Ενταξει ειναι μερικοι συμφορουμιτες που δεν ξερουν και πολλα περα απο το να τρολαρουν!
Για να μην γραφει ο καθενας οτι π@παρια του κατεβενει:
Microwelding
Metallurgy shows us that any two similar metals that are truly clean (right down to a molecular level) will begin to stick back together if left touching for any length of time. The longer they are left this way (when the engine is not running), the more similar the metals are, and the cleaner their surfaces are, the more quickly they will begin to Microweld.
When two Microwelded surfaces are pulled apart, molecules of metal are pulled from both, resulting in surface damage. After prolonged surface damage due to Microwelding the valve head and seat may not produce a gas tight seal any more. The simplest way to prevent or retard Microwelding is to add 'Dirt' to the surfaces of the two pieces of metal. That 'Dirt' could be the Oil we use to stop things siezing up, it could be Polish or Paint of some kind, it could also be the Soot produced by burning some fuels. It is convenient that Petrol combustion produces lots of carbon (Soot) whereas it is a little inconvenient that LPG burns much cleaner than Petrol and does not leave Carbon deposits. Thus, the cleaner combustion of LPG and other fuels (CNG for instance) can actually promote Microwelding!
Αρα το γύρισμα στην βενζίνη πρίν το σβήσιμο του κινητήρα ειναι πολυ λογικο να παρεχει προστασια αφου η βενζινη αφηνει καταλοιπα (Soot) στις βαλβιδες και ετσι αποφευγετε το φαινομενο Microwelding !