Originally Posted By: ThirdeYe
Originally Posted By: SuperBusa
Originally Posted By: BigCahuna
I think it really depends on the bike. My Harley's oil pressure runs between 35 pds hot running, and 10 pds hot at idle. My '82 wings oil pressure is supposed to run around 60 pds. So other brands of bike must also vary.As long as the bike filter isn't twice the price of the std filter I wouldn't be bothered much by it.,,
The bike's max pump output pressure all depends on the pressure relief valve setting on the oil pump - same basic setup as most automobiles on the road.
Let's assume the oil pump's pressure relief valve is set to 70 psi. This means that the max possible oil pressure obtainable would be 70 psi going into the oil filter - no matter what the oil viscosity or flow volume is.
If the oil was hot, and a cycle specific filter gave you 35 psi running, and a different filter gave you 50 psi running, then the flow volume going through the system is still the same because the pump has not yet hit its relief pressure setting of 70 psi.
Okay, correct me if I'm wrong because I don't know much about the specifics of an oil pump and filter, but basically what you're saying is that the oil pump compensates for an oil filter's "restriction" by simply providing more PSI to allow for the same amount of oil to flow through the filter?
No the pressure will rise until the oil pump bypass opens due to the restriction and the flow will be reduced out of the filter. The volume would never increased. yeah I don't see what the pump bypass valve has to do with it anyway. The bypass valve may be closed and the pump may be able to reach maximum pressure but if it is meeting a restrictive at the filter, then it's not pumping as much volume and there will be a pressure drop downstream of the filter.
I'm not saying you can't run an automotive filter on a bike or that it would restrict anything, I'm just saying if the pressure increased due to a restriction the volume would drop. Volume is fixed by oil pump size and RPM, pressure is determined by restriction and limited to the bypass setting. If something more restrictive was added volume would drop and not really be compesated for (you would have to raise the bypass setting), and pressure and volume would be reduce downstream.
Maybe a classic Purolater would be a betetr choice being less likely to clog and having a lower bypass setting? Although I'm not sure if it's lolower efficiency would compesate for maybe having a lower holding capacity.