It's kind of an apples and oranges comparison for either, if designed properly. Often, when a company takes an existing NA engine, and puts a turbo on it, they beef it up along the way. Lower compression pistons - that might be a anodized and use plasma Keystone rings, bigger piston pins, piston-skirt oil cooling, stronger rods, bigger cooling system, etc. If done right, one can last just as long a the other. Turbo version does more work and is built to endure it. In fact, sometimes the turbo versions last longer because they don't suffer from being overheated and overfueled, and lugged, resulting in cracked heads. That is very common in some non-turbo automtotive diesels.
Now, is a NA cheaper? Well yeah, usually since it costs less to build. But many times a smaller turbo engine takes the place of a larger NA engine - so that cuts down somewhat on the price difference.
Less things to wrong? One less turbo on the NA, that's all (for many systems), and turbos can last a very long time.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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