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Boy did this thread go off on a tangent! Cool link to the napier nomad engine btw.
In relation to the rotating liner though. It's pretty much the only solution to the piston ring drag in an engine that i have seen. Ok, it's more complex but if built properly and by a japaneese company it would be pretty reliable im sure.
There are other losses in an engine too, valves being one of them. The coates system seems to be dead in the water due to sealing issues i suspect.
What are the friction losses like in the desmodromic system used in motorbikes? The lack of valve springs may help?
The diesel fuel pump is also a power hog. Could this be improved upon?
My thinking behind all this is that if a significant amount of fuel is used just turning the engine over, then thats where there should be most of the work done to lower fuel consumption.
Thats not to lessen the importance of good aerodynamics either. It all plays a part.
Ideas anyone?
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