Xoutpost.com - View Single Post - Cooling system runs at 2 bar, thoughts on 1.4 bar?

Ricky Bobby · #50 02-10-2014, 07:09 PM

Again and I'm glad Slick chimed in, as well as Dorin. I understand and agree with JCL that it was spec'ed for a reason, but I still will most likely switch to an E30 1.4 bar cap down the line. My M54 doesn't get run in the Arizona desert, and even after running in the summer and shutting down when hot, my pressures won't rise high enough to 2 bar, or even come close to 1.4 bar.

My hoses, expansion tank, t-stat, are all new and my coolant is filled to proper level with 50/50 mix. The first thing like I said earlier in the thread, be sure your cooling system is up to snuff first, coolant cap pressure should be last thing to worry about.

I'm not gonna argue in here with the others, but there are members running the 1.2 or 1.4 bar (in Slick's case) cap with not a single issue whatsoever, no losses of coolant anymore than before they switched the cap, so this tells us that the system pressures don't go anywhere near the 1.4 bar E30 cap, let alone ever get to 2 bar.

Point is, if the system is getting enough pressure to vent at 2 bar, you better be pulled over with the car off bc you have bigger problems.

Since I would never let my system get up to those kind of pressures, I have no issues using an OEM 1.4 bar coolant cap in the future, or a GAS 1.2 bar cap as well.

It's not about "using the correct cap", its about making sure your system is up to snuff, parts wise, mixture of coolant wise, etc. Like I said prob on the first 1 or 2 pages, REPLACING THE COOLING CAP IS NOT A SOLUTION TO ANY PROBLEM WHATSOEVER. But as Slick has shown, and many many E39/E46 members have shown on forums outside of Xoutpost, there are no negative effects to lowering the "safety valve" on our cooling systems to 1.4 bar with an OEM BMW part.

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