Originally Posted By: Blue_Angel
Originally Posted By: Gokhan
So, CATERHAM is probably right that bearings are where the oil pressure is mostly determined.
You can see this
paper for some info but there is not much detail.
I disagree... that paper shows in GREAT detail where the oil flow is most prominent!
On the last page there is a graph showing oil flow distribution in the lubrication system vs. RPM. Reading the values at 4000RPM (linear up to that point, just before the bypass valve starts diverting flow), the total oil pump flow is about 14 L/min. Out of that 14, about 7.5 is going to the main bearings and about 2.5 is going to the camshaft bearings (cam bearings are journal bearings too).
So in total, about 10/14 L/min is flowing through journal bearings, or over 70%.
Now it seems the only argument between KV and HTHSV WRT journal bearings would be; what percentage of bearing flow is side leakage at the wide end, and what percentage is flow at the wedge?
Based on Shannow's comments (ie the bearing will take what it needs), for a given supply temperature I would think the side leakage at the wide end will be more dependant on the supply pressure and the oil's KV, and flow at the wedge will be more dependant on bearing load/RPM and HTHSV.
Shannow, am I on the right track?
Shannow, any insight?