Re: New Angle On Oil Consumption?
Just something on general oil consumption. Balancing all the potential oil losses, the biggest one is the CCV (crankcase ventilation).
After ignition a small part of the combustion gaz flow throught the piston rings. This amount of gaz is linked to the compression ratio and the quality of the piston rings.
Then this gaz enters the oil crankcase and the cylinder head & it forms a spray with oil dropplets. As the crankase as to stay at a pression lower than the atmospheric one (sealing and rejects in atmosphere issues), this gaz is recirculated into the air intake line to be burn. To limit oil loss the spray is treated in cyclons or impact chambers to remove the oil (the oil goes back to the crankase) before being reinjected in the air intake line.
So in my own what could cause this oil consumption compared to other cars is:
- higher compression ratio ( at least for the JTS it is trully one of the bigger) & a separation area that is not well design for these higher flow rates
- piston rings : maybe too-high accepted tolerances for parts (this could lead to a hudge dispersion regarding oil consumption with at the end a part of the produced engines that looks like more to big oil pump than a real engine
- quality of the design of the oil separation area: a lot of oil is not removed before the gaz enters the intake line
As I never worked for italian OEM I do not have any idea of what could be the cause...
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