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Thread: M50 Non-Vanos Block vs Vanos

  1. 10-21-2011, 09:03 PM #1
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    M50 Non-Vanos Block vs Vanos

    Asking here because it refers to my build and you guys are the smart ones.

    What I am wondering is if the Non-Vanos M50 block is the same as the vanos ones?

    I am looking to start with a smaller bore block and bore it out so it has fresh round cylinder walls as my S50 has 250,000 miles and I'm sure they are decently ovalized. It would really help me get a move on my winter build as I have a Non-Vanos trash motor just sitting here.
    -Critter

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  2. 10-21-2011, 09:52 PM #2
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    Yes the m50nv and the m50tu blocks are the same.
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  3. 10-21-2011, 11:54 PM #3
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    I have an M50 TU head on my M50 NV block.. so yes.. same.
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  4. 10-22-2011, 02:44 AM #4
    thorburnville is offline Member
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    While your on the topic are b20 blocks the same as b25? other then the bore of course
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  5. 10-22-2011, 03:22 PM #5
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    Quote Originally Posted by thorburnville View Post
    While your on the topic are b20 blocks the same as b25? other then the bore of course

    AFAIK that would be correct, because I know you can take the B20 crank and put it in any other M50 to destroke to a 66mm stroke. All M20/M50 engines have the same bore spacing.
    -Critter

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  6. 10-22-2011, 09:43 PM #6
    Xenocide is offline Member BMW CCA Member
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  7. 10-23-2011, 03:56 PM #7
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    sorry for the slightly OT , but can a non vanos head be made into a vanos head by adding the the front vanos unit? and cams obviously
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  8. 10-23-2011, 03:56 PM #8
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    dbl post
    Last edited by das Boot; 10-23-2011 at 04:02 PM.
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  9. 10-23-2011, 04:01 PM #9
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  10. 10-23-2011, 06:38 PM #10
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    Yes you can put vanos on a nv head but it requires a little work to make it fit.
    The head needs to be shaved slightly where the vanos solenoid sits and also the lower lip on the front cover flange.

    You would also need to modify the cam sensor slightly by cutting off the plastic ridge on the sensor by the base.

    You have to use a vanos cam sensor too. And obviously vanos cams.
    Last edited by jlaudio982; 10-23-2011 at 06:39 PM.
    ]
    493whp/453wtq GT3076r @ 20psi on 93 pump
    NV crank, Eagle H beams, 8.5:1 CP pistons, NV head w/vanos, S52 camshaft
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  11. 10-23-2011, 11:05 PM #11
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    cool thanks.
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  12. 10-24-2011, 08:06 PM #12
    Orac is offline Member
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    Vanos engines also have smaller valve stem diamters, lighter valves and beehive springs, which the vanos do not have.
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  13. 10-24-2011, 08:15 PM #13
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    Yes non vanos has 7mm valve stems and dual valve springs.
    ]
    493whp/453wtq GT3076r @ 20psi on 93 pump
    NV crank, Eagle H beams, 8.5:1 CP pistons, NV head w/vanos, S52 camshaft
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  14. 10-25-2011, 08:41 AM #14
    rochey6957 is offline Member
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    So non-vanos is better for boosting?
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  15. 10-25-2011, 08:51 AM #15
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    Quote Originally Posted by rochey6957 View Post
    So non-vanos is better for boosting?
    No
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