About the bypass valves in the filters, or engine, and dual remote filters, the guy that said that the cold oil would affect how the bypasses worked had it right. If the oil's cold it won't go thru the filter so the bypass opens to let oil to the engine. Wouldn't be a good idea to run engine without oil till engine warms the oil.
Perhaps ..but you're going on the assumption of an empty oil filter pushing into a void. This is rarely the case. You have no idea of what back pressure the downstream oil system puts on the media. The filter oil sees the differential. It's also experiencing a radical drop in velocity in the filter can. If you strectch out the filter media into a panel (like many of out air filters have) you would have a, less than, 1/2 diameter flow spreading out over 90-150 square inches of media. Sorta like being on a one lane highway and then having the road broaden out into 50 lanes wide ..and then choking back into 1 lane again. Traffic, so to speak, is at a crawl through the filter.
The filters with built in bypass bypasses unfiltered oil to the block. Block with bypass that use full flo filters will pass unfiltered oil to the block till the oil is warm enough to pass enough oil thru the filter to close the bypass.
See above
The amsoil remote dual filter has a full flo and a bypass filter, right? I think the spring and ball in the body is a bypass for the full flo filter. If the oil is cold the bypass opens to let oil to the bypass filter. If the oil is too cold for that filter to let enough oil thru the built in bypass will open.
Not really The sprung restriction is to force flow to the bypass when the oil is warm. The oil pump
IS going to pump what it is going to pump. When warm ...it flows like water. If they didn't have that sprung restrictor ..it would take many miles to accumulate enough resistance in the ff for it to route enough oil through the bypass filter. The flow divides based on resistance. I KNOW this since I ran these filters in parallel without the sprung restrictor. The bypass barely got hot when new ..when the sump had 7k on it ..both were hot.
A engine doesn't use/flo the same amount of oil at all RPMs. Looking at the heads with valve cover off you can see that. The higher the rpm the more oil flows thru the bearings. The higher the rpm the more oil passes thru the pump.
Oil pumps are postive displacement pumps xx rpms ..xx gallons of flow. The limits in volume are due to rpms or the relief settings on the internal relief springs in the pump. Terminal pressure is a different matter.
Oil pressure is the pressure between the pump and the oil channels. If there isn't enough flo thru the filter to pressurise the path between the filter and oil channels to within the 3, 8, or 20 lbs of the path between the pump and the bypass, the bypass opens to allow oil to the engine. If the pre bypass is 20 lbs pressure, the bypass will open if the post bypass is 3, 8, or 20 psi less, and the same applies at 40 psi or 80 psi or 120 psi.
I'm not sure I can catch everything you said there ...but X gpm of flow through a given conduit produces XX psig. Since we're dealing with "flow dictated" dynamics, most of our perceptions of "pressure/resistanc" models are somewhat moot. The changes are more along the line of changing velocities. The flow remains the same (LZ -the song remains the same).
The DR's larger micron bypass filter filters the bypassed oil from the smaller micron full flo till the oil warms up enough to pass thru the full flo.
Help me out with this just a little
I would think a small electric oil pump to prime the oil passages would be better than filtering the bypassed oil from the full flo for only a few minutes. Something like a pre-oiler used for newly built engines.
This part I can agree with. At least to the point that a preoiler does some good things.
Help me out with the rest of my confusion
