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The Chrysler A57 Multibank, comprised of five 6-cylinder inline engines joined onto to a common output shaft. This engine powered the M4A4 Sherman. All in, it had 30 cylinders, 30 spark plugs, displaced 20.5 litres (1,253 cu in) and weighed over 2.5 tons. Total output was 450 hp and 1,440 Nm (1,000 lb ft) of torque.
Despite its complexity, the A57 was actually a very reliable engine. However, due to its large size, the M4A4 Sherman had a slightly longer hull to accommodate it.

1962 French G.P. of F.1 at Rouen
Porsche 804 air cooled flat 8 engine
First F.1 victory for a Porsche with Dan Gurney at the wheel.

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I was born in '63, and I seriously resent not hearing that DOHC flat 8 scream....

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The Mercedes V6 Hybrid Formula One engine, is a series of 1.6-liter, hybrid turbocharged V6 racing engines which features both a kinetic energy recovery system (MGU-K) and a heat energy recovery system (MGU-H), developed and produced by Mercedes-AMG High Performance Powertrains for use in Formula One. The engines were in use since the 2014 season by the Mercedes works team. Over years of development, engine power was increased from 840 horsepower at 15,000 rpm, to 1,070 horsepower at 15,000 rpm. Customer team engines were used by Williams, McLaren, Lotus, Manor Racing, Force India, Racing Point Force India, Racing Point and Aston Martin.

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^^^ Ridiculously cool.

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The Zvezda M503 (built at AO Zvezda at St Petersburg) is a maritime 7 bank, 42 cylinder diesel radial engine built in the 1970s by the Soviet Union. Its primary use was in Soviet missile boats that used three of these engines.

Work in progress.

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Lincoln V-12

I saw this at a car show once - not sure I'd ever seen a twin plugged bug before:

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I think that’s a Wilhoit built 356 engine in a 356.

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Twin #Turbo #Flathead #Ford #V8

This is real - nitro-fueled V8 drill.

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