match weighing pistons

[radish]

HI

I have just weighed my pistons and the difference is 0.3g. I have also matched the pins, clips and rings and as a complete unit i can get them all within 0.4g.
it is the 1 of the pins that is where the difference is 1.5g, Is it advisable to remove material from the ID of the pin?

Cheers

[Piledriver]

Yes.

[radish]

Thanks very much.

[Ol'fogasaurus]

I think "where is also in the picture too. In the wrong place you could have problems. I remember hearing this being a problem years ago and I think things haven't changed that much.

[radish]

I think "where is also in the picture too. In the wrong place you could have problems. I remember hearing this being a problem years ago and I think things haven't changed that much.

I would of thought through the hole at each end so it's equal?
I am confused that the total mass I can get equal but would still need to do the pin.

[Piledriver]

Sometimes there is a bit of flash in the middle you can smooth out, but the weight needs to come off the ends.

[Ol'fogasaurus]

Thank you Pile. I still have my "think about it" habit from being a "checker/mentor" of others work for over 30 years. I point out something and if they find the answer themselves they are more apt to remember it than if I give them the answer. Sorry!

[Ol'fogasaurus]

I did a quick search on balancing and got a great answer from Eaton:

http://www.eatonbalancing.com/blog/2007 ... ng-part-3/

Here are some more I found. There is a lot of info, including videos, depending on how you word the search:

http://aircooledtech.com/balancing/

viewtopic.php?t=124244

http://aircooledtech.com/balancing/

http://www.shoptalkforums.com/viewtopic.php?t=42324

Also remember that taking weight from the wrong place can weaken the piston catastrophically.

[radish]

Thanks, that info at Eaton is great.

[radish]

Crisis over, I re weighed on 2 different scales today and the original weights were incorrect! Now I'm lucky enough to have access to a laboratory with plenty of weighing equipment not £15 kitchen scales but these cost between £700-2500. So all good now.
Thanks for your help.