High Clearance Valve Assembly
A high clearance valve assembly
is used to increase the fixed clearance volume of a cylinder end. A high
clearance assembly is comprised of a valve spacer, a special retainer
and a gasket. The spacer is placed between the cylinder valve seat and
the valve body.
The cylinder DataBook lists the
number of high clearance assemblies that can be provided with each cylinder
and the percent of added fixed clearance for each assembly. A new cylinder
purchased with high clearance assemblies will also be supplied with standard
valve retainers.
Cylinders of the class 3SG-CE
and 3-5/8SG-CE show the availability of high clearance valve assemblies
in the performance software. These
cylinder classes do not use the traditional spacers as shown above, but
utilize high clearance crank end head designs to add the clearance. The
clearance defined for these cylinder classes are machined as part of the
cranks end head and are not removable valve spacers.
Hanging guard design valves cannot
be outfitted with high clearance valve assemblies. Gas flows around the
circumference of these valves. Installing a spacer would block the gas
flow.
Below is a drawing of a hanging
guard design valve.
Also see:
Clearance
Volume
Ariel
Corporation Application Manual
23 October 2008