You've covered the difference in your message. You used the key word..... TOLERANCES!
Think what that means.... it means.... things that are allowed either side of 'perfect'. Outside these 'tolerances' components get rejected. That still contains the concept that ALL the components are different, even if Honda make a good attempt at 'accuarcy'.
You have to remember the 'accuracy' (closeness to the 'perfect' size/shape) required for 'pump' engines is not exactly in the range that would be required for Racing engines, Military jets, Missle compnents nor stuff for CERN or NASA.....
For ease of reference, let's pretend that 'bigger' is better (obviously it is NOT but, you'll see the point).
If you have 100 components 'made to tolerance', 1 out of those is going to be the 'biggest' and thus the 'best'. The rest will be, therefore 'inferior'. If you then take ALL the engine parts and select the 'biggest' from each of those, you are starting to make a difference to the final engine..... The nasty twist is that the engines made up from the parts that have been REJECTED will ALWAYS be less than 'optimal' and the ones made of the 'smallest' components of the 100 will be PATHETIC!
And that's how it works.
Obviously, we need to replace 'biggest' with 'best' but it's much harder to explain using that word.
Ian
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