| …Cylinder Air-tightness |
| The NEWEN FIXED-TURNING® and its numerical control allow to adjust angles one hundredth of a degree at a time. It is therefore easy to adjust the angles of the valve seats and of the valves in order to obtain a perfect and lasting air-tightness, without giving in to the destructive temptation of lapping and, consequently, of deforming the shapes of these parts. |
 |
| Alignments and coaxialities |
| Elevated engine speeds, rapid accelerations and decelerations are made possible owing to the reduction of the masses in movement with high-performance valve recall mechanisms. But all these performance are only possible owing to a drastic reduction of frictions and bracing of parts in movement, valves, cam-buckets, intake cam… forgetting the controlled functioning of the valve recall system.
Aside from the circularity of valves and valve seats, the coaxialities of the valve guides, of the valves, of the cam-buckets and of the cams shall allow the movement of all these parts while eliminating:
Contrary to generally accepted ideas, it is not possible to control the concentricity between a valve seat and a valve guide by forcing a tapered pilot within a guide and using this pilot as a support for the concentricity gauge. It is even more improbable to use the same technique to allow a tool to bore a cam-bucket bore housing concentric to the valve guide, the essential condition to a good performance of the engine. The kinematics of the NEWEN FIXED-TURNING® includes a hydraulic centering of the centering pilots that allow the machining spindle to center with a defect not exceeding a few microns (µ=0.001mm = .000039"). |
| Previous Page | Next Page Back to Top |
