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YOUR RESEARCHScavenge Pump Protection Method?
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Use variable timing mechanism
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No the oil is not under pressure as it is the return path after lubing the cams and being used for the variable timing mechanism.
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Hello, I'm interested on thoughts on this method of adding some protection to the scavenge pumps.
What I did was add four, 10 lb. pull Neodymium Magnets, to the outside of the valve covers on the oil flow channels to the pumps. If you look at the picture below, the oil in the head flows across the bottom of the head to the left, then down to the lowest point, then up to the scavenge pump inlet (yellow lines).
What I did is add two magnets on each valve cover, one at the lowest point in the oil channel, and one directly before the scavenge pump inlet (red arrows). The actual pump would be located located at the blue arrow.
I stuck the magnets to the two machining blocking caps that are located in each spot. These are strong magnets. My hope is they would catch any failed ferrous metal head parts before they made it into the pumps, and caused damage or cam stoppage. I actually could have purchased larger magnets for an even stronger protection?
Here are the attached magnets:
Bottom of valve cover oil channel to pump.
Right before pump inlet.
Hoping if I did have a failure, one of these would catch the debris for at least long enough for to get the engine stopped.
Cheers.
I presume the oil is under pressure in those passages? What do you suppose is the velocity of the oil as it traverses those passages? My concern would be that the viscous oil, moving at a high rate of speed will not allow the debris to be attracted to the magnet as it hurtled past. A sump magnet is another story since it is not under pressure in the sump.But, like the proverbial chicken soup remedy, it can't hurt!
No the oil is not under pressure as it is the return path after lubing the cams and being used for the variable timing mechanism. They're in path the oil follows after it collects in the bottom of the heads and then gets sucked up into the scavenge pumps. I'm not sure of the volume of or speed though.
Yep, I've been doing this for years on my engines in hopes of catching a piece of spring or lifters or timing chain roller , ect. to keep from locking up the scavenge pump ( which can lead to failed timing chain, IMS , and catastrophic engine failure). Cheap insurance that you hope you never need !!
I see two issues with this concept:
1) If it does work and you do manage to catch some debris with the magnets, should the magnets ever get removed or lose their magnetism for some reason (see below) you've now introduced a
clump
of debris into the oil, rather than the occasional small particle.
2) Neodymium magnets lose their strength as they get hotter, and if you pass a certain threshold that loss is permanent.
https://www.first4magnets.com/tech-c...um-magnets-i91
Personally, I think you're better off epoxying the magnets to your oil filter housing so you can remove any catches at each oil change.
I have a bunch of magnets on my motor. I have a few on the bottom of the sump plate RTV'd and sandwiched in place with an AL plate. I also have some wrapped around my oil filter housing (stock plastic), held in place via silicone gasket and a circular clip.
The magnets are from an electric drivetrain motor from an old honda, so seem to be completely heat resistant. Also very strong.
Seems to work, I haven't pulled the sump base off yet (might do next oil swap) but the filter ones attract a fine soft ferrous spoodge that clings to the side of the filter housing, preventing it from sinking to the bottom (where the bypass is) and also reducing the clogging of my oil filter, which lessons the risk it will generate a delta P large enough to allow the bypass to open at all.
I have one more attached to my gearbox drain plug, which allows me to assess how much wear material is coming out of the transmission, also keeps the oil cleaner.
Installing magnets on the oil filter housing will help filtering but does nothing to keep bits out of the scavenge pump that are created in the head.
The purpose of installing magnets (or screen) pre-scavenge pump is not for filtering of small debris , but rather for catching a piece large enough to lock up the scavenge pump,which would likely be catastrophic
Acording to your chart any neodymium magnet with a (x)H suffix would be adequate..
