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Re: Running XG3593A (Accord) oil filter in Fit [Re: ZeeOSix] #4975881 01/11/19 10:34 AM
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Farnsworth Offline
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Originally Posted by ZeeOSix
Originally Posted by Farnsworth
The smaller orifice requires more psid for the same flow rate than the large. Psid changes to maintain flow. Psid therefore is not the same for different size valves. Flow is the constant.


The PSID across the oil filter will be determined by the restriction of the media, the oil viscosity and the flow rate going through the media. The PSID you get across the filter and bypass valve is the same, and is based on those factors. Higher flow means higher PSID if other factors are held constant. Higher PSID with no change in flow or viscosity means more restriction. The PSID that the bypass valve sees will be the same on the bypass valve area, regardless of what size the valve is.

At what PSID the valve opens, and how far the valve opens with a given PSID is determined by the valve spring pre-load, spring stiffness (the spring constant) and the valve area that the PSID acts upon. The oil volume amount that flows through the bypass valve depends on how far it opens with a given PSID (covered by factors above), and how much exposed flow area there is when the valve moves the distance it does with the given PSID that exists across the filter.


Of course the psi on the valves is the same if psid is the same. The last factor is the total flow rate, not just through the media rate as you state. Say the valves are fully open, you mean to tell the larger opening flows the same as the smaller? The larger valve will relieve more pressure and thus the psid is lower in that filter than the filter with a smaller valve. A larger bypass will result in lower psid across it's whole range, and above it's range. Once the two valves start to open the psid on the systems start to diverge. A large valve may flow at 10 psid where a small needs 11 to equal the flow or something of that nature.

Re: Running XG3593A (Accord) oil filter in Fit [Re: Farnsworth] #4976173 01/11/19 02:56 PM
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ZeeOSix Offline
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Originally Posted by Farnsworth
Originally Posted by ZeeOSix
Originally Posted by Farnsworth
The smaller orifice requires more psid for the same flow rate than the large. Psid changes to maintain flow. Psid therefore is not the same for different size valves. Flow is the constant.

The PSID across the oil filter will be determined by the restriction of the media, the oil viscosity and the flow rate going through the media. The PSID you get across the filter and bypass valve is the same, and is based on those factors. Higher flow means higher PSID if other factors are held constant. Higher PSID with no change in flow or viscosity means more restriction. The PSID that the bypass valve sees will be the same on the bypass valve area, regardless of what size the valve is.

At what PSID the valve opens, and how far the valve opens with a given PSID is determined by the valve spring pre-load, spring stiffness (the spring constant) and the valve area that the PSID acts upon. The oil volume amount that flows through the bypass valve depends on how far it opens with a given PSID (covered by factors above), and how much exposed flow area there is when the valve moves the distance it does with the given PSID that exists across the filter.

Of course the psi on the valves is the same if psid is the same. The last factor is the total flow rate, not just through the media rate as you state. Say the valves are fully open, you mean to tell the larger opening flows the same as the smaller? The larger valve will relieve more pressure and thus the psid is lower in that filter than the filter with a smaller valve. A larger bypass will result in lower psid across it's whole range, and above it's range. Once the two valves start to open the psid on the systems start to diverge. A large valve may flow at 10 psid where a small needs 11 to equal the flow or something of that nature.

I never said a larger opening flows the same as a smaller one. The flow through the bypass valve is dependent on its area and how far the valve opens as a function of PSID (ie, the spring pre-load and stiffness). A smaller sized valve could flow just as much or even more than a larger valve depending how the springs are matched up to the valve size. Spring pre-load and spring constant is what will determine initial opening pressure and how far the valve moves with increasing PSID across it. You can't make any real general conclusions on how a bypass valve is going to flow by just looking at it. They would have to be mathematically modeled, or ran through an actual PSID test procedure to verify opening pressure and flow through the valve as a function of PSID across it.

Bottom line is if 10 differently sized relief valves were all correctly designed to open at 12 PSI, then they will all start to bypass at 12 PSI. But as the PSID continues to go up, some valves may not open as far due to spring stiffness. So depending on the combination of the linear movement vs PSID curve and the size of the valve, it's entirely possible that a smaller sized valve can open farther and flow the same or more with the same increase in PSID than a larger valve having a much stiffer spring.

Anyway, I need to get off this and get ready to watch some of those old 70s shows ... "goodtimes" re-runs are always fun to watch. wink

Re: Running XG3593A (Accord) oil filter in Fit [Re: M1Accord] #4976674 01/12/19 03:20 AM
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WellOiled Offline
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ZeeOSix - +1 on the bypass valve explanation.

Déjà vu on “goodtimes”.

+2 for the whole post. grin2


Mazda 6
Factory fill
Re: Running XG3593A (Accord) oil filter in Fit [Re: M1Accord] #4976838 01/12/19 10:12 AM
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Farnsworth Offline
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I don't even have a car that uses a bypass valve in the filter. It's interesting situation when someone is friendly and has an idea and no one can read what they say because their own ideas and ego block logic. It was a discussion about bypass flow, not "who is right." It may explain why sometime cars have mysterious start up noises. Small bypass may spike psid. cheers

Re: Running XG3593A (Accord) oil filter in Fit [Re: Farnsworth] #4977029 01/12/19 01:40 PM
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ZeeOSix Offline
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It was all technical talk about how bypass valves work, and why someone can't just visuslly look at a bypass valve and determine if it flows well or not. No "logic blocking". And start-up noise is typically caused by a leaky ADBV causing oil galleries above the filter to empty. Even if a bypass valve opens on a cold stat-up, the engine will still get the same oil flow from the positive displacement pump, even if there is a slight PSID spike.

Re: Running XG3593A (Accord) oil filter in Fit [Re: ZeeOSix] #4977331 01/12/19 08:05 PM
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Farnsworth Offline
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Originally Posted by ZeeOSix
It was all technical talk about how bypass valves work, and why someone can't just visuslly look at a bypass valve and determine if it flows well or not. No "logic blocking". And start-up noise is typically caused by a leaky ADBV causing oil galleries above the filter to empty. Even if a bypass valve opens on a cold stat-up, the engine will still get the same oil flow from the positive displacement pump, even if there is a slight PSID spike.

I'm sorry sir, I never said anything about looking at a bypass valve and determining it's flow, although a small hole will restrict more given the spring opens enough on both large and small. I merely said a larger versus a smaller as a description, it isn't about me looking at the valves. Unless you are saying they all flow the same when open? Valves do have different capacities. The discussion isn't about me, and I am not the only one here who has gone down this rabbit hole of endless posts with you.

It's about hydraulics, as simple as knowing we can lift a whole car with finger pressure because channeling oil through different size chambers increases or decreases the pressure. Same thing for a bypass valve. I have no idea why such a big deal was made of something like this. Very unpleasant. You're welcome to have the last word, I don't really care any more, not my bag. All the best. cheers

Re: Running XG3593A (Accord) oil filter in Fit [Re: Farnsworth] #4977528 01/12/19 11:20 PM
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ZeeOSix Offline
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Technical discussions are what happens on a chat board like this one ... you know that "goodtimes". Yeah, its ptetty obvious from your comments.

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