Why Do Cars Lose BHP Over The Years?

Notices
 

Thread: Why Do Cars Lose BHP Over The Years?

Reply to Thread
Page 1 of 3 123 LastLast
Results 1 to 10 of 26
  1. Why Do Cars Lose BHP Over The Years? 
    #1
    BMW Fanatic
    Car Details
    terry54661's Car Details
    Model of Car:
    323 Ci
    Year of Manufacture:
    1999 - 86000 miles
    Transmission Type:
    manual
    Car Body Type:
    Coupe
    terry54661's Avatar
    Join Date
    Sep 2011
    Location
    Milton Keynes UK
    Posts
    88
    Thanks
    63
    Thanked 21 Times in 18 Posts
    I often wonder this,

    A new car may have a spec of say 185 BHP over the years this become less. What is happening to the engine to cause this! What major part/s are wearing out? Is it possible to take a 10 year old car and give it back its original BHP?
     
     

  2. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  3.  
    #2
    BMW Maestro
    Car Details
    hontoir's Car Details
    Model of Car:
    320Ci
    Year of Manufacture:
    2003
    Transmission Type:
    Manual
    Car Body Type:
    Coupe
    hontoir's Avatar
    Join Date
    Aug 2010
    Location
    Wales/Southampton
    Posts
    503
    Thanks
    151
    Thanked 152 Times in 129 Posts
    Piston rings and liners wear, reducing compression.
    Valve seats can become clogged with products of combustion, possibly reducing amount of air entering the combustion space, or increasing the backpressure from the exhaust.
    Quality of spark can be reduced.
    Fuel injector nossles become clogged, either reducing the amount of fuel injected or altering the spray pattern such that efficient combustion no longer takes place.
    2003 E46 320Ci Coupe
     
     

  4. The Following User Says Thank You to hontoir For This Useful Post:

    terry54661 (28-12-2011)

  5.  
    #3
    Bimmer Fan
    Car Details
    xXxStKxXx's Car Details
    Model of Car:
    325i
    Year of Manufacture:
    1993
    Transmission Type:
    man
    Car Body Type:
    saloon

    Join Date
    Apr 2009
    Location
    North London
    Posts
    8
    Thanks
    4,432
    Thanked 6,073 Times in 4,855 Posts
    If you keep your car well serviced then it should not lose any or much HP. Regular oil service will help.
     
     

  6. The Following User Says Thank You to xXxStKxXx For This Useful Post:

    terry54661 (28-12-2011)

  7. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  8.  
    #4
    BMW Maestro
    Car Details
    ckl139's Car Details
    Model of Car:
    320i Sport
    Year of Manufacture:
    2003
    Transmission Type:
    Manual
    Car Body Type:
    Saloon
    ckl139's Avatar
    Join Date
    Apr 2011
    Location
    Bedfordshire
    Posts
    754
    Thanks
    68
    Thanked 27 Times in 25 Posts
    would products like redex help? Before it gets mentioned I already use higher grade petrol in mine....
     
     

  9.  
    #5
    Bimmer Fan
    Car Details
    xXxStKxXx's Car Details
    Model of Car:
    325i
    Year of Manufacture:
    1993
    Transmission Type:
    man
    Car Body Type:
    saloon

    Join Date
    Apr 2009
    Location
    North London
    Posts
    8
    Thanks
    4,432
    Thanked 6,073 Times in 4,855 Posts
    Quote Originally Posted by ckl139 View Post
    would products like redex help? Before it gets mentioned I already use higher grade petrol in mine....
    Not really because higher grade petrols contain cleaning agents already
     
     

  10.  
    #6
    BMW Maestro
    Car Details
    hontoir's Car Details
    Model of Car:
    320Ci
    Year of Manufacture:
    2003
    Transmission Type:
    Manual
    Car Body Type:
    Coupe
    hontoir's Avatar
    Join Date
    Aug 2010
    Location
    Wales/Southampton
    Posts
    503
    Thanks
    151
    Thanked 152 Times in 129 Posts
    The problem nowadays is that the engine components are not made to last. Car manufacturers make so much money from spare parts and labour that it would not be economical for them to make a car that did not wear.
    2003 E46 320Ci Coupe
     
