Amazing aircraft the B-29...
... a flight of 3 emergency landed in western Russia, Vladivostok I think.
The American crew got home, but we never got the B-29s back. Soon enough, the Reds reverse engineered an exact duplicate. The Tupolev Tu-4.
https://en.wikipedia.org/wiki/Tupolev_Tu-4
....Late in the war,... the R-3350 was equipped with direct fuel injection, something we think of as a new-age engine appliance. Unlike early fuel injection ... direct fuel injection puts it directly into the cylinder under pressure, improving mixture distribution and fuel economy...
For full disclosure, the CR in aviation engines is far less than for cars, for reliability purposes. I believe that made the early direct injection systems a bit easier to achieve.
- Art