ABA block and crank ?'s

[mr.utility at highstream.net (David Utley)]

The blue finish is heat treatment...  Even if the engine was revving at 6K for 
15 minutes without oil, it would not go blue...  I have seen enough torched 
engine internals to know.  I also have never seen the blue that you refer to 
on a VW crank, but I do not doubt that they would have done this, at least on 
some...

My 0.02
-- 
Regards,
David Utley
-----------
Cable Volkswagen
405-470-3129
1-800-522-6793


Quoting Ron Pieper <rapieper@yahoo.com>:

> 
> --- "S. Coleman" <deadbolt@mindspring.com> wrote:
> > ...they have some blue-ish marks on
> > them like they were heat treated maybe.....  any ideas.   (I also wonder
> if
> > they were "heated" while the car was running?)
> 
> There should be no blue marks - that indicates excessive heat, and you can
> bet that the marks
> weren't there from the factory.
> 
> > Lastly, can someone confirm what the difference in looks (as in
> > what to look for) is between a forged crank and a cast crank.  My boss and
> I
> > are arguing that fact as well as why one is stronger than the other.
> 
> In general terms, the cast crank will have a part line that is thin.  The
> forged cranks part line
> will be thicker, maybe 1/4" or a little more.  
> 
> =====
> Cheapass Ron
> '81 Scirocco S - "Victor Jr."  7SM
> (2.0L 16V, GL 4-speed w/ Quaife installed, Megasquirt coming...)
> 
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