Posted by Spook on November 26, 2014 at 06:52:17 from (99.108.197.221):
In Reply to: OT--gasoline engines posted by Jiles on November 25, 2014 at 20:34:40:
I spent 35 years building engines at GM. I did programming and setup on gages, and worked as a supervisor at a dyno facility, among other things.
Matierals have changed comepletely over the years. Todays bore liner is made out of powdered metal, as are most rods, and some camshafts. Most crankshafts are now forged. The powdered metal parts are very tough, almost like a carbide, they resist wear very well, and are hard all the way thru, not just surface hardened like many steel parts.
Tolerances: Engine parts today are made to incredible tolerances. A crankshaft that might have had a diameter vtolerance of +/- .0015 (+/- .037 mm ) might have a tolerance of +/- .001 mm today, a reduction of over 90%.
In house repairs: When I started, every production area had repair loops, to fix things that had not been done right the first time. In the mid 90's, these all got torn out and scrapped. No repairs are allowed. If a engine isn't perfect, it gets thrown in the scrap bin. If things aren't right, production stops in a hurry. Nothing is made until things are 100% right. This drove warranty down to almost nothing.
Fuel injection: Big improvement, no fuel washing the lube out of the cylinder walls, contaminating the oil.
There are probably things I don't know about, or can't remember, but this what I can think of, right now.
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