The difficulty is that the tuning game becomes very expensive once it has started.
To maintain that perfectly tuned engine you have to have the engine dynamically balanced at least at every service, because some of the parts will have been changed.
All the components will need machining, because dynamic balancing requires that the parts meet an exact weight (so it is additive as well as subtractive engineering)as well as an exact size.
Once a part can be machined, then substitution will take place. There are things one can do to a liner that make it 'better',
and the class becomes the playground of the very rich who can run an engine absolutely on its last bore, with the ports so close to the fiche that gas erosion will take them over the limit after a couple of meetings and so on.
Let's not forget the roots of the class, as a class where 'off the shelf' means that there is no advantage.
Let's face it,the suggestion of returning to the days of unlimited tuning, means the sport part has already been forgotten Basically, playing "wallet" in an 'economy' class isn't being sporting. There are wallet classes for wallet players, TKM is not meant to be one of them.
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