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Old 01-09-2013, 09:19 AM   #61
WDE46
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As far as DISA wear goes, I'm sure city miles kill it. I think my car has city miles on it given that mine has more wear than most cars at 70K miles.

If you're referring to the exchange a while beack between me and SeanC I'm kind of annoyed with you. Those were "ball park" figures and estimations. We were trying to see what may be possible. The conclusion we drew is that it is possible for the system to reach the 2 bar limit and that it would be easier to reach this limit by over filling the ET. I don't recall ever claiming the E46 system would run at anything over 2 bar. I also have many hours of lab experience testing a system very similar to our cooling system. I know what I'm doing when it comes to estimating these parameters.

You know I just realized that since I am doing the system overhaul soon, that I could modify the old ET cap or old ET or hose to mount a pressure gauge.

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Old 01-09-2013, 09:41 AM   #62
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Yes, city driving tends to be HARD on everything, even the driver! That's why with some items mileage really does not count, it has to do with revolutions and run hours. A fuel pump runs the entire time the car is running, regardless if the car goes 1 mile or 60 miles in 1 hour. There are many other components that this also is true for on cars and trucks.

The cooling system pressure thread became very hard to track so I did not bother to see where it ended, if it did end! I am sure you could easily reach 2 Bar if there was no room for liquid expansion. Like everything, something has to be the weak link and unfortunately the ET cap does not appear to be the weak link!

I applaud all the back room efforts and I do no question anybody's ability, but the theory really have to be proven in the field. Many times there are unforeseen variables that are overlooked.

I cannot think of a passenger car that I have seen in the past 30+ years that ran a pressure cap much higher than 1 Bar/15 PSI and there is not likely a need for it.

One thing that may not have been taken into considered with some of the ET failures is if the floats may have ever taken on liquid?? I have not seen this, but it is likely possible and would lead to a very easy over filling of the ET while someone was actually trying to do the "proper" thing. I have been around a long time and sometimes to stupidest things trip up even the most seasoned people.

Anyway, 30 PSI into a hard plastic molded tank that is 10 years old and has been through thousands of heat cycles is not something I would want to rely on everyday!

Anyway, we are all screwed with the DISA, it wears out, had many failure modes and now it just went up in price by about $75. So it just means it is becoming more expensive to maintain these cars. Next the expansion tanks will go up in price? at least there are alternate sources, not sure they are as good as OE, but there are options, not so much for the DISA. Also the ET is much cheaper than the DISA!
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Old 01-09-2013, 09:42 AM   #63
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Assume DISA lifespan can be impacted by driving style? Stop and go/city driving likely works the DISA far more than someone that drives primarily highway miles? Also be interested to see if there is a different on manual vs automatic transmission cars? The last one I changed was on an automatic.

As for the expansion tank failures, there are many failure modes of the tank, most split a seam or on the side. Plastic does temper and become brittle with many temp cycles. But there are many documented failures where the ET blew the day or 2 after cooling system work was performed on the car and/or the coolant level was topped off. Overfilling is not the only failure, but it is a common failure that does impact older/neglected cooling systems as well. If I had an unlimited amount of money and time, I would get the air compressor and video camera out and have fun blowing up ET in my off hours!

Not sure why BMW put a 2 Bar cap on these system. There is entire thread here where all the Jr. Scientists claim the E46 cooling system will function up to 3-4 bar??? These guys are out of their minds, there is no reason the cap would even hold that level of pressure, much less the coolant system need or operate at this pressure/temp.

