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Simple question about wristpin bushings

Posted by 88BB8B, Sep 28, 2020

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  1. 88BB8B

    88BB8B Proven Member

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    Hi eberybody. I've got a quick question about wristpin bushings that I'm having trouble finding an answer for.

    I know that stock dsm and evo rods have no buhing and are an interference fit between the rod and the wristpin.

    I also know that aftermarket rods come with bughins, as they are not meant to be an interference fit with the wristpin, they float in there.

    I want to fit pistons that were designed to have a pressed style rod, with rods that have bushings for a floating fit, by re-bushing the connecting rods with a bushing that is a thou or two smaller I.D than the one's the rods came with.


    My question: Can I do this (somebody told me I can, so I've already desleeved 3 of the rods.)

    Second question, should I use good ol AMPCO18? (C954) bronze bushing/bearing material, as has good shock loading properties, but is mainly used as a bearing. Or should I use some steel? Like the small end of the stock evo rods?
     

    246  1

    1995 Eagle Talon TSi AWD
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  2. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    I have never heard of this mod but I haven't been into these cars all of my life, just the last 10 yrs or so.
    My I Beams have a bronze looking bushing in them that Manley says they can replace for me, if needed. Just so you know what the big names are using.
     

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  3. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Have you compared costs of doing all of this with just buying a set of good pistons to match your good rods?
    Pistons are around $500. IDK what you would have in that set up after labor.
     

    Street Build 5K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    2K  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    888  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  14  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
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  4. bastarddsm

    bastarddsm Proven Member

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    Just have the pistons machined for circlip grooves.
     

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  5. 88BB8B

    88BB8B Proven Member

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    Coldstream, BC, Canada
    That's what I was thinking of doing (pistons machines for circlips) but I thought this would be cheaper and easier. I can probably do the machine work required for the bushings myself, but I cant do the machine work required for the pistons myself. So I'm not sure if anybody answered. Is it okay to use a bearring material for an interference fit like this? Or do you have to go the rout of machining piston grooves?

    Up in the great white norh here the dollar has taken a significant plunge. A good set of forged pistons is going to cost me close to $1000, which is just too much for me right now, so I'm pretty confident this machining will cost less.
     
    Last edited: Sep 28, 2020

    246  1

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  6. bastarddsm

    bastarddsm Proven Member

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    No, I don't not think it would be acceptible to use a bushing material for this application.
     

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  7. 88BB8B

    88BB8B Proven Member

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    I have since discovered, it seems people don't do this, I assume for good reason. Thanks for the info everybody.
     

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    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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