On Thu, 22 Aug 1996, David Littlefield wrote:
> Generally, the term refers to the practice of bringing the clearances in
> the engine to tolerances better than the factory could or would.
> As far as I know, this applies in one form or another to virtually every
> place in the engine where one moving part touches another.
<snip..>
Good description of what constitutes blueprinting. Another
technique that is popular is 'indexing' the crankshaft.
When I dropped my engine bits off at the machine shop, the
machinist asked me about a squillion questions: Hottank?
Shotpeen? Nitriding? Knife-edge? Align-bore? I was doing
fine, until me asked if I wanted the crank 'indexed' when
they reground it.
:-? "Ummm.. err, Yes, I want it indexed..."
The 50ish machinist looked at me, knew I had no earthly idea what
'indexing' was, and paraded me into the shop like an errant child
where he explained the technique: regrinding the crank ensures the
rod and main journal clearances are all brought back to spec (or
better). Indexing takes that a step farther and ensures that the
stroke of each rod journal is the exact same length.
I trusted this shop, however I learned a valuable lesson that
day; if you dont understand, swallow your pride and *ask*.
--Scott
Scott Hower --> howersl@ttown.apci.com
Air Products & Chemicals, Inc.
7201 Hamilton Blvd Trexlertown, PA
(610) 481-2646
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