DeTomaso Mailing List: July 97, Message #162
     



From: "D.Jones" <m203253@ws2200.mdc.com>

Subject: Interesting Oil Filter Info

Date: Wed, 09 Jul 1997 17:50:10 CDT



Hi All,



Here's a bit of info on oil filters I hadn't heard before.  This

was forwarded (with permission) from the Fordnatics list.



Later,

Dan Jones



> -> This sounds like a question for Dave Williams, but I'd guess the

> -> motorcraft filter would catch most of the debris. If fact, if some of

> -> the people on the list are correct, you're probably lucky it didn't

> -> lock up the oil pump... (might not be a bad idea to eyeball the

> -> pump's pickup tube & screen and/or oil pump)

> 

>  DING!   Time for my annual oil filter rant.

> 

>  Ford uses the same filter on almost everything.  It incorporates a

> bypass valve to prevent starving the engine with in very cold weather or

> for morons who thing 200,000 between oil changes is fine.  The bypass

> valve (usually a spring flapper) opens at a rated 5 to 7 psi.

> Supposedly a clean filter will drop pressure 3 to 5 psi.  In practice,

> the valve is cracked open most of the time, bleeding unfiltered oil into

> the oil galleries.

> 

>  The solution is to go down to your local Nissan dealer and get a filter

> for a 510 with the L-18 engine.  The filter is identical and spins

> right on, except it has no bypass valve (Nissan did it in the block) and

> is incorporates an anti-drainback valve, which helps a bit as most Ford

> filters are nearly horizontal.

> 

>  Fram and Purolator replacement filters for the Nissan used to be like

> this, but they've "rationalized" their product lines and you get the

> same crappy Ford filter for everyting now.  I haven't gone through the

> other brands to see if anyone is still making proper Nissan filters.

> 

>  I've been using the Nissan filters for years with no pressure spike

> problems in cold weather, and have plugged the internal bypass on

> several non-Ford engines, including ones with high volume pumps in -30F

> weather.



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