Carl Fausett

That's my bet. Canton wants the clamps over the tops of the threads. Makes this occurrence nearly impossible.

OBehave

By the witness marks on the can the clamps appeared to be properly installed.
The pressure relief valve is in the end plate that blew off and obviously was not sized right or failed to release.
Good reading in article that Rob Edwards linked to, Thanks Rob, and seems this has happened before as well as a thread I saw in Corvette forum raised the same issues.

Petza914

The brighter silver at the end of the canister in Ed's photo makes it look like that is where the clamp was located. Maybe it wasn't tight enough.

Canton Racing

We have seen this only a handful of times in the last 4 or 5 years. Usually there are a few things that need to happen for this failure. The first as mentioned is the clamps in the wrong spot, the second is the pressure relief has been removed or has become clogged and not functional for some reason, the third is that the unit had become hydraulically locked (typically happens after 5 years of use, the O-rings are worn out and the unit can't keep oil out of the air side) and the fourth is that the car was sitting in a place that got warm enough to expand the oil.

The promising thing is that we have never seen this happen while driving. It has always been after the car was parked.

From the pictures is doesn't look like the clamp was installed on the very end where the threads are. This could be an issue but will most likely be accompanied by the other issues.

If you want to give us a call and ask for Bob we can talk and probably pinpoint the issue. The Accusump is a great product and these threads usually draw out the skeptics and the haters to take cheap shots so we try to be active, upfront and completely honest on any of these issues.

OBehave

The reason for this post was NOT to complain about the product,company or performance of either, I just want to clarify that,and I apologize if it came off that way. It was a notification to users of said product or ones similar to it, that no matter how good something is,there is always a possibility that it can fail and to be safe, they were not to install it in the passenger compartment. I am a believer in this product as I have a newer unit installed in my other track car. To be fair this one in this car could very well be 10 years old or more. It came with the car and I guess I should have had it checked before using as any pressure vessels can become stressed after many cycles.
Based on Canton's post I believe it was a combination of pressure valve clogged or stuck and as I said the car was in an enclosed trailer all season long so heat could very well be the culprit for the excess pressure build.
Ed

Canton Racing

No worries, we just like to be as accessible as possible to answer any questions and concerns. We have just seen somewhat harmless posts become Canton (Or any company really) bash threads based on some minor issues (We don't consider this a minor issue). All the people that feel slighted come out of the woodworks to chime in on these threads and unfortunately most of the time the issues they are angry about were resolvable or not necessarily manufacturer defects.

We are not a perfect company by any means but we do try to rectify any issues that we are aware of. While that Accusump could be 10 years old, we still don't ever want or even expect the end caps to blow off. The pressure relief valve was added years ago in an effort to make the units safer so stuff like this didn't happen.

We also like to be aware of any issues so we can get a good idea of if something is becoming an issue so we can get ahead of it. The Accusump is a staple product for us as it is universal. However, universal products also mean we have to be well versed in many different makes and models. Porsches have presented a unique challenge to the Accusump as they typically run higher pressures which stress the components in the system out. We have actually made changes to parts of the system based on the fact that we sell a good number to Porsche owners and the higher pressures demand different parts.

If there is anything we can do to help the situation please let us know. We are always looking to help

Carl Fausett

An excellent response. +1 to Canton.

GregBBRD

That's a very strange paragraph to read and understand, having spent my entire life around internal combustion engines.

5 bar of oil pressure doesn't seem very extreme, especially for a race engine....or any engine that would need an Accusump.

My big block Fords and Chevy engines all make way more pressure than that.....

To help us all understand what we need to do, what specific changes need to be made to the Porsche systems that "demand different parts" because of their "higher pressures"?

Please understand that I'm not "bashing" your product". I'm a huge fan and have used many Accusumps, over the years. I just don't understand that paragraph.