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Why do exhaust valves get damaged more easily in bi-fuel cars

Model: (Various brands) Various
Part: Engine

In this video we see why engines running on LPG and methane are more likely to have damaged exhaust valves: we see in the cylinder head that the smaller valves are the exhaust valves, while the larger ones are the intake valves, and they ensure a tight seal during the compression and combustion phases. But why do exhaust valves get damaged in bi-fuel engines? The intake valves come into contact with fresh air, while the exhaust valves, when they open, come into contact with very hot air due to the end of the combustion process. In these types of engines, combustion occurs at significantly higher temperatures, and the combustion is longer compared to gasoline cars. Therefore, the exhaust valve will also come into contact with combustion residues, which will damage it very easily, and no longer guarantee the seal of the cylinders, leading to gas leaks from the valves. The remedy is to sinterize the valve seats. A typical characteristic of bi-fuel engines.

Posted on 2 April 2024 by ScegliAuto

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