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Oil filter design & engineering
We all know that oil will leak past threads unless you've got some type of sealent on the threads like teflon tape, teflon paste or similar.
In a typical canister oil filter. The filter attaches to the engine, or remote filter mount with a threaded nipple, for example a 3/4" diameter x 18 threads. And we know that bigger the thread, the bigger the leak. So does it leak when under pressure? If you look at this part of the filter it is made from a stamped steel plate with perimeter holes and a female thread. And other bits & pieces like anti drain back, pressure relief, etc. When the filter canister is screwed on to the engine/remote it seales itself around the outer perimeter with the rectangular cross-section 'O'-ring rubber seal. When the filter is screwed on, a chamber is created, where pressurised oil from the engine oil pump enters the filter, is forced through the element and out through the center of the nipple back to the engine. So I was curious to know how much oil would leak past the nipple threads as we know threads leak so easily! So is it just the virtually equal pressure on both sides of the thread that make It leak free? What are your thoughts? Arthur |
Only a small percentage of oil goes through the filter on any "pass" depending on viscosity and temperature so a small leak there will make no difference!!:cool: The filter has a pressure "bypass" built into it for the purpose of letting most of the oil bypass the element......
If all the oil had to go through the filter element you wouldn't have enough flow to lubricate the engine and the pressure due to the restriction of the element would be sky high!! :eek: |
Arthur.... you're thinking too much! Coosawjack is spot on! It's more important to high quality oil filters, e.g., WIX, Canton, etc.
Mark |
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Bob |
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http://en.wikipedia.org/wiki/Oil_filter |
I think the article and I are in agreement.
Bob |
Contact www.bobstheoilguy.com and inquire but I have a hard time believing you can put 50 weight oil through any descent modern filter medium at any temperature without a bunch of it being bypassed either by the "Filter Bypass" or the oil pump "Pressure Relief Valve??:cool:
Either way most of the oil does not go through the filter in a single pass.:) At any rate you DO NOT need any thread sealant on the filter's threads!! :MECOOL: |
I'm running 5W-30 Redline and I think most, if not all, of it is getting filtered (through a Moroso 27 micron racing filter) each time through.
And I agree no thread sealant is necessary. Bob |
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Be careful about choosing "racing filters" for a driver. The larger micron, 23 & up (Moroso 27) are for racing applications, where you're more concerned about high flow rate. Most race engine are torn down often compared to street cars, so they don't care as much about fine filtering the oil. The small microns are for street drivers and do a better job of filtering. |
Great replies, thanks. When I built my engine I followed the advice in a book about building a performance engine. One of the tips was to install a dual remote filter system and to remove the engine stock bipass/pressure relief valve. So now I need to make sure that the cannister filters I use have a relief/bipass built in.
Arthur |
the motorcraft fl-1hp has a higher setting on the bypass 18 psig instead of 11 psig so it forces more oil through the filter
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What's the intended purpose of your car ?
What type of canister filter do you have, normal or a true canister like this one ? http://i509.photobucket.com/albums/s...S/getimage.jpg |
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Mark |
I find this great as I also have the Canton products to use with my new motor. I'll get back to you later, as I'm leaving to race our sprint car tonight. I may have some questions.
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The cannister filters are just the typical disposable filters that production cars use. I will always try to use the best quality of these. Arthur |
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Z. |
More than you will ever need to know here!!:D
http://www.google.com/cse?cx=0182999...ubbthreads.php I still believe the "full flow" filter bypasses a lot of oil through the internal bypass valve!!!:rolleyes: |
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Mark |
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