chamber and a fuel delivery system for delivering fuel into the combustion chamber. The fuel delivery system includes a fuel entry proximate the combustion chamber, a combustion compression wave reflection conduit connected to the combustion chamber proximate the fuel entry, and a movable member located proximate the reflection conduit for at least partially opening and closing a path through the reflection conduit.

Abstract: A tunable toolholder with a dynamic vibration absorber is disclosed wherein an absorber mass is compressed between two elastomer supports utilizing at least one longitudinally movable pressure plate to dynamically tune the toolholder.

Abstract: A method of controlling fuel injection flow in a cylinder of an internal combustion engine. A piston head of the engine is provided with a combined flow redirector and holding bowl recess extending into a top side of the piston head. A fuel injection port is provided in the cylinder in a bottom portion of a combustion chamber of the cylinder located above the top side of the piston head when the piston is at a bottom dead center position. Fuel is injected from the injection port into the recess. The step of injecting comprises injecting the fuel at a first velocity when the engine is operating at a first speed, and injecting the fuel at a second faster velocity when the engine is operating at a second faster speed.

Abstract: An internal combustion engine having a compressed air assisted fuel injection system connected between a source of compressed air and a cylinder of the engine. The compressed air assisted fuel injection system has an accumulator conduit with an injection port into the cylinder. The accumulator conduit has a length and shape to form a tuned reflection pipe to reflect a compression wave, which enters the injection port from opening of the injection port after combustion in the cylinder, and to deliver the reflected compression wave to the injection port at a predetermined period to assist in delivering fuel out of the injection port and into the cylinder.

Abstract: An internal combustion engine having a combustion chamber and a fuel delivery system for delivering fuel into the combustion chamber. The fuel delivery system includes a fuel entry proximate the combustion chamber and a combustion compression wave reflection conduit connected to the combustion chamber proximate the fuel entry. The reflection conduit comprises a variable effective reflection length.

Abstract: A two-stroke internal combustion engine having a compressed air assisted fuel injection system. The injection system has an accumulator that uses scavenged air from the crankcase as the compressed air source. The injection system has a valve connected to an exit from the accumulator. The valve is connected to a diaphragm with two diaphragm pressure chambers on opposite sides of the diaphragm. Both diaphragm pressure chambers are connected to pressure in the crankcase; one of the diaphragm pressure chambers by a flow restrictor.

Abstract: An internal combustion engine having a compressed air assisted fuel injection system. The injection system has a compressed air accumulator with a first aperture into the cylinder of the engine and a second aperture into the crankcase of the engine. The two apertures are located at opposite ends of the accumulator and the accumulator has a tube shape. The accumulator blows off pressure every time one of the ports into the cylinder is closed. The tube shape of the accumulator forms a tuned reflection pipe for a compression wave from the cylinder to generate a reflected compression wave for assisting in delivering fuel and air into the cylinder. The two apertures are adapted to be opened and closed by the piston head of the engine.

Abstract: A hand-held, portable device recommends dynamically preferred speeds for stabilizing or reducing undesirable vibration such as chatter in a machining process. The device may be applied to machining processes such as turning, boring, milling and drilling which exhibit a relative rotational motion between the cutting tool and workpiece. The device measures in a safe, non-contact manner via a microphone the dominant audio signal component of the sound pressure emanating from the machining processes. Without prior knowledge of the machining process parameters or the dynamic characteristics of the machine tool or workpiece, the audio signal is conditioned and processed to determine the frequency component levels. The rotational speeds which are more likely to lead to a stable machining process are calculated based on the number of teeth on the cutting tool and the identified dominant frequency of vibration. The dynamically preferred speeds are displayed as recommendations to the process operator or machinist.

Abstract: A two-stroke internal combustion engine having a compressed air assisted fuel injection system. The injection system has an accumulator that uses scavenged air from the crankcase as the compressed air source. The injection system has a valve connected to an exit from the accumulator. The valve is connected to a diaphragm with two diaphragm pressure chambers on opposite sides of the diaphragm. Both diaphragm pressure chambers are connected to pressure in the crankcase; one of the diaphragm pressure chambers by a flow restrictor.

Abstract: Disclosed is a tunable damping system for use in reducing vibrations associated with metal cutting and tooling. The tunable damping system may be located in a boring bar, an end mill, a modular tool section or the spindle/tool holder of the metal cutting machine. The tunable damping system incorporates a damper mass, elastomeric supports, and a means to lock the mass so as to determine tuning parameters. A tuner assembly consists of sensors and a microprocessor capable of recognizing the most dynamically flexible mode of vibration. The tuner assembly is also capable, through signal processing and microprocessor controlled algorithms, to direct the operator in implementing the proper tuning adjustments of the tunable damping system.

Abstract: Disclosed is a tunable damping system for use in reducing vibrations associated with metal cutting and tooling. The tunable damping system may be located in a boring bar, an end mill, a modular tool section or the spindle/tool holder of the metal cutting machine. The tunable damping system incorporates a damper mass, elastomeric supports, and a means to lock the mass so as to determine tuning parameters. A tuner assembly consists of sensors and a microprocessor capable of recognizing the most dynamically flexible mode of vibration. The tuner assembly is also capable, through signal processing and microprocessor controlled algorithms, to direct the operator in implementing the proper tuning adjustments of the tunable damping system.