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AC Delco oil filter bypass pressure #4543452
10/14/17 05:42 PM
10/14/17 05:42 PM
Joined: Nov 2008
Posts: 11
TexHawk Offline OP
TexHawk  Offline OP
Joined: Nov 2008
Posts: 11
Does anyone know where specs are for the bypass valve opening pressures for various oil filters?
Especially, AC Delco PF64?

I have seen some information that the PF64 bypass pressure has been increased to 22 PSI, while the WIX equivalent (57060) still has a bypass pressure of 12 PSI. The increase in pressure is supposed to be because GM engines now have a variable volume oil pump and the higher pressure is to keep more unfiltered oil from being dumped in the engine...

Re: AC Delco oil filter bypass pressure [Re: TexHawk] #4543817
10/15/17 07:53 AM
10/15/17 07:53 AM
Joined: Dec 2016
Posts: 7,114
Waco, TX
Linctex Online content
Linctex  Online Content
Joined: Dec 2016
Posts: 7,114
Waco, TX

"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: AC Delco oil filter bypass pressure [Re: TexHawk] #4544077
10/15/17 12:20 PM
10/15/17 12:20 PM
Joined: Jul 2010
Posts: 19,260
ZeeOSix Offline
ZeeOSix  Offline
Joined: Jul 2010
Posts: 19,260
Maybe AC Delco filters are pretty restrictive so they bumped up the bypass setting for that application. The less flow restrictive a filter is, the lower the bypass valve setting can be.

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