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Thread: 451 cdi (2)

  1. #11
    Join Date
    Jan 2015
    Location
    Devon
    Posts
    35
    Quote Originally Posted by Mjolinor View Post
    That boost cannot be right? I was thinking it should be maybe 12 at the minimum and that is more like 5.
    Not right at all, you virtually have a normally aspirated diesel so no wonder it's a slug. I don't know the exact figure for the 451, but it's around 18psi above atmospheric on the 450.

    Have you read the page on Evilution regarding boost pressure issues on the CDi?

  2. #12
    Join Date
    Nov 2007
    Location
    BANCHORY
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    3,031
    I think same turbo and boost pressure as the 450 Cdi.
    Drives a Smart Cdi - 65 to 85 MPG

  3. #13
    Join Date
    Nov 2007
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    Quote Originally Posted by Mjolinor View Post
    The turbo arrangement on my 450 and on the Euro4 CDI is the same and the wastegate arm is on the bottom, easily accessible form underneath the car. In order to operate the wastegate manually with the engine stopped I always needed mole grips, it was quite hard to move. On this Euro5 CDI the wastegate is on top of the turbo though you can still reach it OK with the cross beams removed and I can easily move it with my fingers. Is this normal?
    They are all on top.

    My 450 Cdi turbo:


    451 Cdi engines:



    Note provision for manual hand crank start. This mine does not have. Obviously the 451 Cdi is less reliable.
    Drives a Smart Cdi - 65 to 85 MPG

  4. #14
    Join Date
    Nov 2007
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    3,031
    Waste gate is spring preloaded by spring inside actuator. Impossible to move waste gate arm with fingers.
    Drives a Smart Cdi - 65 to 85 MPG

  5. #15
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,159
    Quote Originally Posted by tolsen View Post
    Waste gate is spring preloaded by spring inside actuator. Impossible to move waste gate arm with fingers.
    Well for sure I can easily move mine so it seems maybe a fault there.

    Any suggestions? It is bloody awful to get at.

  6. #16
    Join Date
    Nov 2007
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    Just remove rear panels and bumper. A five minute job on mine.
    Drives a Smart Cdi - 65 to 85 MPG

  7. #17
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,159
    Quote Originally Posted by tolsen View Post
    Just remove rear panels and bumper. A five minute job on mine.
    Yup, but not on a 451 it aint.

  8. #18
    Join Date
    Nov 2007
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    BANCHORY
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    Quote Originally Posted by Mjolinor View Post
    Yup, but not on a 451 it aint.
    The 451 is not designed for ease of maintenance. A few more screws, nuts, clips, electrical connectors and a door but nothing beyond your capabilities
    Drives a Smart Cdi - 65 to 85 MPG

  9. #19
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,159
    Quote Originally Posted by tolsen View Post
    The 451 is not designed for ease of maintenance. A few more screws, nuts, clips, electrical connectors and a door but nothing beyond your capabilities
    Aint that the truth. If I could find a 450 diesel with the steering wheel on the correct side I wouldn't have bothered with a 451 at all and I am beginning to think I should just get shut of both these and get a 450 petrol again, as new as is possible then stick an LPG conversion on it.

  10. #20
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,159
    Just looking at your picture. The actuator pulls in (gets shorter) to open the wastegate, is that correct? Or, the actuator pushes (gets longer) to open the wastegate? ie Is the wastegate fully anticlockwise when closed or vice versa?

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