STP/ecore - no bypass?

[Stelth]

I recently cut open two STP filters, an S8A and an S3614. Here's a pic of the S3614:

I looked this filter application up on the Purolator and Fram site, and they both give a PSID for a bypass valve. The Autozone website says that this filter has a bypass valve. I sure can't see one.

The S8A, which cross-references to the PH8A or FL1A that I cut open also didn't have a bypass valve. I believe both of these applications require one.

What gives?

 

[river_rat]

If that has two rings of holes on the baseplate for a filter that is supposed to have a bypass, then you're looking at the bypass right there. The black ADBV in the picture temporarily pushes out of the way to connect the sets of holes and let oil bypass around the element across the baseplate.

It's hard to see the inner set of holes because there is a sheetmetal plate with only one set of holes over the base.

(Picture at champlabs.com, products tab, oil filters...they make them.)

 

[Stelth]

Originally Posted By: river_rat
If that has two rings of holes on the baseplate for a filter that is supposed to have a bypass, then you're looking at the bypass right there. The black ADBV in the picture temporarily pushes out of the way to connect the sets of holes and let oil bypass around the element across the baseplate.

It's hard to see the inner set of holes because there is a sheetmetal plate with only one set of holes over the base.

(Picture at champlabs.com, products tab, oil filters...they make them.)


Ah, OK. Yeah, the baseplate has two sets of holes. I wonder how well that works out when the ADBV gets hard like the one in this filter.

 

[Silver02ex]

Filter looks great, like other E-core I have used and posted on here.

 

[river_rat]

Originally Posted By: Stelth
...I wonder how well that works out when the ADBV gets hard like the one in this filter.

Or really cold out. I would switch filter brands, if in doubt. (I usually use Wix or NAPA Gold.)
Although all filters are supposed to be tested to work. We have also seen some E-cores blow a chunk of filter paper through the inner tube, and presumably into the engine...Who knows the cause?

Supertech (most), STP, Valuecraft, AC/Delco (most) and few others use this "E-core" design, as it's called. Champion Labs makes some great oil filters in my opinion like the K&N and Mobil 1 EP, but I do not care for these E-cores.

 

[daman]

You opened up that filter from the wrong end?

 

[Stelth]

Originally Posted By: daman
You opened up that filter from the wrong end?

Yeah. Well, I clamped it in a pipe vise, and if I clamped it from the top end, it would crush the filter.

river_rat, I don't trust this combination ADBV/bypass valve idea. I assume that the bypass function depends on a certain level of pliability from the ADBV, and this thing is pretty stiff. I think I'll stick with Purolator for now. Or, if I'm feeling flush, Bosch.

 

[daman]

Right stick with a Puro,WIX,NG

 

[river_rat]

I agree Stelth, I like a metal spring that opens at all temperatures the same way, and doesn't harden up.