2.5 N/A and 2.5 Turbo Bore Sizes?

Discussion in 'Modifications And Maintenance' started by Bielke55, Jan 30, 2008.

  1. Bielke55
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    Bielke55 Well-Known Member

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    How knows this or might have info on this.

    I'm thinking as a project that i wanna go with STI internals for more Boostz. But I know my stock internals are already mad at boost right now, but they are holding still.

    So i'm thinking about upgrading Pistons and Rods plus new rings and bearings... But i need to know if the Bore size is the same. To see if they will fit or not.
     
    Bielke55, Jan 30, 2008
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  2. Dynapar
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    Dynapar Well-Known Member

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    I am pretty sure that the bore is the same between the RS and the STi 2.5ls. I will do some searchign and see what i can find.

    EDIT: did a quick search. initial results are showing that both at 99.5 bore and 79 stroke
     
    Dynapar, Jan 30, 2008
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  3. 9blackmax6
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    9blackmax6 Well-Known Member

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    you might have some piston slapage going on since they're not the stock pistons and all
     
    9blackmax6, Jan 30, 2008
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  4. Bielke55
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    Bielke55 Well-Known Member

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    What? I'm thinking that i'm gonna for sure do STI pistons and Turbo rings. But we'll see. Maybe i'll save that for next year.
     
    Bielke55, Jan 30, 2008
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  5. stoooo
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    stoooo Well-Known Member

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    I suspect they're a drop in fit, according to Crawford...

    [​IMG]

    Stuart.
     
    stoooo, Jan 30, 2008
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  6. flstffxe
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    flstffxe Well-Known Member

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    yes the turbo internals will fit. how ever the rod lengths are different. the wrist pin in the turbo rods are 1.1mm lower in the piston then the na are. thus the rods in the turbo engines are 1.1mm shorter too.
     
    flstffxe, Jan 30, 2008
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  7. piddster
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    piddster Lone Wolf

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    How much can STi pistons and rods be had for?
     
    piddster, Jan 30, 2008
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  8. fourbyman
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    fourbyman Active Member

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    does anyone know if sti rods will bolt up with a phase 1 crank? its out of a 98 rs
     
    fourbyman, Jan 31, 2008
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