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Thread: Wheel Nut Sheared - Advice

  1. #51
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,336
    I was given a set of 17 mm across the flats wheel bolts but still using my original 15 mm bolts. Less weight hence faster acceleration.
    Drives a Smart Cdi - 65 to 85 MPG

  2. #52
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,395
    Quote Originally Posted by tolsen View Post
    I was given a set of 17 mm across the flats wheel bolts but still using my original 15 mm bolts. Less weight hence faster acceleration.
    Yes, I can see where that would be necessary with a CDI.

  3. #53
    Join Date
    Feb 2011
    Location
    Lewes
    Posts
    722
    Tolsen, have you removed all the unnecessary plastics from your car to save weight for your faster acceleration? I doubt you would be able to show, even under test lab conditions, the improvement in acceleration from just changing the 15mm bolts for 17mm bolts.
    It certainly wouldn't make any difference to the acceleration times for your CDI when it has 50KG of cement in the back and a trailer with a boat on it! Lol.

    Still, each to their own!

    John

  4. #54
    Join Date
    Nov 2007
    Location
    BANCHORY
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    3,336
    There is a considerable difference in wheel bolt mass. Lighter wheel bolts hence lower unsprung mass improves traction and handling.
    Drives a Smart Cdi - 65 to 85 MPG

  5. #55
    Join Date
    Nov 2007
    Location
    BANCHORY
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    A 17 mm wheelbolt weighs 70 grams.
    An original Smart hollow head 15 mm wheelbolt weighs 50 grams.
    Total weight saving per wheel becomes thus: A massive 60 grams since, as you all will know, there are three wheel bolts per wheel.
    Drives a Smart Cdi - 65 to 85 MPG

  6. #56
    Join Date
    Jan 2011
    Location
    uk
    Posts
    882
    Quote Originally Posted by tolsen View Post
    A 17 mm wheelbolt weighs 70 grams.
    An original Smart hollow head 15 mm wheelbolt weighs 50 grams.
    Total weight saving per wheel becomes thus: A massive 60 grams since, as you all will know, there are three wheel bolts per wheel.
    Going from 15 to 17mm bolts means youíre changing the moment of inertia (solely of the bolts per car)
    from 0.001896 kg.m^2 to 0.002652 kg.m^2

    Itís going to make a huge difference
    You're so money supermarket and you don't even know it!

  7. #57
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,336
    Hence with my now rather rusty and much lighter wheelbolts Iíll be miles ahead of Heinkel in an acceleration test.
    Drives a Smart Cdi - 65 to 85 MPG

  8. #58
    Join Date
    Dec 2007
    Location
    London
    Posts
    405
    I used the seized wheel nuts as an excuse to buy a compressor and some air tools

    Unfortunately I have found out the hard ward that the CFM rating on the compressor bears no relation to the CFM rating on the tool you want to use

    I have since been advised that the compressor rating needs to be roughly 6 times higher than that required by the tool

    Thankfully I only spent £70 on the Aldi branded Workzone unit, so not a disaster, but disappointing all the same

    https://www.aldi.co.uk/workzone-2-5-...85433223920500

    https://www.alibaba.com/product-deta...683496875.html
    Paul
    Pure 2000 W, LHD 599cc - Engine Rebuilt Feb 08 - sold
    Passion 2000 W, LHD 599cc - Engine Rebuilt Mar 09 - sold
    Passion 1998 T, LHD 599cc - Engine Rebuilt Apr 10 - sold
    Cabrio 2001 Y, LHD 599cc - Engine Rebuilt Jul 10 Replaced Oct 16

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