BMW 801 vs. Shvetsov ASh-82

I just re-watched your "turbo charging vs supercharging" video. Have you dealt with how the merlin was supercharged in any video? Unless I have missed something, it is mechanically supercharged, and did just as well(?) in the P-51 at high altitudes as the turbocharged P-47.

David Terry Wallace

David makes a good point about that. I have often wondered about that as well

David Stange Jr

I'm really excited for any videos on the 801 and the 190. It seems like there are so many tiny bits of information out there, that it's really difficult to get a good understanding without putting hours of research into it. Your videos always make things much clearer. Thank you so much for sharing all your knowledge.

Great future video idea!

Andrew MacDougall

I would like to see a comparison of the Allison V12j used in the P-40 and P-38, and the Rolls-Royce Merlin. I always inferred from what I heard that the Allison was just an inferior engine. From things you have said, I understand some of the difference between them was the available supercharging. Is there a way to compare these engines disregarding the differences in supercharging?

David Terry Wallace

Good video

Dan Nafe

Unfortunately it seems that once you set the video to premiere I am unable to view it until it goes public.

All the connecting rods on a radial engine connect to a common bearing assembly on the crankshaft, as shown in this video. I have often wondered how that common bearing assemble maintains its proper orientation on the crankshaft. If it were to rotate on the crankshaft, all the pistons would be out of time with the camshaft. If anyone knows the answer to this, I look forward to seeing it, or perhaps a link to another video that shows it.

Thanks. The biggest development that had occurred by the mid-50s was in material science. As we move back in the history of internal combustion engines rings get progressively thicker and more numerous. Just as more advanced steel alloying benefitted compressor blades it benefits piston rings, although not applied in this area until later as the reduced demand for piston engine innovation allowed the basic WW2 reciprocating assembly design solutions to serve into the 50s.

Thanks Greg!

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