Originally posted by Klox
Jon,
I presume that i would go align boring when wear is a problem, but sometimes honing would be sufficient.... I'm no automotive engineer. Would you be so kind to elaborate on pros & cons of honing vs boring?
Klox |
Hi Klox,
I took sometime this afternoon to call and talk with BHJ
Products who make tools and fixtures for automotive
machinists. Because the subject of align boring and align
honing is not properly covered in the five books I presently
have on automotive engine machining, I felt I needed to do
this. The books I own all deal with the small block Chevy V8.
http://www.bhjinc.com
What most people now do is align hone the main journals as a
first step. In the past they use to align bore them. The
problem is that most shops don't go the extra step and align
bore and align hone the camshaft tunnel to make sure the
camshaft tunnel is square and parallel with the mains. BHJ
makes a very expensive fixture that does allow one to do
this on a Bridgeport type mill.
As far as your question goes, align honing allows, from what
I read in Smokey Yunick's Power Secrets book, a higher crush
on the bearings which in turn allows more heat to be carried
away from the back of the bearing to the main webs of the
cylinder block.
I have been doing a tremendous amount of reading in order to
really understand performance racing engines and it took
a call to BHJ to realize that none of the books that I have
give the subject adequate coverage. The books I have also
do not have much to say about cam roller bearings, just cam babbitt bearings.
jon