Thread: New vibration
View Single Post
Old 11-05-2013, 03:36 PM   #7
J and M Machine
Senior Member
 
Join Date: Oct 2010
Location: 40 Mt.Vickery Rd. Southborough,MA 508-460-0733
Posts: 352
Default Re: New vibration

Quote:
Originally Posted by Peter J View Post
I was sort of afraid that would be the answer. I'm suprised that their would be enough weight variance to set up a vibration with all new parts. Oh well, a winter project.
Pete
Actually you'll be quite surprised as sometimes a set of pistons is out the window in regard to balance. Same goes for rods can't assume anything unless they say balanced then still don't believe it.
You'll notice in the photos above that pistons are out 6.6 grams.
This weight is out of the box and juggled wrist pins to get the best weight before metal removal.
Sometimes they're really good and then really bad.

Rods we try to keep them together as sets but lately alot of the threads are being damaged by people unknowingly overtightening the nuts.
We have to weight match the rods best we can before we even can pour them. To make the balancing work easier.
www.jandm-machine.com
Attached Images
File Type: jpg IMG_7187.JPG (62.5 KB, 67 views)
File Type: jpg IMG_7189.JPG (60.6 KB, 64 views)
File Type: jpg IMG_6935.JPG (65.4 KB, 65 views)
J and M Machine is offline   Reply With Quote