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Why do cars have plastic shrouds over the engine?


What is the purpose of plastic engine covers?New headlight lenses?Broken power window switch on 1998 OutbackConequences and remedies of a cam seal leakWhy is oil on my throttle body hose?2001 Subaru Outback - Shaking at StopSubaru Outback - can spin one rear wheel with auto transmission in ParkShould I be concerned about rusty exhaust pipe on used car?Subaru 2005 Forrester Squealing like a pigValve (most likely) hitting crank case: complete engine replacement?Front wheel moving in ways it really shouldn't













8















My 2005 Subaru Outback (3.0 flat 6) has a plastic cover under the hood which covers the engine.



Or it had -- I had some work done and the mechanic has given the car back to me without the shroud.



What is the point of these shrouds?



Should I ask for it to be put back?










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  • Possible duplicate of What is the purpose of plastic engine covers?

    – user71659
    9 mins ago
















8















My 2005 Subaru Outback (3.0 flat 6) has a plastic cover under the hood which covers the engine.



Or it had -- I had some work done and the mechanic has given the car back to me without the shroud.



What is the point of these shrouds?



Should I ask for it to be put back?










share|improve this question







New contributor




tgdavies is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





















  • Possible duplicate of What is the purpose of plastic engine covers?

    – user71659
    9 mins ago














8












8








8








My 2005 Subaru Outback (3.0 flat 6) has a plastic cover under the hood which covers the engine.



Or it had -- I had some work done and the mechanic has given the car back to me without the shroud.



What is the point of these shrouds?



Should I ask for it to be put back?










share|improve this question







New contributor




tgdavies is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












My 2005 Subaru Outback (3.0 flat 6) has a plastic cover under the hood which covers the engine.



Or it had -- I had some work done and the mechanic has given the car back to me without the shroud.



What is the point of these shrouds?



Should I ask for it to be put back?







subaru






share|improve this question







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tgdavies is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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share|improve this question







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share|improve this question




share|improve this question






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asked 5 hours ago









tgdaviestgdavies

1413




1413




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  • Possible duplicate of What is the purpose of plastic engine covers?

    – user71659
    9 mins ago



















  • Possible duplicate of What is the purpose of plastic engine covers?

    – user71659
    9 mins ago

















Possible duplicate of What is the purpose of plastic engine covers?

– user71659
9 mins ago





Possible duplicate of What is the purpose of plastic engine covers?

– user71659
9 mins ago










4 Answers
4






active

oldest

votes


















18














Mostly the point is, to make it "look good".



There is arguably some protection for wires and pipes underneath against animals chewing on them, depending on how its implemented.



While it may be technically unimportant, I´d still ask to get that part back. First and foremost if you ever want to sell the car, potential buyers can get a bad impression if there are parts missing. This can affect resale value. Second, any mechanic should return a car in the same good state he got it in, unless otherwise agreed.






share|improve this answer































    7














    The other function can be to control cooling airflow, so yes, get them to put it back - even if they have to buy one...






    share|improve this answer































      4














      On petrol engines the cover can help protect against water accumulating on top of the engine and interfering with the coil packs/ignition.



      Rain/condensation can get into the engine bay and over time the water can build up around where the coil packs plug in to the engine. When the rubber seals around the coil packs get old they can start to let water through causing misfires. I know this because it happened to me






      share|improve this answer








      New contributor




      James is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.




























        0














        The cover is purely not cosmetic and serves several purposes, one is to reduce engine noise. You often notice there's foam on the inside and they fit over components such as cams and injectors.



        A second function is thermal insulation. It prevents heat from escaping components such as the exhaust manifold and propagating to the cooler parts of the engine, such as electronics, electrical cables, sensors and wiring.



        In some cases, they even serve a crash safety function. A press release for a Volvo engine cover states:




        The tailor-made PU foam Elastofoam® I makes it possible to produce engine covers that are characterized by good sound absorption and thermal engine encapsulation... The part can absorb a lot of energy on account of the open-cell foam structure, thus increasing passive safety for pedestrians in the event of impact against the hood.




