<VV> Early drums from Z car

[HallGrenn at aol.com]

In a message dated 11/5/2008 3:31:43 P.M. Eastern Standard Time,  
lechevrier at earthlink.net writes:

maybe  "absorb" heat would have been a better description, followed by  
"dissipate" heat -- both cast iron and aluminum are good at it, as can  
be noted by looking at the frying pans on your stove.

Now, by my  limited understanding of 'big rig' truck brakes (one 
emergency wheel  bearing job and routine service on one or two tractors), 
they would prefer  to have the extra metal rather than turn a really ugly 
surface heat  cracked drum, so loss of material may be one of the 
considerations on drum  turning limits, as it is on disc brakes.

Bill  Strickland



To quote from page 5-13 of the '65 manual "A brake drum must not be rebored  
more than.060" over the maximum standard diameter, since removal of more metal 
 will effect (sic) dissipation of heat and may cause distortion of the  drum."
 
The other point is that the steel drum has a softer iron "lining" that the  
shoes brake against.  This is the part that must be of a minimum thickness  to 
accept the heat and pressure of the brake linings (shoes).   Theoretically, if 
you don't distort the steel drum your could "reline" them with  more iron 
from time to time--totally impractical, but possible.
 
Bob Hall
Group Corvair
Washington DC suburbs
**************AOL Search: Your one stop for directions, recipes and all other 
Holiday needs. Search Now. 
(http://pr.atwola.com/promoclk/100000075x1212792382x1200798498/aol?redir=http://searchblog.aol.com/2008/11/04/happy-holidays-from
-aol-search/?ncid=emlcntussear00000001)