18 -> 20 mm gudgeon?

Chickenman · Post by **Chickenman** » Wed Apr 25, 2007 8:22 pm

Can a piston with an 18mm gudgeon be taken out 2 mm and still maintain it's structural integrity?

Got some ACL pistons for bluetop today and don't quite know what I'm going to do with them :lol:

Post by **Mr Revhead** » Wed Apr 25, 2007 8:53 pm

lol u should be able to get them machined
best ask engine builders about it

Chickenman · Post by **Chickenman** » Wed Apr 25, 2007 8:56 pm

I'm just asking if it's a good idea or not :?:

Post by **Mr Revhead** » Wed Apr 25, 2007 9:12 pm

if the construction of the piston allows it, then yeah why not
if they suit your needs

i think the tricky bit could be the circlips

Chickenman · Post by **Chickenman** » Wed Apr 25, 2007 10:11 pm

I think I'll buy a bluetop :idea:

Bling · Post by **Bling** » Wed Apr 25, 2007 10:47 pm

you can buy my bluetop :wink:

atmosports · Post by **atmosports** » Thu Apr 26, 2007 8:12 pm

Either Circlips or Spiralocs should be easy to get for 20mm gudgeons. Machining for them is easy if your used to machining pistons & isn't really any harder to do than any other circlip or internal groove.

Post by **Mr Revhead** » Fri Apr 27, 2007 8:48 am

there ya go chook.... send em north :twisted:

Chickenman · Post by **Chickenman** » Fri Apr 27, 2007 9:04 am

I don't think it's worth it at the end of the day. Will just keep them hanging around until I find a use for them.

atmosports · Post by **atmosports** » Fri Apr 27, 2007 8:45 pm

There are plenty of competent people in the South Island around Christchurch/Timaru that could do them for you I'm sure, if there is enough meat round them. I haven't got this exact set sitting in front of me to know & I'd rather try & persuade someone to buy a decent set of pistons like a set of CP's than machine something to do the job as I have seen some JE's fail through the gudgeon boss under heaps of boost & it wasn't a pretty sight.

If you get stuck for circlips/lock try Proturn Engineering(Dick Chapman used to be LR Race components) or Denco(Bob Benson) both manufacture pistons & have done so for many years & had a pretty good selection or will be able to point you in the right direction. Else I have had luck with Sydenham Park(Silvesters), Kelfords,Segedins etc as well in trying to source enough for one piston or odd sizes.