PF 64 filter
Instructor
Joined: Sep 2004
Posts: 209
Likes: 54
From: Santa Fe NM
The pressure differential you see on the gauge is the difference between the exit of the oil pump and atmospheric. the bypass setting is what the valve is set to open at when the pressure differential is 15 psi (or more correctly for our cars 22 psi) across the filter.
Instructor
Joined: Sep 2020
Posts: 216
Likes: 47
From: NYC
A lot of bs gets spread around the car community. Something as cheap as an air filter would be the first thing to get recalled considering the damages if what is said is true.
If it makes you feel better. I put the PF64 on the car after I did my initial oil change about a month and a half ago. I've done three days at Virginia International Raceway with it. Does exactly what it should.
If it makes you feel better. I put the PF64 on the car after I did my initial oil change about a month and a half ago. I've done three days at Virginia International Raceway with it. Does exactly what it should.
Melting Slicks
Joined: Jun 2019
Posts: 2,034
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From: near philly
it goes right to the filter from the pump doesn't it? so won't it always be above 15 or even 22 regardless?
Instructor
Joined: Sep 2004
Posts: 209
Likes: 54
From: Santa Fe NM
Think of it this way, the oil just after the filter has to be at a higher state than atmospheric to carry it through the rest of the system.
Last edited by mnl119; Nov 10, 2020 at 03:37 PM.
Melting Slicks
Joined: Jun 2019
Posts: 2,034
Likes: 928
From: near philly
No. The pressure drop across the filter might only be a couple psi, with the pressure drop across the rest of the system being ~40 psi.
Think of it this way, the oil just after the filter has to be at a higher state than atmospheric to carry it through the rest of the system.
Think of it this way, the oil just after the filter has to be at a higher state than atmospheric to carry it through the rest of the system.
so basically the filter has to start getting packed up and restricting in order to build up to 15 psi
if it's clean it will never get near that
Racer
Joined: Aug 2019
Posts: 436
Likes: 239
From: Las Vegas
For example, if the oil pressure entering the filter is 80 psi and the pressure exiting the oil filter is 60 psi, the pressure drop across the oil filter is 20 psi and the by-pass valve in the PF64 will not open. But if you were using a filter with a 15 psi by-pass valve (PF48, RP 10-48, etc), it would open and send unfiltered oil through your engine needlessly.
Now if the pressure entering the filter is 80 psi and the pressure exiting is only 50 psi, then the PF64 by-pass would open to keep from starving the engine for oil.
However, If you use a filter with too high of a by-pass valve rating, such as a UPF64R (35 psi), and you had the same situation as above, you might starve the engine for oil since the by-pass would not open.
--KLG--
Racer
Joined: Aug 2019
Posts: 436
Likes: 239
From: Las Vegas
However, that is not the only situation. For example, operating in very cold temperatures might cause a high pressure drop across the oil filter on engine start-up, forcing the by-pass valve to open temporarily. Or using oil with too high of a viscosity, especially in cold climates might do it as well. Or starting up your cold engine and flogging it right away might also temporarily cause the by-pass valve to open.
--KLG--
Safety Car
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Safety Car
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Do not use this in your C7. It's for new smaller gasoline engines (according to GM), doesn't filter as efficiently as does the PF64, and the big kicker is the pressure relief valve operates at 35psi. GM strongly recommends an oil filter with a 22 psi pressure relief valve. PF64 is the way to go if you're under warranty.
Last edited by MMD; Nov 16, 2020 at 11:20 PM.
Racer
Joined: Aug 2019
Posts: 436
Likes: 239
From: Las Vegas
That filter fits and a lot of people use it. Dealer put one on my car at the 500 mile oil change.
However, the oil filter by-pass valve setting is 35 psi in the UPF64R. The PF64 is 22 psi.
I recall the UPF64R is used on some of GM hybrid engines, I think.
See posts #7 and #28 for GM's service bulletin regarding oil filters for the LT1/LT4.
--KLG--
However, the oil filter by-pass valve setting is 35 psi in the UPF64R. The PF64 is 22 psi.
I recall the UPF64R is used on some of GM hybrid engines, I think.
See posts #7 and #28 for GM's service bulletin regarding oil filters for the LT1/LT4.
--KLG--
Last edited by KLG; Nov 16, 2020 at 11:21 PM.
Safety Car
Joined: Mar 2018
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When my warranty runs out in a year I will make the switch over to using a NAPA Platinum if the pressure relief valve can be found to operate at 22 psi. It's probably one of the best quality oil filters you will find anywhere. Made specifically for synthetic oils. Quality filter inside using quality materials and solid engineering.
Racer
Joined: Aug 2019
Posts: 436
Likes: 239
From: Las Vegas
When my warranty runs out in a year I will make the switch over to using a NAPA Platinum if the pressure relief valve can be found to operate at 22 psi. It's probably one of the best quality oil filters you will find anywhere. Made specifically for synthetic oils. Quality filter inside using quality materials and solid engineering.
--KLG--
Safety Car
Joined: Mar 2018
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Safety Car
Joined: Mar 2018
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Regarding Fram filters, they are not considered good quality by most anyone who tests filters. K&N, NAPA, Wix, Bosch are making some of the very best automotive filters you can find today. AC Delco is acceptable.
Safety Car
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From: Somewhere nowhere