FIXED-TURNING: HIGH PERFORMANCE

FIXED-TURNING® and Numerically Controlled Machining
The cylinder head, neuralgic center of the engine, gathers all the functionalities that determine the power, the flexibility and the longevity of the engine... The cylinder head is the center of preoccupation of engine developers and repair specialists. NEWEN, the FIXED-TURNING® and the numerical control bring unavoidable and irreplaceable solutions to multiple technical challenges that cannot be solved with older and/or traditional technologies.
Combustion Chamber Volume
The volume of the chambers, their value in cm³ (cubic centimeters or CC) and their concordance between one another within one same engine is a decisive element for the output of each cylinder to be optimum and balanced. Only chambers perfectly similar in volume and shape shall allow output levels and harmonies necessary to the elevated speeds of high-peformance engines (refer to "HCCI" technology on page 6.
	NEWEN^®
	The FIXED-TURNING® and the NEWEN numerical control allow very high precision machining operations. Valve seats and their specific profiles (Intake and Exhaust) can be duplicated within 1/100mm (0.01mm or 0.00039"), the machining depths are controlled automatically with an electronic depth gauge and a very high precision kinematics. The precise volumes of the chambers are guaranteed by corresponding shapes and perfectly identical depths.
Cylinder Air-tightness
The instantaneous air-tightness of the cylinder is essential to the optimum functioning of the engine and to reach elevated speeds. The metal to metal contact between the valve and the valve seat must be complete and perfect to ensure this difficult air-tightness function. Aside from the quality of the materials that will accept elevated speeds, the metal to metal contact between the valve and the valve seat is the sine qua none condition to obtain a perfect and lasting air-tightness of the cylinder. The perfect shape correspondence between the valve and the valve seat is allowed by the total respect of the geometries (shapes, angles, surface finishes...) of the two surfaces in contact. Only the high precision machining of the valves and of the valve seats allows to obtain this essential correspondence. The lapping of the valves, which became mandatory in the past because of the lack of precision of the machining of the valve seats and of valves, is strictly proscribed to get the air-tightness levels and the durability of said air-tightness. NEWEN, the FIXED-TURNING® and its numerical control allow to machine valve seats presenting a shape defect (circularity) in the order of 3µm (or .003mm or .000118") or less depending upon the materials machined. OEMs require circularity defects not exceeding 5 to 6µm both for valve seats and valves.
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FIXED-TURNING® and Numerically Controlled Machining