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2009 BMW 3-Series

276 messages,  Last post on Aug 25, 2009 at 9:57 PM

You are in the BMW 3-Series Forum. Your Hosts are pat & karens

What is this discussion about? BMW 3 Series, BMW, Sedan, Wagon


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#40 of 276
Re: car color Vs engine temperature [jmaroun] by roadburner
Sep 07, 2008 (5:52 am)
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Replying to: jmaroun (Sep 06, 2008 8:01 pm)

Fascinating.
#41 of 276
Re: car color Vs engine temperature [roadburner] by kdshapiro
Sep 07, 2008 (6:11 pm)
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Replying to: roadburner (Sep 07, 2008 5:52 am)

This would be analagous to the conversation of "should I turn my pc off when not in use or leave it on 24x7".
 
My own observation, which is matched by physical measurement is that lighter color cars tend to absorb less heat in the interior as the material reflects more than dark colors. However, we all could be wrong. :sick
#42 of 276
Re: car color Vs engine temperature [kdshapiro] by fedlawman
Sep 07, 2008 (7:14 pm)
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Replying to: kdshapiro (Sep 07, 2008 6:11 pm)

I wrapped my M3 in tin foil (shiny side up) and it lowered the cabin air temp by 6 degrees!
 
A side benefit is that I never have to wash or wax my car, and in the summer, I can bake cookies on the hood!
#43 of 276
Re: car color Vs engine temperature [fedlawman] by kdshapiro
Sep 08, 2008 (5:46 am)
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Replying to: fedlawman (Sep 07, 2008 7:14 pm)

You're being green by using sun energy to cook. LMAO!
#44 of 276
Re: car color Vs engine temperature [fedlawman] by roadburner
Sep 08, 2008 (12:44 pm)
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Replying to: fedlawman (Sep 07, 2008 7:14 pm)

Hey, quit joking around!
Some of us hard-core drivers need to know which color is fastest- even if we never drive our cars over 80!
#45 of 276
Re: car color Vs engine temperature [roadburner] by laurasdada
Sep 08, 2008 (12:51 pm)
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Replying to: roadburner (Sep 08, 2008 12:44 pm)

Please, everyone knows you choose a car color to match your eyes! Hard to find cars painted bloodshot, however...
 
After owning a series of white and silver (and variations) cars, I went with a darker blue on my current ride. Hot or cold isn't important to me. The fact it simply shows dirt and imperfections more is what is driving me insane! Zaino, of course, helps. But I will lighten it a shade or two for my next ride... I shan't own a black car...
 
Still like a good white, though...
#46 of 276
Re: car color Vs engine temperature [jmaroun] by jmaroun
Sep 08, 2008 (4:09 pm)
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Replying to: jmaroun (Sep 06, 2008 8:01 pm)

http://www.newton.dep.anl.gov/askasci/eng99/eng99494.htm
 
It seems this assumption is wrong:
"This is due to black's inherently superior infrared conductivity."
 
I stand corrected. All the more reason to hope bmw fixed the
335i's over-heating issues then.
 
fingers crossed.
 
Joseph
San Diego
-------------------------------
Regarding exterior color paint, black, white, and blue suit my asthetic
tastes equally. I decided therefore, to base my choice on utility.
At first I thought the optimal choice was obvious. Everyone knows that
white absorbs less light and thus would keep interior cabin temperature cooler than black. Alas, a white 08 335i sedan was unavailable in my favorite configuration: manual with sports package. A case of bad luck. I was forced to choose the very opposite color. Black!
  
After some thought however, I've realized my luck wasn't as bad as I'd thought. Especially considering that a 335i's engine has a known tendency to run a "little" on the hot side. A black car, better than any other color, should actually help dissipate the most engine heat. This is due to black's inherently superior infrared conductivity.
  
Interior cabin temperature is merely transient..that is AC climate control corrects it in a matter of seconds no matter what color your car is. Hot black sheet metal will dissipate heat absorbed from the sun, when moving air pass over it, faster than white or silver sheet metal. Heat from a running or recently turned off engine, far out weighs solar power that shines on a car. Therefore.. it probably is better to have a black car if one's interest is help keep its engine coolest. An engine that runs cooler not only performs better, but in the long haul will be more reliable.
  
Of course this is just speculative reason and I have no idea how significant a car's color would have on the net temperature of a running, or recently idle, engine. I suppose if one had access to a data-base of automobile over-heating reports, one could check to see if black cars fared better than say silver or white cars. That would be strong evidence supporting my above speculations.
  
Empirical evidence on this would be interesting. If anyone knows of any, please share. Especially regarding the 335i.
#47 of 276
Re: car color Vs engine temperature [laurasdada] by roadburner
Sep 08, 2008 (4:54 pm)
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Replying to: laurasdada (Sep 08, 2008 12:51 pm)

I shan't own a black car...
 
My driveway is a 2500' gravel farm road. When I had my black M6 I think it was clean for maybe 30 minutes over the three years I had it.
#48 of 276
Re: car color Vs engine temperature [jmaroun] by kdshapiro
Sep 09, 2008 (4:21 am)
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Replying to: jmaroun (Sep 08, 2008 4:09 pm)

What over heating are you referring to? The only reference I've been able to find to 2009 BMW overheating issues is from a poster named jmaroun in townhall.edmunds.com. The only reference in all of internet-land.
 
It is true a minority of BMWs may have suffered mechanical issues, but all manufacturers have this. Want a bullet proof car, don't buy one.
#49 of 276
Re: car color Vs engine temperature [kdshapiro] by shipo
Sep 09, 2008 (5:20 am)
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Replying to: kdshapiro (Sep 09, 2008 4:21 am)

I'm thinking that you should save your breath, many of us have been suggesting to jmaroun that he'd be much-much happier with a Lexus with aftermarket 22" wheels and rubber band tires, but he seems insistent on becoming an unhappy 335i owner. I mean, come on, he's already complaining about mechanical issues and he doesn't even have a car yet. Go figure.
 
Best regards,
Shipo

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