2 Bar is 29 PSI!!! I have never seen any cooling system run a pressure cap this high! Most run about 15 PSI tops. I am guessing BMW put this arbitrary number on the ET cap expecting the ET to function as it is designed and likely the pressures never exceed 10-14 or about 1 Bar?? But over fill the ET, then the 2 Bar pressure limit quickly becomes a possibility. If I was so inclined I would put a fitting in a spare cap or the bleeder screw port and monitor the cooling system pressure on a properly filled ET under typical driving conditions. The Jr. Scientist spent all their time and effort running calculations for thermal expansion and volume, but what these guys fail to understand, run all the calcs you want, you need to prove either with a real model or live device that your calcs were both correct and you did not forget to include assumptions and other real world exterior factors. You could only imagine what the classroom group never learns by never spending 1 day in the field!!

My point was that there are some people who contend that ALL ET failures are due to overfilling. But that is clearly not the case. Mine blew when I was low on fluid. I had checked it before I left the house, but I was out of distilled water, and it was just a bit low, so I let it go. There were defective units in some of the early models, and it was redesigned.
Now, in the DISA discussion, some people are saying that theirs has lasted 10 years, and perhaps others are failing due to driving style. Once again, I doubt that the answer is that simple, and that other factors are involved. BMW may have made material changes to certain parts. They may have moved the assembly to another facility, because the quality standards at the original assembly plant were not up to standard. We will never know. But blaming it on driving style is a lazy way to address the issue. It seems obvious that the quality of the DISA unit seems to vary wildly from one car to another.
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Old 01-09-2013, 09:52 AM   #64
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There were revised part numbers for all the DISA's at some point. Not sure what the differences were, but to revise a part number, something fairly major may have changed??

I am pretty sure we can figure out when the revised part number came out, not sure if we can really understand if and when the revised number was used in production?
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Old 01-09-2013, 10:13 AM   #65
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Holy sh*t at prices now:

Tisch: $271
AutohausAZ: $275
Pelican: $348!!
BMAparts.com: $374!!
eBMWparts.com: $252

etc etc etc. Thank heavens I saved my old one. Maybe it's fixable when the one I have now sh*ts the bed!!
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Old 01-09-2013, 10:30 AM   #66
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Dorman Disa @ Rockauto and Ebay= $129



Someone should try it

http://www.rockauto.com/catalog/more...595&cc=1383230

http://www.ebay.com/itm/Dorman-Intak...f5c82f&vxp=mtr
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Old 01-09-2013, 10:31 AM   #67
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Holy sh*t at prices now:

Tisch: $271
AutohausAZ: $275
Pelican: $348!!
BMAparts.com: $374!!
eBMWparts.com: $252

etc etc etc. Thank heavens I saved my old one. Maybe it's fixable when the one I have now sh*ts the bed!!
WTF the DISA was $190 on BMA in November. It was the cheapest place!
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Old 01-09-2013, 10:53 AM   #68
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Someone should try it
I just bought one from RockAuto. Don't know if I need it yet, but figure I can get my money back out of it in a few days if I don't. (I'll probably hang on to it until I do need it though, who knows what these will cost next year.)
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Old 01-09-2013, 10:55 AM   #69
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I just bought one from RockAuto. Don't know if I need it yet, but figure I can get my money back out of it in a few days if I don't. (I'll probably hang on to it until I do need it though, who knows what these will cost next year.)
Can you post pics of it? extremely good quality with good light at multiple angles?
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Old 01-09-2013, 11:39 AM   #70
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Holy sh*t at prices now:

Tisch: $271
AutohausAZ: $275
Pelican: $348!!
BMAparts.com: $374!!
eBMWparts.com: $252

etc etc etc. Thank heavens I saved my old one. Maybe it's fixable when the one I have now sh*ts the bed!!
WTH!?
Guess there's a shortage on these units, aye.

Glad I got mine done when I did a few months back... And, I'm glad I held onto the old unit.
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Old 01-09-2013, 11:41 AM   #71
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Can you post pics of it? extremely good quality with good light at multiple angles?
Will do. I'll probably start a new thread with it so everyone can weigh in on it.
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Old 01-09-2013, 11:42 AM   #72
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WTH!?
Guess there's a shortage on these units, aye.

