MC FL-400S Bypass Holes

[BlueOvalFitter]

In the 1st pic you will see the FL-400S has only 4 bypass holes.
In the 2nd pic you will see the FL-400S has 8 bypass holes.
When did this happen, and for what reason? Increased flow rate with 4 extra holes?
Also, why do MC oil filters have the raised bumps on the end cap?

 

[KCJeep]

Hey, that top pic is copyrighted!

Seriously I don't know about the holes, but I believe the "bumps" are how the thread end bypass is riveted into /onto the endcap.

 

[BlueOvalFitter]

Originally Posted By: KCJeep
Hey, that top pic is copyrighted!

Seriously I don't know about the holes, but I believe the "bumps" are how the thread end bypass is riveted into /onto the endcap.

Is that your pic KC? I found it on the interweb.

 

[yvon_la]

Nha it isnt for more pressure (mainly)its a coefficient of friction problem. 8 Diminishthis problem potential

 

[dlundblad]

I believe the first FL-400s I ran had the 8 holes too. I chucked the last one without cutting it open though. I have a virgin cut open Mopar with 8 holes as well.

Hmmm. If the it is the same bypass in every way, I would much rather prefer 8 over 4. I can't see that being anything, but better.

 

[KCJeep]

Originally Posted By: BlueOvalFitter
Originally Posted By: KCJeep
Hey, that top pic is copyrighted!

Seriously I don't know about the holes, but I believe the "bumps" are how the thread end bypass is riveted into /onto the endcap.

Is that your pic KC? I found it on the interweb.

Yes I posted that Motorcraft comparison here a few years back. But just kidding of course, anything you post on the web is gonna travel!

 

[AuthorEditor]

Does anyone know how that Motorcraft bypass works? What's inside it?

 

[BlueOvalFitter]

Originally Posted By: dlundblad
I believe the first FL-400s I ran had the 8 holes too. I chucked the last one without cutting it open though. I have a virgin cut open Mopar with 8 holes as well.

Hmmm. If the it is the same bypass in every way, I would much rather prefer 8 over 4. I can't see that being anything, but better.

I would have to agree.
Now, if the 4 holes were elongated, then that would most likely make up for the additional 4 holes.
"FORD-MOTORCRAFT, are you reading this? I just gave you your next oil filter upgrade."

 

[BlueOvalFitter]

Originally Posted By: KCJeep
Originally Posted By: BlueOvalFitter
Originally Posted By: KCJeep
Hey, that top pic is copyrighted!

Seriously I don't know about the holes, but I believe the "bumps" are how the thread end bypass is riveted into /onto the endcap.

Is that your pic KC? I found it on the interweb.

Yes I posted that Motorcraft comparison here a few years back. But just kidding of course, anything you post on the web is gonna travel!

Did you check your PC for my DNA?

 

[ZeeOSix]

Originally Posted By: AuthorEditor
Does anyone know how that Motorcraft bypass works? What's inside it?


Some kind of spring loaded affair from the looks of it on the outside. I've inspected a few in hand, but never cut one open to see the guts. Someone should dissect the bypass valve is they have one laying around.

 

[Nyogtha]

Mopar filters like the MO-899 show the internals in an exploded view without having to dissect one.

No idea on the raised bumps on the end cap.

 

[AuthorEditor]

Thanks for that Mopar graphic. Do you think that diagram of the MO-899 is for the currently available one, and are the ones at Walmart the same?

 

[Nyogtha]

Well I'm not sure how to answer your questions precisely. The chart is something I found on the internet, I don't know the date for that chart. It has a bit better detail than the sides of the product boxes.

I've taken pics of the oldest (2012) and newest (2015) MO-899 in my stash. The exploded views on those boxes don't show any construction changes from what I can see. However both the "long" part number and UPC codes have changed

Here's the 2012 version, purchased last year on closeout at Menard's.

Box Front (Box Back is identical) - black background with white text at the bottom. Uses the word "Authentic" and lists 5 brands.

2012 Box Text Side - 'long' part number 1-04884899AB. Bold alphanumeric sequence MF1823. Stuttgart, Germany address near the bottom.

2012 Box Exploded View Side

2012 Dome End with Date Code - April 27, 2012 Second Shift Line 7 (maybe)?

Here's the 2015 version, purchased at O'Reilly with a $5 off $5 or more coupon

2015 Box Front (& Back) - word "Genuine" used, grey background with black text at bottom, 10 brands listed

2015 Box Text Side - 'long' part number 0488 4899 AC-001. Bold alphanumeric sequence MF2B39. Torino, Italy address near the bottom.

2012 Box Exploded View Side

2015 Dome End with Date Code - April 29, 2015 Second Shift Line 7 (maybe)?

Filter cases with different 'long' part numbers

Filter box bottoms with UPC codes - black background is 2012, gray background is 2015

Filter baseplate ends - no visible difference to me

I haven't purchased any MO-899 filters at Walmart but I wouldn't expect differences other than vintage as shown here.

Why are the 'long' part numbers and UPC codes different? I have no idea. But visually, including looking down the center tubes, the construction appears identical to me.

 

[Nyogtha]

BOF,

FWIW, I looked through some BITOG threads and older threads with cut open MO-899 & MO-090 filters had 4 bypass holes, newer such threads show 8 bypass holes. Why & when? Not exactly sure.

What are the production code dates on the two MC FL-400S filters in your first post in this thread?