I looked for the auction that sold TAG Porsche engines didn't find it. (It is listed in a prior page on this thread.) They were selling used engines that had won 4 and 5 races. Modern F1 engines are required to be used for 2 races. Porsche entered into the F1 turbo engine building business from an endurance racing background. They built 50 hr engines at 950 hp from 1.5L. They weren't built to cool that much power continuously but mechanically they made that much power for 50hrs before needing to be rebuilt. At a power density of 666hp/L it should be possible to make a 50hr TBO engine that is aircraft rated. That would be uprating the Tag Porsche for continuous output. It may be possible to build a 50hr air race engine that is rated at 1,000hp/L. That is my design point. Keeping the average piston speed down is critical for long engine life. That means a short stroke. Cooling and knock dictates a small bore. Getting enough bearing area into a small enough package dictates a two crankshaft arrangement. So the layout that I'm looking at is a twin V-16 42.5mm bore and 33mm stroke. At the average piston speed that NASCAR and F1 use it would make insane amounts of power. 2,100 hp for the twin engine combo. 1,400hp/L back it off to 1,400hp for both crankshafts together and should last a lot longer than at 2,100hp. http://tinyurl.com/yffwqoxThis calc shows the engine The calc has two self compensating math errors I haven't gone back and fixed them yet. But it does work.As far as the money goes ya it wouldn't be cheap but it would be fun and I mean fun.