The proper oil filter for the Vanagon WB and most vehicles has an anti-drain back valve. It is basically a diaphragm under the oil inlet which is that series of holes on top of the filter. The air cooled Vanagon filter does not get one. Most vehicle engines also get the bypass valve. This is used if the filter gets clogged and/or to allow that inrush after strt up if the oil is too viscous to go through the media, (filtering material). The VW in line engines and the air cooled have the bypass valve in the oil filter adapter. The Water Boxer does not and that is why it uses a different filter number if using a Mann or Mahle filter. Most of the remaining aftermarket says that an extra bypass valve is not an issue so the infamous Fram PH2870A is used for both. If you cross reference other brands, you will also find the PH3600 is usable. As for the choice of filter affecting lifter clatter or oil pressure problems, this is the Hokum. While I agree that the Mann and Mahle filter is a higher quality, maybe better designed part, if the difference of a 1-2 psi pressure drop makes a difference, the engine is in trouble anyway. As for the drain back valve holding the oil in the lifters, one does not know how they work. Shutting down a warm engine, there is no residua l oil pressure anywhere except inside the lifters, and any under an open valve will bleed down eventually. As for the design and wall thickness of the can, the older water cooled engines that operated at 90 psi warm and a lot colder, needed good filters. Our engines that barley muster up 75 cold and less than 50 warm do not know the difference. I remember blowing up many a Purolator on a 76 Scirrocco. Dennis -----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Tabe Johnson Sent: Wednesday, August 30, 2006 12:35 AM To: vanagon@GERRY.VANAGON.COM Subject: Re: Re-useable oil filter Mike/List, This is a load of hokum that has been going 'round the list for a while. The only valve in any oil filter is a bypass valve which would activate itself if the filter media got too clogged to pass enough oil, for instance. Let's see: How would a valve that kept the lifters from bleeding down work? It would apply oil pressure. Where does oil pressure come from? The oil pump. When the engine's off, the pump's off. So when the engine's off, there's no oil pressure, regardless of how many valves you have in your filter. tabe johnson/87 westy PS - speaking of hokum, (and I'm not trying to be aggressive - just asking the question) how is it that replacing just one of the two pneumatic rear hatch struts can cause it to fail prematurely? One strut doesn't know what the other is doing. It's just applying pressure to a piston, right?
*** cut here *** Date: Tue, 29 Aug 2006 21:58:33 -0400 From: Mike Collum <collum@VERIZON.NET> Subject: Re: Re-useable oil filter But what about the valve in the filter that keeps the lifters from leaking down? Mike |
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