Why do some engine types suffer VSR when others do not?
If the factors above have been understood it is clear that there are two differences between running an engine on Petrol or LPG. Microwelding In essence, valve wear will occur slightly more quickly when running on LPG simply because it burns much more cleanly. There is no Soot or Dirt to prevent the occurrence of Microwelding. Don’t let that worry you, this effect alone is very small. We are still talking about Valve life that is often longer than the life of the car. Microwelding can be avoided, at least in part, by having the valve head and seat made out of metals that are as dissimilar as possible. Carbon steel valves and Stellite seats provide a good solution here. Another weapon in our anti-Microwelding arsenal is provided by fuel additives such as ‘Flashlube’. These come in the form of light Oil which, if introduced in the correct dosage can lubricate the valve head/seat faces and prevent Erosion. Also worth mentioning is that the Flashlube oil will eventually burn. When it does,
