![]() As we know there is more to it than that. There are some members who think the reason for a anti-drain back valve just to keep the oil filter from emptying and that a vertical filter takes care of the issue. Https:/ / forums/ ubbthreads.php/ topics/ 4749537/ Fram_EG_with_no_ADBV Been several threads on that application. Honda has some vertical thread end up applications and they do spec an adbv.įram actually has an orange can application that's been posted several times this subforum that has no adbv. No where in my post did I state ALL thread end up applications use no adbv. One will find the noted GM vehicles as well topic shown Mazda that spec no adbv on factory filter are vertical thread end up end. My answer is accurate as posted and consistent with information posted this subforum over many years. Been discussed here many times this sub-forum including all oil gallery info. Well aware of the function and purpose of adbv. No sure why some filters might not have them. To answer your question anti-drainback valves are a good thing. The back pressure valves are shown at 10 minutes into the video. In a Chevy LS engine oil reaches the heads before it travels down to the main bearings, so there is always plenty of oil in those galleys when you pull of the filter, and you get about a 1/2 cup of oil pouring out.Īnyway, look at the anti-drainback valve in position of this video and imagine how the oil pushes the orange valve open to get buy but then when the engine is stopped, the orange valve is pushed shut against the body of the filter and cannot get by. There are some variations in the design of the galleys. When you start the engine next time, there is already existing oil all the way up to highest point in the engine. With an anti-drainback valve in postion, that hydrostatic head pushes on the rubber of the drainback valve and seals it against the filter. With no anti-drain back valve the oil would proceed in the reverse direction through the media and would go back to the oil pump and drain back into the sump. Note: this is the same oil that spills out of the engine when you pull a oil filter off. That oil would want to drain back towards the oil filter. When the engine is shut off, there is a hydrostatic head of oil all the way up to the valvetrain. Oil goes through the oil galleys and lubricates the critical parts. Some people don't realize the flow is into the outside of the filter first, then travels through the media to the inside of the filter. It pushes past the anti-drain back valve, enters into the outside chamber of the oil filter, then travels through the media, and then up into the engine. Oil flows from the oil pump, into the annulus of the oil filter, (the outside part). He cut the end cap off but left the orange anti-drain back valve in position. To understand how the anti-drainback valve works in the first place take a look at this video of a guy cutting some STP filters apart. ![]()
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