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Thread: Piston-to-bore clearance?

  1. #1
    Join Date
    May 2016
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    Stroud
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    1

    Piston-to-bore clearance?

    Hello all,

    I'm having my 599cc block machined to take oversize pistons.
    Does anyone know the piston-to-bore clearance specification for these engines?

    When I rebuild an engine, I get the bores machined to match the actual pistons that I have.
    It's good practice to do this (Machining the bore to give a specific piston to bore clearance, rather than machining the bore to a set size and hope that the piston is perfect.)
    It's an old habit that I bring from my experience rebuilding engines from a much older era, but I rather do it this way.

    Does anyone know what the spec is?

    Thanks,

    Mike.

  2. #2
    Join Date
    Apr 2009
    Location
    Ecosse
    Posts
    3,708
    I didn't know oversize pistons were available. Are they genuine Mercedes/smart or pattern? If the former, maybe the info you need is on one of the MB bulletin/worksheets - others on this forum are better at accessing then the I am (WIS system?).
    If the latter, I'm guessing you are on your own. By the sounds, you have enough experience to arrive at a suitable clearance. Worth remembering that it is a turbocharged engine with greater thermal stresses and that a touch more clearance may be required?

  3. #3
    Join Date
    Jan 2011
    Location
    uk
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    904
    Quote Originally Posted by pinger View Post
    I didn't know oversize pistons were available.
    Yep, been available for years
    https://www.smarttune.co.uk/product....ortwo-up-to-07
    You're so money supermarket and you don't even know it!

  4. #4
    Join Date
    Apr 2009
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    Ecosse
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    Quote Originally Posted by reinaldo_is_spam View Post
    And for 700s too. Everyday's a schoolday - cheers!

  5. #5
    Join Date
    Nov 2007
    Location
    BANCHORY
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    3,362
    Bloody expensive those pistons so lucky these engines have only three cylinders.
    Drives a Smart Cdi - 65 to 85 MPG

  6. #6
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,398
    It's all relative. I recently searched for some for a 3 cylinder Gardner.

    That's the same price as 3 X 450 smart cars for a set.

  7. #7
    Join Date
    Jan 2015
    Location
    Devon
    Posts
    79
    That is crazy money for new pistons. You can get top quality Kolbenschmidt pistons (OE for many car manufacturers) for around half that, and Freccia or Nural pistons for around 30 if you shop around.

  8. #8
    Join Date
    Jan 2011
    Location
    uk
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    904
    Quote Originally Posted by mikerj View Post
    That is crazy money for new pistons. You can get top quality Kolbenschmidt pistons (OE for many car manufacturers) for around half that, and Freccia or Nural pistons for around 30 if you shop around.
    Agreed - you can pay from 29.95 for IPSA up to over the smart tune price 112 for a trucktec
    https://www.autodoc.co.uk/car-parts/...07-0-7-452-334
    Last edited by reinaldo_is_spam; 20-01-2020 at 08:38 PM.
    You're so money supermarket and you don't even know it!

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