Glad I got mine done when I did a few months back... And, I'm glad I held onto the old unit.
Or all these cars are reaching their ten year mark and requiring them more. I'd jack up the prices too. Hell, people need them if they're not willing to rebuild


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Old 01-09-2013, 11:43 AM   #73
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I really like where this thread has gone now.

Finally

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Old 01-09-2013, 03:18 PM   #74
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Those mods are fine and dandy--but better on a NEW DISA unit as opposed to rebuilding your old broken down one. Don't think anyone would argue that.

ZHP, as far as the pin, I already quoted Terraphntm as having the best response for that. did you see it??

Oh well, if my original DISA ever fails, I'll just buy a new one and I'll be good for another decade at least.
In this thread? I don't see it. PM me a link.
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Old 01-09-2013, 06:19 PM   #75
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"If any other part of your DISA valve fails within 5 years of purchase date, we will credit 100% of your original purchase price toward a brand new OEM DISA valve with the upgrade kit already installed. This warranty includes failure of any DISA component, including the vacuum pot, electric vacuum solenoid and bell crank seal."

Somehow, we all missed that part or failed to bring it up. But if the above is true for the $80 rebuild kit, I'm all for it!! If it's true for just the $414 gold kit, then I'm on the fence still!

Edit: Wait, this is TOWARDS a new kit, they won't GIVE you a new BMW disa w/ gold valve, right?

Can the gold valve be purchased independently or is that only for the $414 kit? Their site is very confusing.
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Old 01-09-2013, 08:27 PM   #76
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You can buy the Gold DISA outright at the $400 window.

If you buy their repair flap for the $80ish and your DISA fails in 5 years, you get their gold DISA discounted by the price you paid for the flap.

Do not know if any of this is really a deal or not. Also will a small few person shop be around in 5 years??? It's only $80 some bux anyway??
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Old 01-09-2013, 10:49 PM   #77
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You can buy the Gold DISA outright at the $400 window.

If you buy their repair flap for the $80ish and your DISA fails in 5 years, you get their gold DISA discounted by the price you paid for the flap.

Do not know if any of this is really a deal or not. Also will a small few person shop be around in 5 years??? It's only $80 some bux anyway??
ouch.. that's a tad harsh. You don't even know the guy or how much effort he Alone put into this design, sourcing of materials and actual fabrication of the components for his DISA repair kit.

Quite honestly a design that BMW AG should have done in the first place! Those Germans could take a lesson from Gary on this one.
Just saying.
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Old 01-09-2013, 11:02 PM   #78
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will a small few person shop be around in 5 years??? It's only $80 some bux anyway??

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ouch.. that's a tad harsh. You don't even know the guy or how much effort he Alone put into this design, sourcing of materials and actual fabrication of the components for his DISA repair kit.

Quite honestly a design that BMW AG should have done in the first place! Those Germans could take a lesson from Gary on this one.
Just saying.
Not busting on the guy, but in these times you do not know who will survive both economically and otherwise.

All I am saying is you are only out about $80 if you ever need to try to make a claim on his warranty coverage and cannot get a replacement per the terms.

I recall seeing the Dorman DISA and not sure I would consider it, however, now it may be worth a look. Most Dorman stuff is pretty decent. I guess in a pinch the Dorman may be worth considering or at least you could possibly harvest the vacuum diaphragm from the Dorman unit and consider a GAS flap to possibly save about $50-$60??

Maybe someone can post up Dorman info soon?
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Old 01-10-2013, 01:41 AM   #79
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It seems eeuroparts.com has the best prices for OE DISA now
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Old 01-10-2013, 01:48 AM   #80
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ouch.. That's a tad harsh. You don't even know the guy or how much effort he alone put into this design, sourcing of materials and actual fabrication of the components for his disa repair kit.

Quite honestly a design that bmw ag should have done in the first place! Those germans could take a lesson from gary on this one.
Just saying.
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