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Thread: Help prop conversion on rb20det

  1. #1
    Guest mospin's Avatar
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    Help prop conversion on rb20det

    Can any one shed some light I've put in a rb20det gtst long block version not the short block into my 180sx with rb20 bellhousing and ca18det box .

    I'm having trouble with the prop fitting I've tried both types off front props 52cm and 54cm and nether fit

    Can someone shed some light on this

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    Last edited by mospin; 20-07-2018 at 00:33.

  2. #2
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    Measure the front housing lengths.

    Engine may be in slightly different place, measure from bulkhead to back of engine.

    Then you need someone to measure bulkhead to back of engine on stock car.

  3. #3
    Guest mospin's Avatar
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    I'm using r32 subframe so engine has been brought forward.

    The rb bell housing is a inch longer than the ca bell housing .

    So I'm a inch to long on the prop

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  4. #4
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    how is your gearbox input shaft reaching your engine if the belhousing is longer?

  5. #5
    Guest mospin's Avatar
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    I've no idea it slotted in the spigot bush fine I'm gonna measure the bell housing again against the ca

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  6. #6
    Guest mospin's Avatar
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    So

    Rb bellhousing 14"
    Ca bell housing 14"
    Ca box is 20"
    Rb box is ?
    Rb box with ca housing 34"

    Front prop is 20.472"

    Can someone measure a rb20 box with out bellhousing please

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    Last edited by mospin; 20-07-2018 at 10:55.

  7. #7
    Guest mospin's Avatar
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    Update just been told rb housing on ca box is too long I need a rb20 box to make it work

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  8. #8
    Dorset & Hants Rep pointz's Avatar
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    Aren't you meant to use a r33 subframe?

  9. #9
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    you only use the 33 subframe for rb25 swaps

    I knew the rb20 box is nonger than CA and SR boxes but didn't know where they added the extra length.

  10. #10
    Dorset & Hants Rep pointz's Avatar
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    Quote Originally Posted by green_rs13 View Post
    you only use the 33 subframe for rb25 swaps

    I knew the rb20 box is nonger than CA and SR boxes but didn't know where they added the extra length.
    Knew you had to for 25 so assumed you would for a 20 now I know

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  11. #11
    Guest mospin's Avatar
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    Slight update as I can't find a rb20 box I'm having a custom prop made which will be with me friday will see if that works and update

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