        For long-term reliability, the cover should be replaced.






        share|improve this answer

























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          4 Answers
          4






          active

          oldest

          votes








          4 Answers
          4






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          18














          Mostly the point is, to make it "look good".



          There is arguably some protection for wires and pipes underneath against animals chewing on them, depending on how its implemented.



          While it may be technically unimportant, I´d still ask to get that part back. First and foremost if you ever want to sell the car, potential buyers can get a bad impression if there are parts missing. This can affect resale value. Second, any mechanic should return a car in the same good state he got it in, unless otherwise agreed.






          share|improve this answer




























            18














            Mostly the point is, to make it "look good".



            There is arguably some protection for wires and pipes underneath against animals chewing on them, depending on how its implemented.



            While it may be technically unimportant, I´d still ask to get that part back. First and foremost if you ever want to sell the car, potential buyers can get a bad impression if there are parts missing. This can affect resale value. Second, any mechanic should return a car in the same good state he got it in, unless otherwise agreed.






            share|improve this answer


























              18












              18








              18







              Mostly the point is, to make it "look good".



              There is arguably some protection for wires and pipes underneath against animals chewing on them, depending on how its implemented.



              While it may be technically unimportant, I´d still ask to get that part back. First and foremost if you ever want to sell the car, potential buyers can get a bad impression if there are parts missing. This can affect resale value. Second, any mechanic should return a car in the same good state he got it in, unless otherwise agreed.






              share|improve this answer













              Mostly the point is, to make it "look good".



              There is arguably some protection for wires and pipes underneath against animals chewing on them, depending on how its implemented.



              While it may be technically unimportant, I´d still ask to get that part back. First and foremost if you ever want to sell the car, potential buyers can get a bad impression if there are parts missing. This can affect resale value. Second, any mechanic should return a car in the same good state he got it in, unless otherwise agreed.







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered 4 hours ago









              DanielDaniel

              98617




              98617























                  7














                  The other function can be to control cooling airflow, so yes, get them to put it back - even if they have to buy one...






                  share|improve this answer




























                    7














                    The other function can be to control cooling airflow, so yes, get them to put it back - even if they have to buy one...






                    share|improve this answer


























                      7












                      7








                      7







                      The other function can be to control cooling airflow, so yes, get them to put it back - even if they have to buy one...






                      share|improve this answer













                      The other function can be to control cooling airflow, so yes, get them to put it back - even if they have to buy one...







                      share|improve this answer












                      share|improve this answer



                      share|improve this answer










                      answered 4 hours ago









                      Solar MikeSolar Mike

                      18.7k21132




                      18.7k21132























                          4














                          On petrol engines the cover can help protect against water accumulating on top of the engine and interfering with the coil packs/ignition.



                          Rain/condensation can get into the engine bay and over time the water can build up around where the coil packs plug in to the engine. When the rubber seals around the coil packs get old they can start to let water through causing misfires. I know this because it happened to me






                          share|improve this answer








                          New contributor




                          James is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                          Check out our Code of Conduct.

























                            4














                            On petrol engines the cover can help protect against water accumulating on top of the engine and interfering with the coil packs/ignition.



                            Rain/condensation can get into the engine bay and over time the water can build up around where the coil packs plug in to the engine. When the rubber seals around the coil packs get old they can start to let water through causing misfires. I know this because it happened to me






                            share|improve this answer








                            New contributor




                            James is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                            Check out our Code of Conduct.























                              4












                              4








                              4







                              On petrol engines the cover can help protect against water accumulating on top of the engine and interfering with the coil packs/ignition.



                              Rain/condensation can get into the engine bay and over time the water can build up around where the coil packs plug in to the engine. When the rubber seals around the coil packs get old they can start to let water through causing misfires. I know this because it happened to me






                              share|improve this answer








                              New contributor




                              James is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                              Check out our Code of Conduct.










