can bike start with no oil?
#11
01-30-2011, 04:32 PM
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Here is what will happen. The spacing between the connecting rod bearings and rod journals as well as the spacing between the crank bearings and crank journals is small. That space is filled with an extremely thin layer of oil. Oil can't be compressed so this thin layer becomes a link between the two but also lets the rod or mains bearings spin around the journals. Without the oil filling the small void, when a cylinder fires, the piston is slammed down, in a violent explosion, against the connecting rod and in turn slams the rod bearing against the rod journal. This smashes the bearing material to the point that the spacing gets bigger and the slamming gets worse. This continues until all the bearing is smashed out. Then the rod starts to trash the journals and the entire crank needs to be replaced as well as connection rods. Depending on RPM and engine load, it can happens in seconds.
Always check your oil.
Always check your oil.
nice one Tim , I liked reading that mate ...
kinglee86, as far as that metal to metal noise is concerned ...it would not have been the pistons and rings mate
.... or she would do it on every start as they drain dry every time you stop the engine ..More than likely it came from the cam gear , guides and tensioner ect ect and should not be a problem unless you knackered something when you ran her dry
#12
01-30-2011, 08:20 PM
It's happened on a few friends bikes, sump plug falls out & if the leaking oil does not cause an off, they usually just keep going unawares until the bike overheats & stalls. This has only ever happened on air cooled twin & multi, maybe water cooled may make a difference?. But after reinstalling a plug & oil, the bikes seemed to survive ok, although long term??
#13
01-31-2011, 11:24 AM
Oil is cheaper than a new engine.
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