[Ed Russo]

The August issue of Excellence has an article on the Canton oil filter along with photos.

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[Mark]

I guess they finally published Bob K's article.

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[ldeprat]

The problem with this product is that it lacks a reliable check valve like the stock filters have to compensate for the upright position of the 944/968 oil filter.



The only "check mechanism" is a flimsy rubber flap that deteriorates after a few miles and doesn't hold pressure well enough to keep oil in the filter at start up, which is when protection against friction in the engine is needed most.



I bought one 6 years ago and won't install it until they get the check mechanism issue resolved. YMMV.

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[flash]

i think you need to investigate this further before making wide sweeping statements about a 6 year old item that has likely been updated



those of us who have installed this unit have not had any issues - mine is over 2 years old now, and there are ZERO problems



by the way, if you never installed it, how do you know it deteriorates?

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[ldeprat]

[quote name='flash' post='42038' date='Oct 4 2007, 05:16 PM']i think you need to investigate this further before making wide sweeping statements about a 6 year old item that has likely been updated



those of us who have installed this unit have not had any issues - mine is over 2 years old now, and there are ZERO problems



by the way, if you never installed it, how do you know it deteriorates?[/quote]



Several people on Rennlist fitted and bought these and encountered this problem. Hard starts during which the car would have to build oil pressure at start up due to the rubber flap having deteriorated. As you know, engine start up is when lubrication is needed the most. Perhaps you didn't research enough prior to purchasing?



Over the past 6 years we contacted the manufacturer on different occasions about the check valve issue and there have been no developments to date aside from the lid, that now has one bolt instead of 4 allens. What kind of check mechanism does your CM filter have?



As you can imagine, over the past 6 years I did investigate this and reached the conclusion that these filters are not suited for the upright position that the filter has in our cars, whereas they're ideal for dry sump applications where the filter has a guaranteed oil supply at start up.



It's not often that you can out engineer Porsche. This is no exception.



But like I said, YMMV.

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[flash]

i did my homework just fine - i too contacted the manufacturer about this, when i first considered it - after installation, i kept a close eye for start up pressurization rate, and flow change - i looked at the canister and watched the drain rate over long periods - everything is fine



that stuff on rennlist was very old news - clearly either something has changed, or those guys did not know what they were talking about - the negative opinions are very much the minority, and of questionable source - i tend to discount such complaints, especially since i have been carefully watching this over the last 2 years, and have seen nothing but excellent results



the canister is not completely empty when the filter is changed - my car sits for weeks on end between starts, and i have never had the canister completely empty - there is always some oil in there - frankly i would rather it not be full - pressure equalization and maximum flow rate achievement is much faster with no fluid back head to overcome (one reason that dry sumps work so well)



i have to ask - have you had any personal experience with this, or are you merely taking the word of somebody else?

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[ldeprat]

Sorry, but you didn't answer my question. Is the check mechanism still a rubber flap or has this changed?



[quote name='flash' post='42049' date='Oct 4 2007, 09:26 PM']i have to ask - have you had any personal experience with this, or are you merely taking the word of somebody else?[/quote]

Like I said, I bought the item but was not about to expose my engine to unnecessary wear from attempting to out engineer Porsche with a product not suitable for this application. To each his own.



P.S. More feedback from other users.

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[flash]

porsche blew a lot of stuff on this car, so i am never hesitant or afraid to re-engineer their mistakes, or use a better design



as to your question, see for yourself



http://www.968forums.com/index.php?showtopic=89&st=0

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[ldeprat]

[quote name='flash' post='42052' date='Oct 4 2007, 09:56 PM']as to your question, see for yourself



http://www.968forums.com/index.php?showtopic=89&st=0[/quote]



From the photos you posted, it appears the "anti drainback feature" is still the rubber gasket.



Like was pointed out in the thread I posted, the Canton keeps some oil in it while the flap holds up, but not nearly as much as the stock filter with a metal spring.



Believe me, I was very disappointed to end up with a $100 paper weight. But hey, whatever works for you!

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[flash]

seriously - i would not worry about it - i'm not in any hurry to rebuild a perfectly good engine any more than the next guy, but i am not worried at all about this filter



besides, there is an argument to be made that having oil sitting in the filter is BAD - this potentially creates a backhead of load that must be overcome, and the air forward of it pushed out, before oil pressure can be acheived, and the bearings loaded - i've seen this before (not a 968) - we kept spinning bearings because the oil path was so bad - we even tried a squirter to fix it - in the end, we cross-drilled the crank, changed the journal design, and turned the filter so that it was upside down like this one, to really fix it



just because the filter has oil in it does not mean that the bearings do - gravity pulls the oil left in the journals down to the pan



an anti drainback valve also requires a certain amount of pressure before it will open and let oil through - during this time, you get nothing, and the crank is displacing what oil was left on the bearings - i haven't done test to prove this yet, but with the flap, it takes less pressure to open it, so theoretically oil starts getting to the bearings faster - i would rather have a little oil than no oil

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[EEZATOY]

I have a slow leak at the base of my Canton housing - can't seem to get a cood seal and I don't want to crank it down to tight...any suggestions

Sam

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[PorscheDude]

See if you can get a new O-ring from Canton.
Make sure the mating surfaces are clean.

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[flash]

they do sell the seals - i bought a couple of them

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