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Oil Filters

Posted By: 71birdJ68

Oil Filters - 11/22/14 12:53 AM

I was watching a seminar about oil filters by a retired Chrysler design engineer on the Modern Performance web site the other day, and was wondering what you all thought. He's said that the pop off valve in most filter open at around 10 lbs. pressure, and as a result around 20/ 25 percent of the oil doesn't get filtered, so, he recommends a filter like a STP that doesn't have a pop off valve. SO, what do you all think?
Posted By: BSB67

Re: Oil Filters - 11/22/14 01:33 AM

Did he state how he came to this conclusion. Did he measure it?

The by-pass pressure is the pressure across the filter element, not the oil pressure. You would need to measure the oil pressure going into the filter and the pressure coming out of the filter to determine if the pressure differential is great enough to open the bypass valve.

The purpose is to keep the filter from becoming to plugged and restricting the oil flow to the motor, and/or causing the filter to fail.
Posted By: RapidRobert

Re: Oil Filters - 11/22/14 02:50 AM

Quote:

SO, what do you all think?

I definitely would not be comfortable with ~25% of the vol not being filtered. I change oil/filter on the stock car after every nights' (1 night a week) racing but it's dirt track & needed.
Posted By: ademon

Re: Oil Filters - 11/22/14 03:01 AM

Quote:

I was watching a seminar about oil filters by a retired Chrysler design engineer on the Modern Performance web site the other day, and was wondering what you all thought. He's said that the pop off valve in most filter open at around 10 lbs. pressure, and as a result around 20/ 25 percent of the oil doesn't get filtered, so, he recommends a filter like a STP that doesn't have a pop off valve. SO, what do you all think?


Look at the inside of a STP filter, the ones I have seen have a flimsy looking plastic frame.
Posted By: hemicar1971

Re: Oil Filters - 11/22/14 03:28 AM

Quote:

Did he state how he came to this conclusion. Did he measure it?

The by-pass pressure is the pressure across the filter element, not the oil pressure. You would need to measure the oil pressure going into the filter and the pressure coming out of the filter to determine if the pressure differential is great enough to open the bypass valve.

The purpose is to keep the filter from becoming to plugged and restriction the oil flow to the motor, and/or causing the filter to fail.



I agree.

Are you talking about Ed Peters. I find he is ok but anyone that has an understanding of a oil system and pressures and volume would have a lot of questions on how he came to this conclusion. So it would all depend on how many holes are in a filter and how big these holes are. These filters might have the same pressure spring but the volume reaching the spring can change on the entry size or the orifice/ exit,so ultimately you can not come to any conclusion unless you measure the pressures on both sides of all filters. His statement in a generalize hypothesis of an Oil Filter not a real work fact. He talking like an engineer not a technician.
Posted By: Rick_Ehrenberg

Re: Oil Filters - 11/22/14 07:36 AM

I was involved in an oil filter test when ther 08 Viper engine was being proven. They found that every commercial filter on the market -- "racing" and otherwise -- bypassed to soon. They had Wix mod the valve for higher bypass opening pressure. That's now known as the Mopar SRT filter.

Rick
Posted By: BSB67

Re: Oil Filters - 11/22/14 02:26 PM

Do you know what the conditions were?
Posted By: lewtot184

Re: Oil Filters - 11/22/14 04:13 PM

i believe the balwdin 253 has a 20+lb bypass. personally, i'd be very surprised if a filter "only" bypassed 20-25%.
Posted By: Cab_Burge

Re: Oil Filters - 11/22/14 09:52 PM

Quote:

I was watching a seminar about oil filters by a retired Chrysler design engineer on the Modern Performance web site the other day, and was wondering what you all thought. He's said that the pop off valve in most filter open at around 10 lbs. pressure, and as a result around 20/ 25 percent of the oil doesn't get filtered, so, he recommends a filter like a STP that doesn't have a pop off valve. SO, what do you all think?

I've used about every brand and type oil filter out there for stock BB and SB Mopars. None of the screw on type stock replacemnt oil filters I've cut open, including STP, didn't have the bypass valve and spring in the bottom of the filters, none of them The Wix and Fram race filters bypass at a lower pressure If you don't want to use a oil filter with a internal bypass use one for a GM motor like BB and SB Chevys use I don't and wouldn't
Posted By: Pacnorthcuda

Re: Oil Filters - 11/22/14 10:09 PM

Doesnt Hastings make a "Full Flow" filter? The Amsoil people recommend it, as I recall...
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