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  #1  
Old 12-05-2013, 12:19 PM
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Cooling system runs at 2 bar, thoughts on 1.4 bar?

So yea, ever since I developed that retarded leak in the valley pan area. I have been making up a huge part list and doing a shit load of research. Our BMW cooling system runs at 2 bar. Yes, that is nearly 30 psi of pressure. The new BMW cars, seem to be running at 1.2 to 1.4 bar.

Here is why I am questioning this 2 bar pressure cap on our cars.

I did a cooling overhaul as my expansion tank cracked. I couldn't get to all the hoses, and clearly some gaskets. I replaced the damn cap too. I need to find if I still have my old cap, because I am sort of suspecting that it was not 2 bar.

So, I now have a leak.

Now I have been doing a lot of reading, and it seems quite a few people are switching to the 335i cap, which is 1.4 bar, and the system runs fine.

The industry standard for coolant pressure is 1bar. Thew new BMW are 1.2 bar. I think the 2 bar caps are overdose for our systems, and are actually to blame for the catastrophic coolant hose and component failures.

Does anyone have any experience with putting on a lower pressure relief cap on the e53? This just makes way more sense.
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  #2  
Old 12-05-2013, 12:26 PM
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how much is the 335i cap?

German Auto Solutions sells a 1.2 bar cap in anodized black and red, as apparently they think the system pressure is too high as well. Its 35 bucks, but I'm definitely going to put a lower pressure cap on my X.

If the 335i cap is cheaper, and fits our expansion tanks, let me know and I'll get one of those man!

EDIT: I don't think the 335i cap fits the M54, but it might cross reference on the 8 cylinder expansion tanks!

Here is the link for the GAS cap:

Buy G.A.S. BMW 1.2 Bar Coolant Cap
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Old 12-05-2013, 01:47 PM
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The E93 335i cap is $12.00
Home Page Search SiteSearch 17117521071 ES#38106 Coolant Expansion Tank Cap - 17117521071

There must be some factory 1.4 cap that fits the M54. The GAS cap is not that expensive though.

The more I read on this, the more I question this 2 Bar pressure that we are running, with plastic parts. The only reason I see us needing 2 bar vent, is when you shut the car off, the pressure in the system can spike. Pressure will build, and we have a chance to vent, thus spill coolant out with the lower pressure cap.

But, this will spill the coolant out through the cap, and not blow a damn hose out. I think this is exactly why my car has a leak all of a sudden. I replaced a lot of hoses, tank, cap. I couldn't get to two hoses, which I will get to now. So, without really confirming this with a pressure tester, I have a feeling I moved the next weakest link down the coolant system chain, and now either blew the rear manifold hose, or the valley pan gasket.
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Old 12-05-2013, 01:55 PM
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I agree with all you're saying, basically unless you replace all the parts you are putting stronger parts in the system (new) and leaving older, weaker parts in, and with 30 psi, you're bound to force a leak somewhere.

I'll be picking up a GAS cap to keep my pressure at manageable levels and to pre-emptively hopefully extend the life of my cooling system components. GAS doesn't mess around, their DISA rebuild kits are bulletproof so I don't gather I will have any ill effects from this.
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Old 12-05-2013, 02:14 PM
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There are a shit load of people on bimmerforums that are running the GAS 1.2 bar caps. The e39 guys too.

I have a feeling the V8 cap, and your cap are the same. GAS doesn't list the 4.8is on the fitment, but it does list the the E65/E66 740 and 750. A quick part search on RealOEM shows us that your cap, and mine are the same.

RealOEM.com * Part Cross-reference

So the 335i 1.4 bar cap should fit your car as well.
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Old 12-05-2013, 02:22 PM
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awesome, yeah I saw that.

Its definitely a bigger cap than stock though, that might bother me. Either way I think you and I definitely need to start a revolution switching to 1.2 bar caps.
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Old 12-05-2013, 02:31 PM
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GOSH DARN I AM 2 FOR 2 TODAY, I'LL TAKE ANOTHER CIGAR PLEASE!

Want an OEM looking 1.4 bar coolant cap that will fit the E53 tanks?

E30 cap FTMFW, you're welcome! and it's 15 bucks from BMW

Home Page Search SiteSearch 17111742232 ES#37938 Expansion Tank Cap - 17111742232
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Old 12-05-2013, 02:35 PM
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I am going to go with the factory e93 1.4 bar cap just to test. First I need to figure out my damn leak, fix it, monitor the KTMP in the OBC with the factory cap, and then switch to the 1.4 cap while also monitoring the KTMP. I don't want to deal with any weird temp issues.

It doesn't make sense why we are running 2 bar, when Ferrari is .9 to 1.1

Industry standard is 1 to 1.4 bar.

No shit BMW recommends you overhaul the entire cooling system when you get a leak.
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Old 12-05-2013, 02:37 PM
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Quote:
Originally Posted by Ricky Bobby View Post
GOSH DARN I AM 2 FOR 2 TODAY, I'LL TAKE ANOTHER CIGAR PLEASE!

Want an OEM looking 1.4 bar coolant cap that will fit the E53 tanks?

E30 cap FTMFW, you're welcome! and it's 15 bucks from BMW

Home Page Search SiteSearch 17111742232 ES#37938 Expansion Tank Cap - 17111742232
Even better. Looks like mine. Thanks.
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Old 12-05-2013, 02:40 PM
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Look what I found. 1.2 bar E30 cap. Whaaaaat

Home Page Search SiteSearch 17114379047 ES#38066 Expansion Tank Cap - 17114379047
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