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Urban legends

A gáz szárazon ég
  • The gas burns dry and does not sufficiently lubricate the cylinder and valve stem.

    • It is not diesel or gas and especially not gasoline that lubricates the cylinder and the valve stem.

    • By the way, when gas is burned, more water is produced compared to diesel and gasoline. However, these have nothing to do with cylinder and valve stem lubrication. The engine is lubricated by engine oil, which has nothing to do with fuel. 

    • Diesel oil has a kind of lubricating effect, but not on the valve stems, where it cannot reach.

    • It does not have a lubricating effect in the cylinder either, because before it reaches the cylinder wall, it is already enough.  What's more, the soot and other particles produced during the combustion of diesel only worsen the lubricating effect of engine oil.

  • Gas burns at a higher temperature, causing more damage to the engine and valves:

    • The engine's cylinder wall and valves are made of steel with a melting point of 1,520-1,640°C. The piston is made of aluminum with a melting point of 560-660°C. A gas engine piston has not been known to melt. During the explosion phase, the temperature is the highest (there is a flame), but then the valves are closed, so there is no outflow at the edges of any internal combustion engine, provided that the valves close well!

    • At the end of combustion, the temperature of the flue gas, especially at maximum torque, is almost the same as that of a gasoline, gas or diesel engine, given that their calorific value is almost the same.

    • It used to be the case that vehicles were refueled with ordinary PB gas at home. The sulfur content of this can be significantly higher than that of car gas, which could result in the generation of sulfuric acid during combustion. 

  • The gas engine has a shorter lifespan:

    • On the contrary. On the one hand, the reduction in the lubricating effect of engine oil is smaller than in gas engines, so this has the effect of increasing the service life. On the other hand, the mechanical load of a gas engine converted from a diesel engine is lower in gas operation than that of a diesel engine. Since the diesel engine was designed for greater use, after the conversion, the fuel burns evenly rather than knocking, and the load resulting from the lower torque is also lower, so this also has the effect of increasing the service life. After the conversion, the piston speed is higher during acceleration, at high power due to the higher revolutions, but this does not reach e.g. the piston speed of a passenger car, i.e. it does not represent a significant disadvantage mechanically.

  • The gas engine can freeze when cold:

    • To be precise, it is not the engine that freezes, but the LPG gas reducer. This is due to its special structure. In our system, a special 24V reducer preheater takes care of the cold start. If the engine has reached approx. 12°C, then reducer preheating is no longer necessary. Typically, the engine runs without preheating when starting cold or restarting above 12°C.

A gáz szétégeti a motort,
A gázmotor rövidebb élettartamú
A gázmotor hidegen lefagyhat
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