<VV> line/align boring cases

[JVHRoberts at aol.com]

Typically, a good line boring setup does, in fact, support the bar at both  
ends. Even for something as small as the cam bearing bores. 
 
I've wondered about the mains as well, as I have split many cases where's  
it's obvious the two case halves have been 'walking', especially in turbo  
motors. As in the machining marks are GONE, and the surfaces have a matte  finish, 
like they've been lapped together. 
 
In a message dated 2/11/2006 10:52:26 A.M. Eastern Standard Time,  
djtcz at comcast.net writes:

When  factories machine block these days the smaller holes are finished with 
boring  bars that pass thru ruff starting holes to the far end, where they are 
well  supported at the far end by a precise fixture before the cutting tool 
creates  a single chip. I shudder at the prospect of being faced with trying to 
bore a  string of tiny holes starting at one end, and having the final hole 
end up  close to the original position.  Line/align  honing stands a much  
better chance of preserving the factory alignment (good, or bad).

Do  the main bearing bores survive distortion free to the mileage the cam 
bores  are worn oval ?

If the cam bore wear is big all around, cutting the  case faces will not 
reduce the vertical dimension much. ().

--
Dan  Timberlake