Lightened Gudgeon Pin

Discussion in 'Performance Mods' started by Stoneman, Apr 21, 2018.

  1. Stoneman

    Stoneman Active Member

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    lightened the pin by 4.5 grams, can’t complain about that.

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    Last edited: Apr 21, 2018
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  2. FurryOnTheInside

    FurryOnTheInside Well-Known Member

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    Nice! :cool:

    Jealous. :oops:
     
  3. Stoneman

    Stoneman Active Member

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    I’ll get a postage price if your interested? Give me some time and I’m going to see what I can take from the piston as well
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  4. FurryOnTheInside

    FurryOnTheInside Well-Known Member

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    Very interested! It's one of the very few things that can't be done on my coffee table using small/cheap tools.

    I was able to remove only 1.5 grams from inside the piston (non windowed) so I resorted to grinding the con rod (for an unknown weight reduction) to reduce the reciprocating mass. This was enough, along with the 3/8" holes in the crank cheeks, to get reasonable balance up to around. 7000rpm, but it is a bit shakey above that speed.

    You can add three of these beauties to the parcel with my two Jaguar dedigned CDIs! ;) ;)
     
    Last edited: May 22, 2018 at 3:53 AM
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  5. HeadSmess

    HeadSmess Well-Known Member

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    oh i does like a nice carbide drill... though they arent quite as impressive as watching a T-drill take out a 50mm hole at 100mm deep in a matter of seconds.

    idea with the piston...looks like theres at least a bit of meat around the bosses so you could run an endmill through, putting two flats on the side of the piston.... though looking at the clip grooves...maybe not. (on a 48 at least)

    make a split bush clamp so you can ensure concentricity, and you can bore out the back of the skirt a bit, until you meet the bosses (wife...shes a stunner!)
     
  6. jaguar

    jaguar Well-Known Member

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    You should sell them. Most everyone with a china girl engine has too much vibration. This will lessen the vibration.
     
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  7. Stoneman

    Stoneman Active Member

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    I have been, I’ve just got to work out the drill bits.
    I’m talking to the tool sharpener about it as the edges dull real quick, I’ve just hooked up a mister for cooling so I’m hoping the bits will last longer.
    The carbide bits here are quite expensive.
     
  8. jaguar

    jaguar Well-Known Member

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    Let us know the cost (including shipping) and how to pay. I assume they come from Australia.
     
  9. Stoneman

    Stoneman Active Member

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    I’m on my way to see him today with another 2 bits needing sharpening so I get get an idea what it’s actually costing me.

    Will do though and yes from Australia. . It was all thanks to your web site :)
     
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