oil pressure to low for running a bypass filter?

[truK]

hi there, just wondering if i could get some advice. Im trying to work out how much oil pressure/volume will be affected if i fit an oil bypass filter setup (AMSOIL looking at BMK-11). Plan is to tee off the pressure sender and return the oil back into the sump. I have an 80 series Land Cruiser (4.2L turbo diesel 1HD-T engine) which doesnt seem to have the greatest oil pressure at the best of times according to the standard pressure gauge. To what extent will a bypass filter affect the system oil pressure and also what sort of volume of oil is going to be taken out the the lubricating circuit? Is it is substantial enough to be a cause of concern? Any help would be most appreciated!

 

[RalphPWood]

It shouldn't be a problem. Sometimes you will get a false reading on your oil pressure gauge because of teeing off at the oil pressure sender unit. It isn't common for the oil pressure to be reduced by the bypass filter unless the bearings or the oil pump are worn out. A little oil pressure reading on the gauge at idle is all you need.

 

[Gary Allan]

There's a restrictor built into the mount (actually the fittings). That, and the skinny oil line, keep the flow in check. The actual volume will be variable, naturally ..but is somewhere between 5-10%. Just plumb your sender at the sender port. One member moved the sender out to a tee near the filter. That is, he remote mounted the sender. It played no role in altering anything except for the point of reference for pressure. As the oil heated up and flowed easier, the line (the skinny line) ended up being part of the equation and dropped pressure.

 

[D-Roc]

I can't see it in my application (06 Dodge Cummins). Supply for the bypass comes out the top of the full flow, and the orifice is quite small. I read in the instructions when I did mine that the sender should be used, but they had revised it and sent an additional publication out to tap the top of the full flow mount. I like that place better. This is where we generally install Spinners on the CAT's that I work on.

 

[truK]

thanks for the replies, seems like i should be fine! Now i just have to decide on which full flow filter to use (unfort amsoil full flow filters dont have a filter for the turbo diesel land cruisers), at this stage leaning toward baldwin or genuine toyota. Thanks again

 

[RalphPWood]

My 38 Chevy had almost no oil pressure but bypass filters were offered as optional equipment equipment. It had ports for the bypass filter. All you had to do was remove the pipe plugs. I did a marine generator awhile back that was equipped for an optional bypass filter. I removed a plate from the block and there was two ports for pressure and return. I hooked up the two hoses for the filter. The stock bypass filter needed no hoses. The orifice was in the center tube. It is difficult to impossible to find good elements for the old housings. You could get adapters to convert to superior submicroscopic bathroom tissue in the 50's. I have a General Motors bypass filter off a GM truck that I converted to use TP on my lawn mower. It is messy to change but I only change it once a year and add a quart of oil. It has a very small orifice at the inlet. It's a beauty that has been in a box for over 40 years. It bolted to the engine block. My Nissan diesel uses a sandwich adapter. An orifice isn't needed with a sandwich adapter because you have no oil being pulled off the oil system. The filter filters at it's own pace before going to the full flow filter. The rest of the oil the engine needs goes directly to the full flow filter through the relief valve in the adapter. It's a little more complicated on the engines with the relief valve in the filter mount like most GM cars. The oil can bypass both filters and go directly to the engine parts. You have converted back to the old bypass system which isn't so bad if you have a clean engine. I have been reluctant to use smaller orifices than is recommended because of the danger of them clogging. It shouldn't be a problem when you understand that the orifices that squirt oil up to the piston tops are very small. You can get a lot of oil through a 1/16" orifice. I had a Mazda diesel with about a 35thousands orifice in the stock filter. There is a good chance that if a customer gets a clogged orifice he might not notice the filter isn't getting hot. He will eventually notice the oil has stopped getting clean and give me a good cussing.
I wanted to use a sandwich adapter with a model MG-30 on a four cylinder Cummins at work. There was an exhaust manifold too close to the full flow filter. I could have made it work but on the other side of the engine there were bolt holes to mount the filter to the block. There was a 1/8" pipe plug for pressure and I welded a fitting in the fill neck for a return. The 8.3 Cummins are similar.
Zero spillage when changing.