Dieselhead wrote:
At AMG, they may specify the exact sizes from the parts suppliers, (.001mm) or they have the parts picker matching pistons to bore ahead of time. Modern machining allows all cyl to be the same within .001mm and the same for pistons. Process control (SPC) and better machines make this possible. It is the main reason why american engines routinely go 300k miles , not 40k to 120k as in the 60s.
I thought it was partly due to better oil but mainly due to the demise of carburetors and chokes, eliminating wash down of the cylinder walls and reducing dilution of the oil. Were the first TBI small block Chevy engines (which routinely went 200k+) that much different from the 1950s versions?
OTOH, the first car I ever took to 200k had a non feedback carburetor, I drove it for quite some time with a dead choke pull-off solenoid, and it never saw a drop of synthetic oil. The engine was heavily worn by the time I drove it to the junkyard, but it still went over 1000 miles on a quart of oil. It was a very early 1980 (assembled in the spring of 1979) Chevy Citation with the 2.5 liter Iron Duke from the Pontiac Astre. The original owner worked in Detroit and lived in Lansing, so it had 145k mostly highway miles when I bought it in 1985.
Mitch. _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
