Dave Blackhurst |
July 21st, 2008 04:09 AM |
A couple of things -tolerances, meaning that the individual components can have a slight variation, as well as a tolerance in any adjustable internal settings.
On top of that add that as components age, there is some drift and things can slowly go out of alignment...
Finally, to add another layer of complexity, most modern cams have heavy reliance on firmware, which can be "upgraded", as can design specifications over the course of a production run...
I find that two cams purchased around the same time from the same vendor typically will be pretty close. I saw a wide variation in output between the HC7 and the CX7, even though the guts were supposedly nearly identical - the HC9 was more like the CX7, but still slightly different... again, the HC9 was just an updated HC7...
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