Ceramic Valves Engine

C lube is a thermally cured dry film lubricant designed to provide high pressure lubrication to surfaces subject to sliding rotating or oscillating motion such as piston skirts and gears.

Ceramic valves engine.

An evaluation of engine valves made of solid ceramic materials for use in an uncooled di diesel engine was conducted. Intake manifolds intakes are coated on the bottom with the oil shedding coating to cut thermal transfer from the oil to the intake charge. This study evaluates how the higher engine speeds and lower valve spring loads that they permit contribute to higher engine output and greater fuel economy. The lighter weight contributes to minimized wear on rocker arms and improved valve.

Intake valves usually do not suffer as severely as exhaust valves which see combustion chamber temperatures. First a finite element analysis fea was conducted for both steady state and transient conditions. The ceramic coating is a durable hard coating intended to protect the titanium from the friction. Ceramics are used in engine applications where there isn t any impact or tension loading ceramic ball bearings turbos are a good example as well as valves cams etc.

Interest in and experimentation with ceramics in the internal combustion engine ice goes way back. Two candidate ceramic materials were chosen. The evaluation was undertaken in three phases. Advertisement exhaust valves may be made from a martensitic steel with chrome and silicon alloys or a two piece valve with a stainless steel head and martensitic steel stem.

Valves allow for higher engine speeds and will accommodate highly aggressive camshaft profiles. This reduces the friction particularly in engines where oil flow is restricted to the head. It also evaluates their reliability in the presence of valve bounce and other adverse conditions that ceramic valves normally fail to withstand. C lube dry film ceramic lubricant combines the durability of a ceramic resin with the lubricity of a ceramic lubricant.

Yttria partially stabilized zirconia psz and sintered silicon nitride si 3 n 4. Therefore the primary concern is lubricating the valve stem and seat. We do this by the application of a dry film lubricant. The coating is also designed to aid in the more even transfer of heat reducing hot spots.

Due to the thermal insulating properties you can also find ceramic coatings in engine areas that need to withstand high heat like pistons or exhaust headers but this is typically not standard because of the increased cost of production. Valves the valve faces are coated with the same barrier as the piston tops and combustion chambers. Ceramic and ceramic head valves have been demonstrated for use as exhaust valves at only 40 percent the mass of steel valves but the brittle failure mode of ceramic versions can have devastating consequences on the engine.