[Jim]

The talk of break-in procedures reminded me of this WWII film. After assembly, they ran the 18-cylinder, 2200 hp engine for 4 hours on the dyno. Then it was disassembled, inspected, reassembled, and again dyno'ed before deciding it was flightworthy. Start at the 12-minute mark. If you like that, watch from the beginning. https://www.youtube....h?v=_t3akMEm9bI

[re tired]

That's the stuff right there.

Kinda makes my rd125 seem lame.

[POE]

Good find, Jim. Love that kind of stuff.

[Turner]

Cool vid. 30 minutes after the Japanese surrender, operations ceased. Dang!

[Jim]

As cool as the above engine is, I do know of a bigger one. It's the Pratt & Whitney R-4360 "Wasp Major". 4360 indicated its size in cubic inches. It had 28 cylinders (4 rows of a radial 7) and could develop up to 4,300 horsepower. It ran on purple 115/145 avgas. Anything above 100 octane is actually a "performance number". So the 115 "octane" rating was at lean (cruising) conditions, and the 145 "octane" was at rich (full power) conditions. Using that rating scheme, 145 meant the engine could produce 45% more power than 100-octane fuel. The fuel was so heavily leaded that fouling of spark plugs was a common occurrence. Each cylinder had 2 plugs.

Six such engines were used in the Convair B-36 Peacemaker. (Each plane had 336 spark plugs!) See: https://en.wikipedia...B-36_Peacemaker

The B-36 also used 4 jet engines which caused people to say it had "six turning and four burning".