Quote Originally Posted by martion007 View Post
I figure it like this, (My opinion only) An automotive engine is alot more reliable than any certifyed aircraft engine because millions more have been spent on designing them.
There is no correlation between the amount of money spent on something and how good of a product it is. Good products are developed with little money, and bad products are developed with lots of money, and yes, sometimes the reverse is true. An auto engine is designed to live a long time by being run for a long period of time at a small fraction of its rated horsepower; and aircraft engine is designed to live a long time by being run near its rated horsepower for a long period of time. Statistically it seems that auto engines installed in aircraft are less reliable than aircraft engines, but there are also a lot of other variables, too.