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BMW 3-Series (E90 E92) Forum
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Vented hood or ducts (ST users)
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07-14-2020, 06:10 PM | #23 |
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07-15-2020, 03:59 AM | #24 |
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07-15-2020, 05:13 AM | #25 | |
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The carbon fiber material used should be a composite of carbon fiber in resin, otherwise will be a bit....floppy. Thermal conductivity is very very low. Even iron is over 10X more conductive, so whatever steel's used is going to reject heat far better than carbon fiber, and sure enough our stock hoods are much warmer after a drive. Interestingly the most conductive material by far is carbon....as diamond! Who knew? |
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07-15-2020, 12:05 PM | #26 | ||
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I can touch the underside of the hood after a spirited car ride and it doesn't feel hot at all. No way this hood conducts heat over the heavy steel pot cover. |
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07-15-2020, 12:46 PM | #27 | |
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Edit: I don't see any vents on your hood so nvm. Last edited by lwgrenier; 07-15-2020 at 12:48 PM.. Reason: I don't see any vents on your hood so nvm. |
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07-15-2020, 03:17 PM | #28 | ||
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And yeah I don't have vents never stated I did, but I did state that I do have the cowl removed and the BMS cowl filters so the heat just flys out the back side. I literally "see" the heat waves on the bottom of my windshield. So explain this to me smart guy. How come my engine oil temps with the steel hood would reach 260+ with 15 minutes of spirited driving, but once I replaced the hood my engine temps barely reach 250 on 30-1hr of spirited driving now? No other modifications have been made. |
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07-15-2020, 03:31 PM | #29 |
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Playing devil's advocate here......but there are a lot of other factors that could attribute to a 10 degree swing in oil temps.
Ambient air temp the same? Was is the same section of road? Was the humidity the same? Was is cloudy/sunny out? Same brand/weight of engine oil? 10 degrees isn't a very big change..... ambient air temps alone could do that....if you want to get scientific about it. |
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07-15-2020, 03:49 PM | #30 | |
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Edit: The same would be true in reverse as well. If your car was sitting in the sun all day the engine bay would probably be warmer on startup with the steel hood than the CF. Last edited by lwgrenier; 07-15-2020 at 04:02 PM.. |
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07-15-2020, 04:05 PM | #31 | |
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My hood's very warm....fairly sure no plastic liner but it's not here now. Your year? Mine's '09 |
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07-15-2020, 04:07 PM | #32 | |
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Cowl filters removed both runs? |
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07-15-2020, 04:49 PM | #33 | ||
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My theory is that the hot air has the ability to escape much easier due to weightless hood. I'll give you an example. After heavy spirited runs for 30 min, my OEM hood would be on fire on the touch, after popping it open really quick I would walk away because of the immense heatwave/air was so hot and intense. Now that's not the case, obviously the hood is not nearly as hot and when I pop it open I don't feel a whoosh or air, just a typical hot BMW engine. |
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07-16-2020, 10:11 AM | #34 | |
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07-20-2020, 12:08 PM | #35 |
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I don't do carwash but I had no issues with me washing it myself, as far as rain Im in California so it hardly rains but the times that I got caught no issues.
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07-21-2020, 11:10 PM | #37 |
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If you have DCI and not a factory air box, vents on the hood will be a problem when it rains. Hydro locking the engine anyone?
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