LSJr tests oil filter BP function ... "OIL FILTERS: What most people DON'T know"

[dnewton3]

There is a video out from Lake Speed Jr regarding oil filter bypass function.
It is titled "OIL FILTERS: What most people DON'T know"

As for the context of the video itself, there's nothing new to anyone who's been around here a while, or remembers Jim Allen's BP testing (real world) in his truck.


The video has profanity and is NOT allowed on BITOG.
You may discuss the video, but do NOT link the video or it will be taken down and you'll get a warning.

 

[Patman]

I watched the video this morning and wish that there was a way they could have tested the bypass out with much colder oil. For a lot of people they are starting up their car in the winter with the oil at 0F or less. I want to know if the filter is going into bypass then.

 

[BrendanC]

was quite eye opening that dp was higher when hot.

 

[Glenda W.]

Not his finest work imo.

 

[TiGeo]

Not his finest work imo.

What was wrong with it? Really a quick and informative video for me - watched having my coffee. I had no idea how that all worked and it was easier to watch this than read 100's of posts of bickering here to get to the same info.

 

[Sayjac]

I thought vid a decent oil filter primer. Otoh, I don't agree with what "appears to be" their conclusion about bypass event frequency. I trust Jim Allen's bypass events frequency findings and conclusions far more.

 

[TiGeo]

I thought vid a decent oil filter primer. Otoh, I don't agree with what "appears to be" their conclusion about bypass event frequency. I trust Jim Allen's bypass events frequency findings and conclusions far more.

Who is Jim Allen? Videos? Posts here?

 

[Glenda W.]

What was wrong with it? Really a quick and informative video for me - watched having my coffee. I had no idea how that all worked and it was easier to watch this than read 100's of posts of bickering here to get to the same info.

I agree the info was good for those who don’t know. Honestly maybe it’s just me but Lakes friends use of some terms seemed off. “plastic check valve” and I can’t remember what he called the bypass but I wasn’t familiar.

 

[TiGeo]

I watched the video this morning and wish that there was a way they could have tested the bypass out with much colder oil. For a lot of people they are starting up their car in the winter with the oil at 0F or less. I want to know if the filter is going into bypass then.

Shouldn't matter right? It's the difference in in/out pressure that trips it vs. out and out viscosity?

 

[Halderm]

Interesting video but yes I agree with most id like to see super cold oil 0 F or colder. And maybe run a filter for 5,000-10,000 miles or something and see what conditions make it go into bypass.

 

[TiGeo]

Or he could test one that folks think have a leaky by-pass valve vs. one that they think doesn't based on cut open/flashlight testing I see here/on other videos to see if pressure data support a leaking valve. I think he should partner up with PF on this one.

 

[4wheeldog]

Nothing really new here. But good information. I did miss whatever profanity might have been in the video. Or I have just become calloused to it.

 

[KGMtech]

I watched video and also wondered about -29C oil flow. We all know that synthetic is better but does this -29C mean there is 5 seconds of no filtering going on? Us BITOG scientists want to know. I would also want to have such a test use oil with some usage time on it, not fresh from the bottle with a new filter.

 

[ARCOgraphite]

was quite eye opening that dp was higher when hot.

Old Arco at it again!

I have mentioned that possibility, such as rev matching for down shift at high rpm. In such case the oil temp is high and the mains drill ( galleries) and bearing effective restriction or "impedance to flow" will be much less than with ambient temp fluid. So, with that half of the equation being < the delta to the inlet side could possibly be higher in a certain operating circumstance. A chart recorder on a reporting DP gage would be required to verify this hypothesis.

When considering cold starts,
Think of the mall store doors opening for a black Friday sale - and hungry buyers as oil molecules. The mall door portal is the media porosity here.
When the doors first open the DP will be highest with massive crowding outside the door but free flowing once inside. But after a short minute there will now be a shoulder-to-shoulder crowd on both sides of the door portal, as the aisles fill and here the traffic (flow) inside is now highly restricted. At this stage of the event the differential between inside and outside is at stasis.

With cold, viscous oil the outlet impedance will be high (lower flow) soon after the cold viscous fluid is pumped into and fills the mains drills and bearings and this will result in a lower delta. Just at initial start, if the filter or oil galleries are dry will there occur a DP spike - and likely the poppet relief opening.

Just remember and know that once the crank and rod big ends are spun up and floated, the bearing clearance is effectively halved; approx. one thousandth of an inch is not much of a gap especially with the small 5/32" journal feed hole. When you plastigage check a clearance, the crank is sitting on one half the bearing insert. It better not do that in operation.

Just some thoughts, all to be verified with gauges and charting in situ (operating engine and vehicle).

I'll have to watch the LSjr video tonight. I've got some snow shoveling to do this morning. I am surprised to hear that there is profanity in his video

 

[bullwinkle]

Lost another post for no reason-I didn’t link to it! Anyway, as I said in my deleted post, member @Jim Allen performed a series of tests, some with cold oil on a cold start, that showed that bypass events generally only happen cold, with above idle RPMs, or redline, when the bearings are capable of pulling oil out of the galleries and the dP increases across the filter enough to crack the bypass open. Jim hasn’t posted since 2023, so maybe he’s no longer with us?

 

[bullwinkle]

Who is Jim Allen? Videos? Posts here?

Not since ‘23, but he did a bunch of bypass testing.

 

[TiGeo]

Not since ‘23, but he did a bunch of bypass testing.

Links in this post:

Post in thread 'How often are filters in bypass mode?'

Apr 27, 2024

Let's put the bench racing theory aside and look at some real data!

A long-time member here (Jim Allen) did some actual filter BP event testing. It was more than a decade ago. He ran 10w-30 lube and a normal FF filter on his 5.4L F150. He used some fairly accurate equipment in a special filter base mounted to the engine, IIRC. He was able to measure the actual dP across the filter.

(note ... these threads are from the old platform, so some of the quotes are hard to discern and take a bit of deductive reading)
Here are a few of his dP threads...

• dnewton3

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[AZjeff]

I had to download the transcript and run it through a profanity filter to find that the "D word" was used one time....

Line in the sand. If you wouldn't hear it in church don't use it here.

Good info clearly presented even though LSJ is a bit hard to listen to. Question: does the bypass built into some blocks ever go bad?

 

[4WD]

watched it - usually a nugget or two in his video’s … Not much here.

 

[Patman]

I would also have liked to see cold weather testing. I don't know where this dyno facility is located, but most of the country is in the middle of cold weather. I wonder if they could leave an exterior door to the dyno chamber open overnight, and then rerun this test early in the morning?

Or put the oil in the freezer overnight