Originally Posted by Primus
Originally Posted by ZeeOSix
Originally Posted by Triple_Se7en
Noisy-Slow (better phrase) on cold startup Zee..... that was the #1 problem I had with Ultras. High efficiency filters effects many GMs. Affects our standing idle in gear - even their MPGs.
Manufacturers know this! That's why Hyundai puts this-type filter into action - why GM promotes the more flowing Ecore in many applications.
So when members here hail Ultra as the best - or they claim 99%@20 is king,..... well the best restriction is not always best for the engine.
Ultras are not restrictive, they flow as good or better than any oil filter out there. If you have a noisy start-up then it's possible the ADBV is leaking some - any filter can do that.
It's very hard to buy into that an oil filter is going to effect the engine's idle or gas mileage ... they just aren't that restrictive. Like I said, oil filters are only about 1/15 th as restrictive as the engine's oiling system. So hw can something that is that small of a flow restriction cause engines to not idle right or change the fuel mileage ... I can't see it actually happening.
Read this thread from where the link pops into it -
LINK
I don't have a base to distrust owners personal experience with this or that filter. They hear a noise with one, but don't hear it with another. If they hear a noise on cold startups, this is a weak-up call. I have also read claims that M1 filters being too restrictive had destroyed a couple of Preludes' engines during events. At the same time I still cannot catch how a proper functioning filter may be restrictive, especially at idle. And what's about a by-pass valve ? Think there should be enough oil to circulate - quality of this oil is another story. As for a leaking ADBV, yes, this may happen, but if this is a cause then they should hear a noise right after a new filter is installed. Again, it's filled in with oil quite quickly and think an empty filter should not be a real cause of noise. Could not be the cause of noise certain combination of release valve setting on engine and filter's performance ?
As for data in the link, is it possible to extrapolate somehow DP with Ultra to values as per ISO 4548-1 ? Typical EU spec shows DP at nominal flow with 24 cSt oil viscosity. If I am not mistaken, ISO 4548-1 also foresees tests with 500 cSt oil viscosity, but to my regret I have never seen these results. Here are values for new filters:
Filter 1: DP = 7.3 PSI @ 6.6 GPM
Filter 2: DP < 14.2 PSI @ 8.0 GPM
Filter 3: DP < 4.4 PSI @ 4.5 GPM
Thank you in advance.
Some engines are just more sensitive to ADBV leak down - and some engines may have hydraulic lifters that leak down some if the ADBV leaks and lets oil galleries drain down
Every vehicle I've ever changed oil on. I let it drain anywhere from 2 hours to over night. And even with a bone dry new oil filter installed, the engines I've owned never make one abnormal noise on first start-up after and oil change.
And as you mentioned, the filter bypass valve would open if the media was totally restrictiveness or clogged, and the engine would still get good oil supply with a good PD oil pump, especially at idle. Pretty much anyone who complains of start-up noise has an engine that is very sensitive to the ADBV leaking which causes some of the oil galleries above the filter to drain down.
Just very hard to buy in to someone saying an engine runs like crap and gets way worse gas mileage with certain oil filters installed. Especially knowing how restrictive a typical oil filter is compared to the actual flow restriction of an engine's oiling system. The oil filter is way less restrictive than the engine.