controlled by Pivot bearings.
In order to convert
combustion pressure into torque, the piston slides within the
cylinder restrained and supported by it's skirt. The clearance
required for expansion makes it possible for the piston to rock
and slap in the cylinder, causing the compression seals (rings)
to become unseated from the surface of the cylinder.
With the Pivotal
Piston fully under control there is no more piston rock or slap
and the compression seals are always held at a normal orientation
to the chamber walls. This improves the compression sealing and
extends the sealing life.
The Pivotal Piston
is restrained by pivot bearings and it is now possible to allow
sufficient clearance for piston expansion to remove the risk of
seizure, without incurring damage during cold running.
As the Pivotal Piston
no longer acts as a bearing, the friction between the piston and
cylinder is greatly reduced. This also leads to an increased service
life and a considerable reduction in lubrication requirements.