Terry is correct, it is just an anti-drainback valve. It will keep the unfiltered oil in the filter. Some are better than others, some leak a little, some a lot, some not at all.
Most of the better filters have this valve, all of the Amsoil and Mobil-1 filters have it. I would not change your oil checking process, just fill to that same level as before. At worst case, you might get 4 oz of oil too much, which is not enough to cause any damage. -----Original Message----- From: Derek Baylor [mailto:[EMAIL PROTECTED]] Sent: Thursday, May 16, 2002 8:56 AM To: [EMAIL PROTECTED] Subject: Re: K&N oil filter Maybe it is hype, but I definately put the requisite amount of oil in my engine, and after running it with the K&N filter installed--even after 1/2 hour of sitting--much less oil was evident in the sump. Something different is going on with this filter. -Derek ----- Original Message ----- From: "Terry Thompson" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, May 16, 2002 8:24 AM Subject: Re: K&N oil filter > I believe that check valves are very common in most filters including the > stock one. If you look at the oil flow path and direction - from the sump > to the pump to the filter and then to the various engine parts like > bearings and the top end which are all under pressure, once it lubricates > the required parts it drains to the sump generally not under as much > pressure from the oil pump, the topend drains mostly by gravity and does it > all again in a loop - All the check filter will do is prevent backflow from > these points through the filter and taking junk back out of the filter into > the sump, sort of unfiltering the oil. All the oil in the topend will still > drain just fine through the oil passages to the sump just like normal > wether the engine is running or not, so there will be no problems with the > measuring the level. If it is mentioned on the filter package or in K&N > advertizing as a special feature it is merely advertising hype. Hope this > helps. > Terry > > > I just changed my oil and installed a K&N oil filter. The filter has a > check valve that prevents all the oil from draining out of your top end > after the bike is shut off. This makes terrific sense, because the oil > (theoretically) stays up in the head to prevent damage upon > start-up. Right away it seemed to be working, and herein lies the > problem: how does one check oil level at the sight glass if all the oil is > stuck up in the engine? Is anyone else on the list using these filters and > have a recommendation? With the correct amount of oil in the engine, and > after shutting down, the oil level in the sump is just a little below the > bottom of the sight glass window. Is this my new "full" mark? Can anyone > with deep engine knowledge say whether it's really an advantage (more than > theoretically) to trap all that oil up in the engine? I really just > wondering if the extra $10 for the K&N filter is worth it. > > Strange, there was no mention of this "new oil level thing" on the K&N > filter packaging. Someone with slightly lower critical thinking skills > than me (not a stretch) could easily become confused and just keep adding > oil until the level looked right. I'm guessing that on the GTS that would > be at least a quart too much oil! > > The difference between perseverance and obstinacy is, that one often comes > from a strong will, and the other from a strong won't. > -Henry Ward Beecher > > [EMAIL PROTECTED] || http://www.huntel.net/terryth The information contained in this e-mail including any attachments may constitute Corvis Corporation Proprietary Information that is subject to Non-Disclosure Agreement and cannot be disclosed to any other party without the express consent of Corvis Corporation. If you are neither the intended recipient of this e-mail nor responsible for delivering this e-mail to the intended recipient, note that any dissemination, distribution, copying, or retention of this e-mail is prohibited. If you believe you have received this e-mail in error, we request that you notify the sender by return e-mail and then delete this e-mail and any return e-mail immediately.
