My personal opinion is that a NA engine of the same horsepower is more than likely to have lower lifecycle maintenance costs than a turboed machine of the same power for the simple reason is there are more things that can go wrong with a turboed engine and more parts to wear.
The operating proceedures are also different and if, for example, you don"t follow the correct shutdown proceedures you can cause the turbo to be damaged. It"s in the operator"s manual but I wonder how many people read that and follow it.
I recently bought a turboed machine and went down to NM from MT to pick it up. How many people know that when you trailer a machine with a turbo for any significant distance, you need to block the exhaust exit to keep the turbo from windmilling without lubrication?
I think there is a place for turboed machines where power to weight ratio is important.
Tractors don"t fit that requirement. Turbo"s are a cheap way to increase horsepower for a given engine size (displacment) but you have to engineer the whole machine for the increases loads and temperatures that boosting causes. This allows you to cheaply derate the engine for the lower power application or you can put different components in the derated engine if that"s cheaper. I think lower manufacturing cost is what drives the OEM"s to turbo"s. That"s why the manufacturers use them so extensively; it cheaper for them and can keep their initial cost low and thus price their machine more competively.
Opinions are like belly buttons; everybody has one. This is mine on this subject for whatever it"s worth.
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