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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 05-09-2013, 03:18 PM
jimduke jimduke is offline
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Heat shield for the 335is hood???

Bought a 2012 335is with 5000 miles. Has no heat shield attached to the underside of the hood. Dealer says they are made without them.
Sound legit to you guys?
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  #2  
Old 05-09-2013, 03:24 PM
daytrader daytrader is offline
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Quote:
Originally Posted by jimduke View Post
Bought a 2012 335is with 5000 miles. Has no heat shield attached to the underside of the hood. Dealer says they are made without them.
Sound legit to you guys?
Yes, but you can buy one and retro fit the last I knew, if you want one in place. My 2010 didn't come with one. Paint damage because of heat has not been an issue, plus I like the sound of the turbo noise coming from under the hood undampened by a shield.
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  #3  
Old 05-09-2013, 03:43 PM
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Zeichen311 Zeichen311 is offline
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Originally Posted by jimduke View Post
Bought a 2012 335is with 5000 miles. Has no heat shield attached to the underside of the hood. Dealer says they are made without them.
Sound legit to you guys?
Yes. The under-hood sound insulation panel was deleted in '09 or '10 as a cost-cutting measure. Should you want to retrofit it, the part costs ~$80 with clips and installation takes all of five minutes.
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  #4  
Old 05-09-2013, 05:27 PM
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CALWATERBOY CALWATERBOY is offline
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Originally Posted by jimduke View Post
Bought a 2012 335is with 5000 miles. Has no heat shield attached to the underside of the hood. Dealer says they are made without them.
Sound legit to you guys?

Many posts 'bout that - look in this forum and you'll find 'em with part numbers, experience installing, etc....

Wasn't the Professor our expert?
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  #5  
Old 05-09-2013, 07:46 PM
BuraQ BuraQ is offline
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Originally Posted by jimduke View Post
Bought a 2012 335is with 5000 miles. Has no heat shield attached to the underside of the hood. Dealer says they are made without them.
Sound legit to you guys?
LMAO ! Dude I was thinking someone ripped mine off till I saw this post
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  #6  
Old 05-09-2013, 11:17 PM
sptt144 sptt144 is offline
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Yep....'09 335 with no heat shield.

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  #7  
Old 05-13-2013, 06:10 AM
smbmw3 smbmw3 is offline
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Is it actually a heat shield or an insulating pad? If it is insulating, that dang engine runs so hot I wouldn't add one.
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  #8  
Old 05-13-2013, 07:04 AM
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Zeichen311 Zeichen311 is offline
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Originally Posted by smbmw3 View Post
Is it actually a heat shield or an insulating pad? If it is insulating, that dang engine runs so hot I wouldn't add one.
Well if you think about it, those are the same in that both reduce the amount of heat that escapes the engine bay. If anything, a heat shield would be worse because it reflects heat rather than absorbing it.

Officially, the pad is sound insulation.
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   N47 35' 30.13" E11 10' 33.36" - End of break-in...you can guess what came next. BMW CCA

Last edited by Zeichen311; 05-13-2013 at 07:06 AM.
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  #9  
Old 05-13-2013, 07:05 AM
daytrader daytrader is offline
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Originally Posted by smbmw3 View Post
Is it actually a heat shield or an insulating pad? If it is insulating, that dang engine runs so hot I wouldn't add one.
Sound.
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  #10  
Old 05-13-2013, 09:47 AM
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bear-avhistory bear-avhistory is offline
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Its for sound...hood gets real hot, put your hand on it. Do you want to keep that heat inside the engine compartment or let the hood radiate it off?
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  #11  
Old 05-13-2013, 12:36 PM
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BB_cuda BB_cuda is offline
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Originally Posted by bear-avhistory View Post
Its for sound...hood gets real hot, put your hand on it. Do you want to keep that heat inside the engine compartment or let the hood radiate it off?
Errr um you mean convect the heat off. Even sitting still, there will be more convection wafting upwards. At 80 mph, a ton of convection is happening under the hood as well as above it. Radiation heat transfer starts to be more significant when the delta T is 200F or more. Now if you convert your 3 series to spaceship and fly it where no atmosphere exists then radiation is mucho importante.
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  #12  
Old 05-13-2013, 12:51 PM
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DSXMachina DSXMachina is offline
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Originally Posted by BB_cuda View Post
Errr um you mean convect the heat off. Even sitting still, there will be more convection wafting upwards. At 80 mph, a ton of convection is happening under the hood as well as above it. Radiation heat transfer starts to be more significant when the delta T is 200F or more. Now if you convert your 3 series to spaceship and fly it where no atmosphere exists then radiation is mucho importante.
Way too expensive a proposition, what with cabin pressurization and oxygen supply issues, let alone addition of re-entry tiles, etc. Much easier to just bolt on a couple aftermarket flux capacitors and be happy with time travel.
Gotta go, I'm heading back to 1978 to convince young Christopher Bangle that his true calling is to go to work for Audi.
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  #13  
Old 05-13-2013, 01:12 PM
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bocabimmer bocabimmer is offline
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Heat shield for the 335is hood???

Quote:
Originally Posted by DSXMachina View Post
Way too expensive a proposition, what with cabin pressurization and oxygen supply issues, let alone addition of re-entry tiles, etc. Much easier to just bolt on a couple aftermarket flux capacitors and be happy with time travel.
Gotta go, I'm heading back to 1978 to convince young Christopher Bangle that his true calling is to go to work for Audi.
Cabin pressure is no problem, that's why BMW switched to rubber door seals instead of felt.


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Old 05-13-2013, 03:15 PM
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Papers lifted on rising convective air current from warm radiator
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