     

  11. The Following User Says Thank You to hontoir For This Useful Post:

    terry54661 (28-12-2011)

  12.  
    #7
    BMW Fanatic
    Car Details
    terry54661's Car Details
    Model of Car:
    323 Ci
    Year of Manufacture:
    1999 - 86000 miles
    Transmission Type:
    manual
    Car Body Type:
    Coupe
    terry54661's Avatar
    Join Date
    Sep 2011
    Location
    Milton Keynes UK
    Posts
    88
    Thanks
    63
    Thanked 21 Times in 18 Posts
    Quote Originally Posted by hontoir View Post
    The problem nowadays is that the engine components are not made to last. Car manufacturers make so much money from spare parts and labour that it would not be economical for them to make a car that did not wear.
    I see your point but how long does a car maker need the car to last! My car is 10 years old and still going strong as it has been well looked after. BMW have got a good rep with being a robust and quality made cars although people do see them as expensive to maintain.

    The engines are solid but do lose power over time due to wear on certain parts as you have pointed out.

    What other car makers produce cars that last as long as BMW's!
     
     

  13.  
    #8
    BMW Maestro
    Car Details
    Dez-Derek's Car Details
    Model of Car:
    e39 523i SE
    Year of Manufacture:
    1999
    Transmission Type:
    Automatic/Steptronic
    Car Body Type:
    Sedan/Saloon
    Dez-Derek's Avatar
    Join Date
    Nov 2011
    Location
    Portsmouth
    Posts
    648
    Thanks
    136
    Thanked 159 Times in 128 Posts
    Quote Originally Posted by terry54661 View Post
    I see your point but how long does a car maker need the car to last! My car is 10 years old and still going strong as it has been well looked after. BMW have got a good rep with being a robust and quality made cars although people do see them as expensive to maintain.

    The engines are solid but do lose power over time due to wear on certain parts as you have pointed out.

    What other car makers produce cars that last as long as BMW's!
    Mercs?

    Driven by experience and pleasure
     
     

  14.  
    #9
    Diamond BFuk Member
    Car Details
    petrolmarty's Car Details
    Model of Car:
    530d M Sport
    Year of Manufacture:
    2006 December
    Transmission Type:
    automatic
    Car Body Type:
    saloon
    petrolmarty's Avatar
    Join Date
    Sep 2010
    Location
    Essex
    Posts
    1,213
    Thanks
    140
    Thanked 438 Times in 377 Posts
    Quote Originally Posted by hontoir View Post
    The problem nowadays is that the engine components are not made to last. Car manufacturers make so much money from spare parts and labour that it would not be economical for them to make a car that did not wear.
    Not sure that's strictly true, cars nowadays are much better built. Anyone here in their 50's will remember having to decoke heads and rebuild carburettors on a regular basis. 100,000 miles was unheard of without a rebuild. Due to better build quality and engineering, plus better lubricants 250,000 is now the norm.
    All cars lose BHP due to increased tolerances but probably only 10% if looked after well.
     
     

  15.  
    #10
    BMW Maestro
    Car Details
    hontoir's Car Details
    Model of Car:
    320Ci
    Year of Manufacture:
    2003
    Transmission Type:
    Manual
    Car Body Type:
    Coupe
    hontoir's Avatar
    Join Date
    Aug 2010
    Location
    Wales/Southampton
    Posts
    503
    Thanks
    151
    Thanked 152 Times in 129 Posts
    Quote Originally Posted by petrolmarty View Post
    250,000 is now the norm.
    Possibly for BMW.
    2003 E46 320Ci Coupe
     
     

Page 1 of 3 123 LastLast
Tags for this Thread

View Tag Cloud

Posting Permissions
  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts