Only thing I DONT like about Purolators

[Panzerman]

I recently disected a couple oil filters. I post one of the Chinese filters that I am going to start using because it impressed me as the best out of three, a Champ E-core, Purolator classic and the Royal(Chinese). The Purolator came off my Dodge Hemi and I think that the Bypass is awful on the Purolator, it has this little Flash Gordon type spring washer, held on with a rivit, its held on good, I couldnt pry it off, I also could not get it to open. It was super tight, where other bypass valves, I could push open, this thing I couldnt get to open but just a tiny bit pushing on it with a screw driver. I am planning on cutting open a another one, new one this time and check it out maybe I had a defective one. I got a case of these Purolator classics to use up, but I dont care for that by-pass valve. I dont run long oil changes, but that filter would never let it suck enough oil in bypass.

 

[Dave Hess]

All the ones I have cut open seem just fine.

 

[labman]

Unfortunately I have destroyed the dome end bypasses by drilling a hole in the filter to let the oil out after I have removed them. I do have enough left of the last Purolator to see the the spring loaded plate is no more than 0.25 sqin. With say 10 psid, the plate would have about 2.5 pounds force on it. You shouldn't have had to press very hard. It may not be designed to open very far.

I really like thread end bypasses.

 

[bepperb]

I'd agree the bypass isn't the best on them. That's the tradeoff, you get a worse bypass design and more media than a WIX. To each his own what's important, personally I doubt my engines spend any time in bypass outside the coldest days of winter.

It would also be worth noting, assuming the same media more media area would result in a smaller PSID and less opportunity to require bypass.

 

[mechanicx]

While the bypass does seem hard to open, I'm going to assume Purolator designed it to open at the specified psid. I think the bypass being all metal construction is durable and seals well which is important. Most of my personal cars are GM so the filter doesn't have a bypass and it's a non issue. I did post 2 P1 filters that have the bypass and there was no signs that media was stressed.