Re: [DML] Specifications on Purflux LS 410C

["Joseph Kuchan" <josephkuchan@xxxxxxxxxxx>]

Bypass valves only open if the filter clogs. They insure at least some oil 
flow. But think about it. If the oil filter is clogged, the oil it is 
bypassing is probably so full of dirt and abrasives that maintenance must 
have been badly neglected.

I would think, and hope, that the owner of a car such as a DeLorean would 
take better care of the car than to get anywhere close to where the bypass 
valve, which frequently is nothing more than a flap of silicon ruber over 
some holes, would open.

I think bypass valves are there for people who don't even realize that oil 
needs to be changed! People who drive their cars 15000 miles between oil 
changes are in this category.

My understanding is that the PRV itself contains a bypass valve which would 
make one in the filter a nice to have redundancy, but hardly a necessity.

As for an anti-drainback valve, the filter sits mostly horizontally so most 
of the oil probably does drain out when you turn the car off, so the first 
efforts of the oil pump on restart would be to refill the filter. If the car 
is filled with synthetic oil and driven frequently - at least daily - there 
is probably still a minimal oil film on critical parts. If it is driven very 
infrequently and/or filled with lower quality oil, there is probably some 
wear occuring. Is that important? I can't say. I would just refer to the 
longevity of the PRV when well maintained and say it probably is not a big 
issue.

-Joe Kuchan



>From: Marc Levy <malevy_nj@xxxxxxxxx>
>Reply-To: dmcnews@xxxxxxxxxxxxxxx
>To: dmcnews@xxxxxxxxxxxxxxx
>Subject: Re: [DML] Specifications on Purflux LS 410C
>Date: Tue, 8 Aug 2006 08:01:31 -0700 (PDT)
>
>Some more information..  I made some calls this
>morning.
>
>The Purflux LS 410C has NO anti-drainback valve, and
>NO bypass valve!  (Something to consider if you are
>lazy about changing your oil).  I was also told that
>if someone is willing to buy the Purflux in quantity
>(50 or more at a time), they can still be had at a
>reasonable price here.  Then I ask myself, is Purflux
>really the best choice?  and is it worth the premium
>cost?




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