                              On petrol engines the cover can help protect against water accumulating on top of the engine and interfering with the coil packs/ignition.



                              Rain/condensation can get into the engine bay and over time the water can build up around where the coil packs plug in to the engine. When the rubber seals around the coil packs get old they can start to let water through causing misfires. I know this because it happened to me







                              share|improve this answer








                              New contributor




                              James is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                              Check out our Code of Conduct.









                              share|improve this answer



                              share|improve this answer






                              New contributor




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                              answered 2 hours ago









                              JamesJames

                              1413




                              1413




                              New contributor




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                              New contributor





                              James is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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                              James is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                              Check out our Code of Conduct.























                                  0














                                  The cover is purely not cosmetic and serves several purposes, one is to reduce engine noise. You often notice there's foam on the inside and they fit over components such as cams and injectors.



                                  A second function is thermal insulation. It prevents heat from escaping components such as the exhaust manifold and propagating to the cooler parts of the engine, such as electronics, electrical cables, sensors and wiring.



                                  In some cases, they even serve a crash safety function. A press release for a Volvo engine cover states:




                                  The tailor-made PU foam Elastofoam® I makes it possible to produce engine covers that are characterized by good sound absorption and thermal engine encapsulation... The part can absorb a lot of energy on account of the open-cell foam structure, thus increasing passive safety for pedestrians in the event of impact against the hood.




                                  For long-term reliability, the cover should be replaced.






                                  share|improve this answer






























                                    0














                                    The cover is purely not cosmetic and serves several purposes, one is to reduce engine noise. You often notice there's foam on the inside and they fit over components such as cams and injectors.



                                    A second function is thermal insulation. It prevents heat from escaping components such as the exhaust manifold and propagating to the cooler parts of the engine, such as electronics, electrical cables, sensors and wiring.



                                    In some cases, they even serve a crash safety function. A press release for a Volvo engine cover states:




                                    The tailor-made PU foam Elastofoam® I makes it possible to produce engine covers that are characterized by good sound absorption and thermal engine encapsulation... The part can absorb a lot of energy on account of the open-cell foam structure, thus increasing passive safety for pedestrians in the event of impact against the hood.




                                    For long-term reliability, the cover should be replaced.






                                    share|improve this answer




























                                      0












                                      0








                                      0







                                      The cover is purely not cosmetic and serves several purposes, one is to reduce engine noise. You often notice there's foam on the inside and they fit over components such as cams and injectors.



                                      A second function is thermal insulation. It prevents heat from escaping components such as the exhaust manifold and propagating to the cooler parts of the engine, such as electronics, electrical cables, sensors and wiring.



                                      In some cases, they even serve a crash safety function. A press release for a Volvo engine cover states:




                                      The tailor-made PU foam Elastofoam® I makes it possible to produce engine covers that are characterized by good sound absorption and thermal engine encapsulation... The part can absorb a lot of energy on account of the open-cell foam structure, thus increasing passive safety for pedestrians in the event of impact against the hood.




                                      For long-term reliability, the cover should be replaced.






                                      share|improve this answer















                                      The cover is purely not cosmetic and serves several purposes, one is to reduce engine noise. You often notice there's foam on the inside and they fit over components such as cams and injectors.



                                      A second function is thermal insulation. It prevents heat from escaping components such as the exhaust manifold and propagating to the cooler parts of the engine, such as electronics, electrical cables, sensors and wiring.



                                      In some cases, they even serve a crash safety function. A press release for a Volvo engine cover states:




                                      The tailor-made PU foam Elastofoam® I makes it possible to produce engine covers that are characterized by good sound absorption and thermal engine encapsulation... The part can absorb a lot of energy on account of the open-cell foam structure, thus increasing passive safety for pedestrians in the event of impact against the hood.




                                      For long-term reliability, the cover should be replaced.







                                      share|improve this answer














                                      share|improve this answer



                                      share|improve this answer








                                      edited 3 mins ago

























                                      answered 12 mins ago









                                      user71659user71659

                                      1214




                                      1214






















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