Oil Filter Study

jchammer · #1 (**permalink**) 04-26-2005, 02:38 PM

I recently found this article about air and oil filters. It says Motorcycle info, but applies to all filters, really.

http://motorcycleinfo.calsci.com/Filters.html

The air filter discussion is no big surprise - there's always been quite a bit of discussion on K&N's letting too much dirt through.

But the Oil filter info is interesting. The only article I'd seen before was by a guy that just took a bunch of filters apart and gave his opinions. This article is by an engineer and he goes into micron size and other stuff.

His argument suggests the Purolator Pure One is the best because it filters really small particles. However, I've heard arguments before that you don't want to go with something like this because it restricts oil flow too much. Anybody have thoughts or proof on this??

Sorry if this is a repeat thread - I searched and didn't find anything on this article.

Invid · #2 (**permalink**) 04-27-2005, 01:25 AM

bobistheoilguy.com has tons of data related to oils and oil filters. Just check their forums.

lunagr · #3 (**permalink**) 04-27-2005, 01:30 AM

Here is another study...Oil Filter Study . I found it while browsing at Bob's.

Steve

KLS · #4 (**permalink**) 04-27-2005, 11:43 PM

JC,
Most engine makers do not publish the specs for their OEM filters. The aftermarket filter companies reverse engineer the OEM filters and recommend one of their filters for this application. If their recommended filter is used, the oil filter fails and causes engine damage (unlikely), then the filter maker is liable for the cost of repairs.

Purolator Pure One filters have adequate flow rate for the engine they're spec'd for. The oil flow from the stock oil pump will not exceed the filter's flow rate. Of course, cold oil flows through filter's bypass valve of all brands of filters due to the high viscosity of the oil and subsequent resistance to flow. As soon as the oil is warm, it flows throught the media.

Ken

supritdeol · #5 (**permalink**) 04-28-2005, 12:16 AM

i buy the napa oil filter from napa autoparts, they are made by wix and they are very cheap!

BackInBlack · #6 (**permalink**) 04-28-2005, 07:16 AM

Quote:

Originally Posted by KLS

JC,
Most engine makers do not publish the specs for their OEM filters. The aftermarket filter companies reverse engineer the OEM filters and recommend one of their filters for this application. If their recommended filter is used, the oil filter fails and causes engine damage (unlikely), then the filter maker is liable for the cost of repairs.

Purolator Pure One filters have adequate flow rate for the engine they're spec'd for. The oil flow from the stock oil pump will not exceed the filter's flow rate. Of course, cold oil flows through filter's bypass valve of all brands of filters due to the high viscosity of the oil and subsequent resistance to flow. As soon as the oil is warm, it flows throught the media.

Ken

Do all filters have a bypass valve? If this is an inportant part of the filter, are some filters better than others because of their bypass valve?

Dude Boy · #7 (**permalink**) 04-30-2005, 02:29 PM

Quote:

Originally Posted by BackInBlack

Do all filters have a bypass valve? If this is an inportant part of the filter, are some filters better than others because of their bypass valve?

The material used in the bypass valve can affect how well it makes a seal. If it doesn't seal well, then some unfiltered oil will flow to the engine. It is my understanding that the bypass valve can open when the filter is clogged. I suppose if the oil was very cold and the wrong grade was being used, the bypass could open. Usually any excess pressure is relieved by one or more regulating valves built into the engine. The oil filters that I'm currently using on my Tundra don't even have a bypass valve in them. P/N 90915-YZZB5

KLS · #8 (**permalink**) 04-30-2005, 07:13 PM

There is an excess differential pressure bypass valve somewhere. In GM engines, the bypass valve is built into the filter mount, not inside the filter itself. On the Toyota 90915-YZZB5 the antidrainback flap is designed to flex away from the center tube and serve as the bypass valve.

Ken

tundra39 · #9 (**permalink**) 05-01-2005, 01:45 AM

Hey KLS,
What the heck is reverse engineering in a filter? I am really curious!
Also every engine oiling system has to have a pressure relief system or the initial start up pressure would collapse the cartridge inside the can. GM used to have a removeable plate attached to block where the filter screwed on,none in the filter itself.The other filters had a bypass valve & a anti-drainback valve.They cannot be one in the same as they perform two different functions.The oil flow through the filter itself is controlled by the micron rating & if it becomes plugged the by pass valve opens.

Bob

KLINDSEY · #10 (**permalink**) 05-01-2005, 01:56 PM

reverse engineering is buying say Toyotas filter cutting it open inspecting it and manufacturing yours from their spec's or hard work! As far as the anti drain back valve and bypass being one in the same i'll refer that oone to Ken(KLS) he has more knowledge in that area than I.
Kevin