Does anyone know if Fram still uses a mesh screen over the bypass valve of their Toughguard filters like they used to? Not sure what the real purpose of that would have been though. Started using the Toughguard on my Altima instead of the Ultra. I get much less start up noise with the Toughguard versus the Ultra. Don't understand that either. Any thoughts?
Fram Toughguard oil filters
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Originally Posted By: gregk24
No mesh screen anymore. Maybe because the ADBV has a better seal against the fiber end cap vs. the metal one on the Ultra.
Huh? The mesh screen over bypass, long touted by Fram as superior feature of the TG in relation to the orange can, would have no relationship to the silicone adbv used on the TG. The screen over bypass as was advertised, was to keep larger particles not caught in the media from returning to the engine in a bypass event. There would also be no relationship to the screen whether the endcap was of fiber or metal construction.
It was quietly removed some time back, I speculate to reduce construction costs more than anything else.
To the topic, other than a malfunctioning Ultra adbv as Zee mentioned, no reason I can think of why use of the Ultra should result more start up noise, and the TG less.
No mesh screen anymore. Maybe because the ADBV has a better seal against the fiber end cap vs. the metal one on the Ultra.
Huh? The mesh screen over bypass, long touted by Fram as superior feature of the TG in relation to the orange can, would have no relationship to the silicone adbv used on the TG. The screen over bypass as was advertised, was to keep larger particles not caught in the media from returning to the engine in a bypass event. There would also be no relationship to the screen whether the endcap was of fiber or metal construction.
It was quietly removed some time back, I speculate to reduce construction costs more than anything else.
To the topic, other than a malfunctioning Ultra adbv as Zee mentioned, no reason I can think of why use of the Ultra should result more start up noise, and the TG less.
If the screen became clogged with debris or sludge, the filter would no go into bypass when needed.
Originally Posted By: salv
If the screen became clogged with debris or sludge, the filter would no go into bypass when needed.
That's possible on an engine that's a big sludge machine. I don't know why Fram really put it there in the first place - I can't imagine chunks that big unless the filter media is already over loaded and chunks start breaking off and going down the bypass valve when it opened. I think it's the only filter I've seen with a screen over the bypass valve.
If the screen became clogged with debris or sludge, the filter would no go into bypass when needed.
That's possible on an engine that's a big sludge machine. I don't know why Fram really put it there in the first place - I can't imagine chunks that big unless the filter media is already over loaded and chunks start breaking off and going down the bypass valve when it opened. I think it's the only filter I've seen with a screen over the bypass valve.
Originally Posted By: salv
If the screen became clogged with debris or sludge, the filter would no go into bypass when needed.
That is a really great observation-- Salv--never thought about that---a piece of torn off media could close it right off
If the screen became clogged with debris or sludge, the filter would no go into bypass when needed.
That is a really great observation-- Salv--never thought about that---a piece of torn off media could close it right off
I've had the same experience. Start up problems with the fancy Fram (and nearly everything else) but the Tough Guard is a champ for me at start up. Cheaper too, it's one of my favorite filters as a result.
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Quote:
If the screen became clogged with debris or sludge, the filter would no go into bypass when needed.
That is a really great observation--never thought about that---a piece of torn off media could close it right off
A piece of media torn of a Tough Guard, then completely covering the screen? Now that would be a TG media failure.
Whether for cost savings or because of the unlikely possibility of the covering of the screen or both, the TG's screen over bypass in no longer used.
'If' it is because of the latter, would that put TG's screen over bypass in the same category as Fram Double Guard media?
Quote:
If the screen became clogged with debris or sludge, the filter would no go into bypass when needed.
That is a really great observation--never thought about that---a piece of torn off media could close it right off
A piece of media torn of a Tough Guard, then completely covering the screen? Now that would be a TG media failure.
Whether for cost savings or because of the unlikely possibility of the covering of the screen or both, the TG's screen over bypass in no longer used.
'If' it is because of the latter, would that put TG's screen over bypass in the same category as Fram Double Guard media?
Upon further thought, if TG media tore off, in all probability the TG would be in bypass anyway so covering the screen would make no difference. And would be preferable to returning to the engine.
All that said, a very unlikely event imo.
All that said, a very unlikely event imo.
^^^ If the media tore or even broke away (highly unlikely like sayjac mentioned), the media would most likely just stay put due to the oil flow through the media always trying to push it through the center core. The filter would have to basically go into 100% bypass (ie, no flow at all through the media & center core) for any loose material/debris to go down the bypass valve.
Only exception might be applications where the filter is mounted vertically (45 to 90 degrees from horizontal) with dome end down. If any loose material or debris were to slough off and fall down into the base near the bypass valve, then it's possible it could get swept through the bypass valve on cold start-up if there's bypass event. My guess is that is why Fram had the "screen over the bypass valve" design.
Only exception might be applications where the filter is mounted vertically (45 to 90 degrees from horizontal) with dome end down. If any loose material or debris were to slough off and fall down into the base near the bypass valve, then it's possible it could get swept through the bypass valve on cold start-up if there's bypass event. My guess is that is why Fram had the "screen over the bypass valve" design.
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