Turboing the M54B30 engine ??

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  1. Turboing the M54B30 engine ?? 
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    HI ALL
    I have an M50b25 non vanos engine in witch I dropped in an M54B30 crank and rods ( bore 84 stroke 89.6 ) That turns the motor to a 3 liter . I would like also turbo this unit so I think that the standard m54 pistons are not siutable because they are not forged and have a compresion ratio of 10.2 :1. I would like to go for 8.5 cr. According to my calculations I can drop the cr to 9.5 with a 3mm mls head gasket , but still to high .
    Any ideas !?!?
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    Have any one done this before ??
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    Quote Originally Posted by emvin View Post
    HI ALL
    I have an M50b25 non vanos engine in witch I dropped in an M54B30 crank and rods ( bore 84 stroke 89.6 ) That turns the motor to a 3 liter . I would like also turbo this unit so I think that the standard m54 pistons are not siutable because they are not forged and have a compresion ratio of 10.2 :1. I would like to go for 8.5 cr. According to my calculations I can drop the cr to 9.5 with a 3mm mls head gasket , but still to high .
    Any ideas !?!?
    I would suggest you get some custom low compression pistons made by JE. It will lower the CR to the exact level you want (say 8.5:1) and they are much more resiliant to boost and detonation if you had a bad tune for any reason.

    Though you could always get some stock pistons machined to lower the compression ratio, but it would require some calculating to work out the dish needed and so on.
     
     

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    I have heard lot about JE piston . The look like a very good quality,aren't they ? . I think best thing to do is to send all the dimensions possible inclouding combastion camber capacity to JP and let them decide what kind of piston is siutable for my needs .
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    Quote Originally Posted by emvin View Post
    I have heard lot about JE piston . The look like a very good quality,aren't they ? . I think best thing to do is to send all the dimensions possible inclouding combastion camber capacity to JP and let them decide what kind of piston is siutable for my needs .
    I dont think they will calculate the piston size for you.
    They only make to a specific specification. But it is worth asking them.

    I would consider getting your existing pistons machined for a lower CR but it depends what turbo you are going to use and what boost?

    JE pistons are very good quality.
    I would avoid CP ones.
    Mahle are very good also but I dont know if they do custom pistons
     
     

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    My original m54 pistons are Mahle but they are too tin to be machined!(at the center ). They can just be machined only with two small bowles one on each side on the gudging pin. This will drop the cr just by 0.3, having total cr of 9.2:1. But think it's enough for 10 psi boost!.
    Last edited by emvin; 14-12-2008 at 15:53.
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    Quote Originally Posted by Boostist View Post
    I dont think they will calculate the piston size for you.
    They only make to a specific specification. But it is worth asking them.

    I would consider getting your existing pistons machined for a lower CR but it depends what turbo you are going to use and what boost?

    JE pistons are very good quality.
    I would avoid CP ones.
    Mahle are very good also but I dont know if they do custom pistons

    What's wrong with CP ?. I'm asking this just because I found out that cp allready have the piston I am looking for off the shelf (m54 forged 8.5 compresion ratio)
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    Why not supercharge it !!
     
     

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    Turbo gives you much more fun!!
    And that wossss sound !!!!
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    Quote Originally Posted by emvin View Post
    What's wrong with CP ?. I'm asking this just because I found out that cp allready have the piston I am looking for off the shelf (m54 forged 8.5 compresion ratio)
    I have heard some professional engine builders I know talk badly of CP.
    I have no experience of them myself but if they have them on the shelf, I may risk it !
     
     

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