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> SINUS Solution For Natural Gas Engines


Abstract


Natural Gas driven engines are the result of O.E.M efforts to provide an environment friendly, economical and durable solution for motorized vehicles. Natural gas engines are highly common nowadays and can be found in passenger (hybrid) vehicles, heavy duty trucks and buses, marine applications, and stationary industrial engines.

Alongside to new engine releases by the O.E.M, engine conversion from petrol or diesel to natural gas is increasing with every year that passes. Some major cities throughout the European Union prohibit driving in central metropolitan regions for vehicles that are not environment friendly.

Both CNG (Compressed Natural Gas) and LNG (Liquefied Natural Gas) engines output extremely high temperatures. Poppet valves installed in such engines should feature extremely high temperatures resistance capabilities in order to function efficiently for long duration.


Phenomenon


Companies that handle the conversions of petrol or diesel engines into natural gas engines have addressed SINUS notifying on a repeating phenomenon that subjects that poppet valves.

It appears that aftermarket and O.E equivalent valves can’t handle the engine temperatures well enough. This fact causes to a far decreased valve lifespan creating the need for constant valve replacement, dramatically subtracts the engine efficiency highlights.



Objectives


To form an empowered set of valves that features enhanced heat and wear resistance properties which will stand up to the increasing engine temperatures outputted by natural gas engines.



Solution


SINUS engineering department came up with yet another superior engine valve configuration that managed to overcome the boundary conditions set by natural gas engines.

For evaluation, a natural gas engine of a highly common passenger vehicle was selected. For the sake of experimentation, 10 vehicles using the aforementioned engine were randomly selected and installed with SINUS designated valves.
The common denominator of all 10 subjects was that all O.E valves that were originally installed, burned at around 30,000Km.

The usage of selected nickel superalloys as the valve raw material was the first block against the massive heat produced by the natural gas engine in hand.

SINUS coating development team deposited the valves with designated Chromium Nitride (CrN) coating which dramatically enhances the valves heat resistance property and also increases the valves hardness level to 1500Hv.

The valves were then superfinished with SINUS SnakeSkin Superfinish™, an innovating friction reducing process that creates a solid oil reservoir layer on top of valve’s top surface.

All 10 subjects were then installed with SINUS superior version and initiated road test of several months. All 10 subjects have successfully passed 100,000Km without meeting the phenomenon reported initially.