It was a long filter like this rather than a spin on. The bypass valve was built into the filter housing. Not so obvious but this is the actual crushed filter before the media and end caps were stripped off.
Oil filter crush temperature, with no bypass.
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It was a long filter like this rather than a spin on. The bypass valve was built into the filter housing. Not so obvious but this is the actual crushed filter before the media and end caps were stripped off.
MolaKule
Staff member
Good illustration. At one trucking company, I have seen the media "cage" end caps completely separated from the media cage but the cage was even more distorted.
Cool! How did that one happen?
Yeah I have been using the 9100 size oil filter on old gm products forever. With paper filter it was like a dollar more to get almost double the oil filter.
Oil at -5 deg C and inadvertent excessive revs after starting. The oil pump on my old BMW motorcycles shifts 16 liters per minute at even moderate revs. There is a filter bypass valve but it's quite small and a relief valve set at 74 PSI but a system pressure in excess of 100 PSI is normal with cold oil even at much higher ambient temperatures.
Oh wow only -35c that's not even cold.
16L per minute seems quite excessive for a bike engine.
It is high but perhaps it helps explain why the bottom end of these engines will do 200,000 miles with ease which is not usual for a motorcycle. When raced the oil pump consumes so much power at high revs it has to be modified to pump less oil.
MolaKule
Staff member
The flow rate is about 300mL/s or about 10 ounces/s so that doesn't seem overly excessive for a performance oil pump.
That was supposed to say -5c and it auto corrected to -35c.
More accurately, it's an over delta-pressure across the media and center tube, not an actual internal over pressure inside the filter for the outside can to handle. The pressure on the dirty side of the filter could be 100 PSI (not over pressure for the can) and only have 15 PSI of dP across the media/center tube. Or the pressure in a different operating scenario on the dirty side could be 150 PSI (not over pressure for the can) with the dP across the media/center tube well over 15 PSI and enough to crush ("implode") the center tube - especially if there is not a filter bypass in the filter or system.
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MolaKule
Staff member
Yes, internally it is the Delta pressure that crushes the cage.
The point is, it was a differential pressure that crushes or distorts.
Fresh oil, didn't catch the weight they were using. Filter was a big old 51515 or 91000 size, much bigger than what most engines run. Developed some psid even at room temperature. I bet an engine would develope a lot more psid below freezing with a partially dirty filter.
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There's a whole thread on that video in the Oil Filter forum.
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Any excuse to pull a LS jr video.There's a whole thread on that video in the Oil Filter forum.
Someone should leave a comment recommend he make nursery safe videos.
