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Thread: Engine Loosening up?

  1. #1
    Regular Member denzo's Avatar
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    Default Engine Loosening up?

    Can someone please explain what Engine 'Loosening' actually means? what really happens, how can you tell it has happened?

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    Regular Member Harry's Avatar
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    i may be wrong here but is this similar to the engine having been "run in", but only over a longer period than 500 odd miles which i think is the recommended time to drive the car conservatively.

    i imagine its when all the parts have bedded in.

    i'll probably be corrected soon enough so you may not want to pay much attention to this post!

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    had a cav v6 rebuilt and i took 500 miles to run it in or "loosen up". There is a massive difference to how the engine "feels" when driving it. To start with the engine didnt't seem to be happy to rev freely, but this steadily got better as miles came on i.e. looser. as posted above all the machined parts are never perfect an so need to safely rub against each other to form the same shape i.e. crank against bearings, piston rings against bores etc. after an oil change and another 500 miles and another oil change the engine can be "thrashed" without fear of it breaking. This should be done in the factory for a new car, so as far as loosening up is concerned for a new car you wont really feel a great deal, but after say 10,000 miles it will be easier and revvier to drive, but you may not notice. Also, the worst way to run an engine in is constant revs, say on a motorway. the best - town driving going up and down the rev range. hope this helps

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    Regular Member Harry's Avatar
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    hmmm...i've always thought that motorway miles are the "healthiest" miles a car could do??

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    Ex Vec-C Admin / Founder Duncan's Avatar
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    Quote Originally Posted by denzo
    Can someone please explain what Engine 'Loosening' actually means? what really happens, how can you tell it has happened?
    When it falls out onto the road!!!

    On a serious note, polisher has really answered the question. It's when engine parts have settled in and run smoothly against each other.

    D

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    Thumbs up

    hi guys, just to clarify my previous post

    motorway miles are great for a car thats been run in as the constant speed minimises wear, but to loosen an engine, it needs to wear to smooth the bits and peices together.

    hope i've clarified a little

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