[Cooling System Upgrade] 1-BAR Radiator Cap - E46Fanatics E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Thread Tools Search this Thread Rating: Thread Rating: 20 votes, 4.80 average. Display Modes
Prev Previous Post   Next Post Next
Old 01-18-2013, 03:18 PM   #28
Registered User
Join Date: Feb 2008
Location: Philadelphia
Posts: 6,919
My Ride: M3 & ZHP
Originally Posted by mkodama View Post
Good info kmulder!

Seems mostly like BMW just opted to have the expansion tank cap act more like an emergency vent valve, and also probably taking into account people using just plain water and at high altitude which lowers everything slightly. It would be nice to know when problems of boiling actually start but that would probably be pretty hard to test.

And also filling to the minimum will be the most dangerous for risking boiling and warping in an overheating situation.

I don't think any government cares about evaporated water.
They might care about the little bit of antifreeze that's released (you've never seen the little bit of dried coolant near the cap?). Net impact is probably minimal, but they do seem to care how much of it makes it into the water eventually. I wouldn't put it past various environmentally inclined lawmakers to demand such measures.

Maybe there's some other reason. But if 2-bar is seldom achieved... Then I can't think of one. Seems like the 1.4 bar caps used on older vehicles would maintain enough of a safety margin for those who don't run the right mixtures.

Last edited by TerraPhantm; 01-18-2013 at 03:20 PM.
TerraPhantm is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON

All times are GMT -5. The time now is 08:24 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
(c) 1999 - VerticalScope Inc. All rights reserved.