I have been talking to people and have heard some stories about what are likely myths about timing belts. I was wondering how true some of these were.
A timing belt is more likely to break at idle rather than going down the road at a higher RPM. People say they always seem to break at stoplights and such when they are just sitting. Is this true? I guess the spring pressure on the lifter could essentially cause the camshaft to outrun the crankshaft in certain conditions. This sounds like it is the issue in the Chrysler V6 3.9L used in some RAM and Dakota trucks. I can see this being at least partly true.
Less or no damage will occur if it breaks at idle. I personally don’t think this is right. I have heard about people trashing valves by rotating the camshaft during a timing belt change. Maybe a little less damage and carnage but the cost of repair is likely the same as the same parts will be damage. Any opinions?
Some interference engines are a little more forgiving than others. Some Honda/Acura engines that were supposedly interference came through a timing belt failure without any issues. Are some engines more interference than others? I could see this being the case if an engine is interference for only a small degree of rotation of the cam/crank. I could see some getting lucky and not trashing an engine in certain cases. It sounds like any Daewoo product is not at all forgiving to a timing belt failure. These include the Chevy Aveo, Suzuki Forenza, Suzuki Reno, etc. It sounds like there is no going back on one of these if the belt fails in operation.
Any opinion on these?