Quote:
Originally Posted by PsyDoc
I'd bet the numbers posted by GM have a certain percentage of error associated with them as no engine is absolutely identical to another...there will always be very slight differences in manufacturing and assembly that...when they combine...exceed GM's numbers or fail to meet them.
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In engineering, one runs what is called a monte carlo analysis. You caculate all tolerances and look for best and worst case, then design for the center of that range. That way, if tolerances stack up against you, you still fall within acceptable range.