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  #1  
Old 19th July 2019
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Exclamation Oil Filter

63796-77A, This is the HD # for the 30 micron oil filter that is used for my Sportster. There is a part # change update, 63731-99A and this is a 5 Micron filter. Seems to me that a 5 Micron filter is going to pass more unfiltered oil, until it reaches operating temps PLUS slow the oil return in general. I'll stick with the 63796-77A filter, don't want to sieze a crankpin or something because of lack of oil! Oil filters are just as important as the oil you choose.
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Old 19th July 2019
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People still don't understand the bypass valve !!!!
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Old 19th July 2019
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9+ gallons a minute isn't going to starve the motor for oil. Isnt the new HD premium used for the Sporty and BT 5 micron?
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Old 20th July 2019
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Quote:
Originally Posted by 60Gunner View Post
9+ gallons a minute isn't going to starve the motor for oil. Isnt the new HD premium used for the Sporty and BT 5 micron?
It certainly is !
I run the Napa 7148
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Old 20th July 2019
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Quote:
Originally Posted by rocketmangb View Post
People still don't understand the bypass valve !!!!
I understand how a by-pass valve works, maybe I should have said "Unfiltered oil", but by-pass valves, all seem to have different pressures to open them. So, if you use say an AC Delco oil filter, it takes 11-16lbs of pressure to open it, where a Harley specific filter's by-pass valve only takes 4-7lbs of pressure to open. Too much by-pass pressure, I think, leads to wet sumping or overflowing oil tanks and lack of oil getting to where it needs to be. If I'm wrong point me in the right direction....please.
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Pressure "Differential" is 8 PSI not pressure !
IE" 30 PSI inside and 25 PSI outside the valve is closed
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So it's pressure DIFFERENCE not actual pressure.....Thanks Rocketman!
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Quote:
Originally Posted by Toejam503 View Post
I understand how a by-pass valve works, maybe I should have said "Unfiltered oil", but by-pass valves, all seem to have different pressures to open them. So, if you use say an AC Delco oil filter, it takes 11-16lbs of pressure to open it, where a Harley specific filter's by-pass valve only takes 4-7lbs of pressure to open.
You are correct about the bypass opening if the filter is restricted. I'm not sure how one can tell if it's too restrictive or not, any ideas?

Quote:
Originally Posted by Toejam503 View Post
Too much by-pass pressure, I think, leads to wet sumping or overflowing oil tanks and lack of oil getting to where it needs to be. If I'm wrong point me in the right direction....please.
The oil pump will move x-amount of volume per RPM, no matter where it goes, it WILL move at a fixed volume flow rate - no more, no less. If the fluid doesn't have a place to go then the pump will catastrophically fail (blow up). The only way the pump would move LESS oil is if it doesn't have any coming in, and air comes instead.
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...So your concerns about more bypassing, with a "tighter" filter, may be valid. (Due to the fact that the oil pump will still move the oil volume, wherever it goes). Someone with knowledge of oil & micron ratings should look into that.

I'm not one to blindly trust other's engineering either, but I do think it's safe to assume that HD has thoroughly studied myriad options for oil filters and engine longevity over the years. I'm just going to keep using the same NAPA (Wix) filters that I always have, because that's been working fine for me and everyone I know.
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Napa Vs HD Super Premium 5

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