Bore a rod end for bigger wrist pin?

[250X_project]

I was wondering if you could bore a conecting rod end 1mm for a bigger wrist pin. Let me know if anyone has tried this. Thank you!

[underpowered]

why? you would have to bore the piston as well. you risk losing structural integrity in both, causing weak spots, risking breaking them under loads.

[bwamos]

I'd have someone like falchion crank make you a custom rod.

I'd bet he's trying to use a piston off of an alternate quad for a larger bore option.

[250X_project]

Well bwamos, you would win that bet. I'm just looking over all my options, but can't find anything big enough that has a 17mm pin(besides expensive customs). Would 1/2 a mm on any end hurt the durability (even on top)?

[bwamos]

Couldn't really tell you. You could always have material added to it to reinforce it as well.

[250X_project]

I don't think I'll do that anyway, but was curious about it. Thanks for the help.

-Adam

[L.Vegas400]

if you can do it in V8 why not in a quad eng. going 1 mm bigger is only gonna be half a mm closer to the end of the rod. half a mm isnt very much.

if your putting a piston in that is so over sized that you need to mill your hole bigger then i would think you would want a stronger rod anyway. maybe the pin is oversized so you have to increase your rod too.

just my .02

[250X_project]

I like that 2 cents. Both parts make sense. I still am not sure what I'll do....

[2muchquad]

You could always do a 330 kit.I know i know you wanted to go big but nobody doesnt want to make a piston unless you buy a dozen of them.:(

[250X_project]

Yeah I've thought of that 2...I can get 4 made by JE...better than the 24 by Wiseco.:eek2: I still have a place or two to check out...Thanks 2muchquad...about how many hrs do you think you have on the top end of your 385? I know I've asked you this before, but your must be a 86.5mm right?

[bwamos]

If you wanted to go "big".. you could always take a 350x motor and bore+stroke it. ;)

[250X_project]

Yeah I have definitely thought of that one....I'm too far into this one to turn back now though...:p With just a big bore I could turn it into a 452...my friend has one we will be building for him soon anyhow. :devil:

[2muchquad]

I belive mine has a 86mm piston.Im not sure how many hours i have on it,maybe less than 10 trail rides but a bunch of runs up and down the street "testing".:)