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2Addicts | BMW 2-Series forum Technical Topics Mechanical Maintenance and TSBs: Break-in | Oil & Fluids | Servicing | TSB engine cover

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      07-25-2021, 12:16 PM   #1
aerodavew
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engine cover

Is there any harm in leaving the engine cover off?
As hot as these engines get, why trap extra heat in?
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      07-26-2021, 10:46 AM   #2
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Quote:
Originally Posted by aerodavew View Post
Is there any harm in leaving the engine cover off?
As hot as these engines get, why trap extra heat in?
Because my car is garage-kept, I lift the hood before going into the house.

This was Roundel Technical Editor Mike Miller's opinion on the subject in the March, 2019 issue:
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      09-14-2021, 09:18 AM   #3
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if I am correct, it's called a vanity cover.... that's probably all that it is.

Mind you BMW deemed it necessary to have, so who am I to argue
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      09-14-2021, 09:25 AM   #4
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I have a temp gun at home, I should take some temps with and without the cover to see if it does trap heat in.
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      09-14-2021, 09:44 AM   #5
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The B58 engine is deliberately designed to keep as much heat in for as long as possible after shut off to speed warmup after re-start. The "engine encapsulation" system which incorporates the cover and splash shield insulation is designed to retain heat up to 36 hours after shut off.

If the engine temp is within normal operating range when shut off (can be checked using the hidden menu), it doesn't make sense to try to make it cool down faster in any normal use scenario, other than avoiding heat soak of the intake between runs at the track, then you want to just open the hood and not take the engine cover off.

The cooling system during operation should keep the engine at optimum temperature, both too hot and too cold are problems.
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      09-14-2021, 04:38 PM   #6
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Quote:
Originally Posted by aerobod View Post
The B58 engine is deliberately designed to keep as much heat in for as long as possible after shut off to speed warmup after re-start. The "engine encapsulation" system which incorporates the cover and splash shield insulation is designed to retain heat up to 36 hours after shut off.

If the engine temp is within normal operating range when shut off (can be checked using the hidden menu), it doesn't make sense to try to make it cool down faster in any normal use scenario, other than avoiding heat soak of the intake between runs at the track, then you want to just open the hood and not take the engine cover off.

The cooling system during operation should keep the engine at optimum temperature, both too hot and too cold are problems.
IIRC, one of Mike Miller's bugaboos has been the plastic used in BMW cooling systems. This going back for a number of generations. I suspect he's been recommending a hood pop when parking the car to relieve those components from extended periods of high temperatures.

At the same time, I don't doubt that BMW, along with other manufacturers, are taking advantage of improvements in materials science as they relate to the plastics available for use in high-heat environments. BMW would certainly cut it close, though, if that saved even a small amount; perhaps that has something to do with the M235i/N55 charge pipe failures.
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      09-15-2021, 02:13 PM   #7
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Best thing you can do is not drive your car.

I'm not sure on the exact science behind it, especially with these plastics. But, heat cycles will happen every time you start your car. I don't see how cooling your car faster would help anything, the damage is done.

https://en.wikipedia.org/wiki/Thermal_stress

"In mechanics and thermodynamics, thermal stress is mechanical stress created by any change in temperature of a material. These stresses can lead to fracturing or plastic deformation depending on the other variables of heating, which include material types and constraints.[1] Temperature gradients, thermal expansion or contraction and thermal shocks are things that can lead to thermal stress. This type of stress is highly dependent on the thermal expansion coefficient which varies from material to material. In general, the greater the temperature change, the higher the level of stress that can occur. Thermal shock can result from a rapid change in temperature, resulting in cracking or shattering. "

I also noticed drier climates degrade some plastics a little sooner, salt spray likely doesn't do any favours either.
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