Hello everyone.
A friend of mine who lives in Germany and drives at autobahns quite often says that these TDI engines burn oil like crazy at high RPM. E.g. you can burn a liter of oil in 2 hours @ 3500 RPM.
Analysis shows that TDI piston design may be contributing a lot to that: theere are no internal oil drain holes in the groves where oil separation rings are located. What is more, there are no external channels for oil drainage there too.
Operation at high(er) RPM results in oil bypassing the oilrings, compression rings and getting burned simply because once the oilrings scrape the oil off a cylinder wall, there's nowhere it can drain so that some oil manages to bypass the rings.
We examined quite a few other European brand diesel pistons and ALL of them had either oil drain holes or external oil drain channels there.
Then there came a theory that this may be done on purpose - to lubricate the cylinder walls and compression rings at high RPM to avoid excessive wear on the engine.
Any ideas, comments?
Would really love is experienced people such as Pete (Drivbiwire), Frank (Franko6) and others would chime in with their opinion.
Thanks!
A friend of mine who lives in Germany and drives at autobahns quite often says that these TDI engines burn oil like crazy at high RPM. E.g. you can burn a liter of oil in 2 hours @ 3500 RPM.
Analysis shows that TDI piston design may be contributing a lot to that: theere are no internal oil drain holes in the groves where oil separation rings are located. What is more, there are no external channels for oil drainage there too.
Operation at high(er) RPM results in oil bypassing the oilrings, compression rings and getting burned simply because once the oilrings scrape the oil off a cylinder wall, there's nowhere it can drain so that some oil manages to bypass the rings.
We examined quite a few other European brand diesel pistons and ALL of them had either oil drain holes or external oil drain channels there.
Then there came a theory that this may be done on purpose - to lubricate the cylinder walls and compression rings at high RPM to avoid excessive wear on the engine.
Any ideas, comments?
Would really love is experienced people such as Pete (Drivbiwire), Frank (Franko6) and others would chime in with their opinion.
Thanks!