| Intake Profiles |
| After the explosion of the mixture (fuel-comburant), residual gases from the combustion fill up the cylinder and must be evacuated through the exhaust ducts, expelled by the piston that is coming back up towards its high point. The exhaust valve shall close progressively prior to the piston going down again, aspirating some fresh mix again in the process. This closing period is critical for the exhaust valve. Gases heated to an extreme temperature are in addition
laminated between the valve seat and the valve that is closing.
The valve seat and the valve are subjected to the abrasiveness of the laminated gases and the temperature is then at its height on the surfaces that will ensure the contact and the air-tightness for a few thousands of a second. In order for this contact not to correspond to a rapid degradation of the surfaces in contact, it is necessary that these contact areas be optimum in surface (mm2) and that their forms be complementary (angles, circularity, surface finish…) |
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