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We are talking an inline 12 with 38 inch diameter pistons and a 98 inch
stroke, that makes over 100,000 horsepower!

The Wartsila NSD (Sulzer) RTA96-C two-stroke diesel engine is the most
powerful and most efficient piston prime-mover in the world today.

Bore - just under 3'2" (965mm).
Stroke - just over 8'2" (2489mm).

Available in 6 through 12 cylinder versions (all inline). Engine weight exceeds 2000 tons in the 12 cylinder version (the crankshaft alone exceeds 300 tons). Point of maximum continuous power is 89,640 HP (66,844kW) at 100RPM with the 12 cylinder version. Point of maximum fuel economy is 53,244 HP (37,704kW) at 90 RPM. The 12-cylinder engine exceeded 100,000 horsepower during overspeed testing (all of 101.5 RPM!) while under test at Japan's Diesel Union works (who built the first engines and from who these pictures are taken).

Fuel consumption at maximum power is 0.278 lbs/HP/hour (BSFC). Fuel consumption at maximum economy is 0.260 lbs/HP/hour.

At maximum economy the Sulzer engine exceeds 50% thermal efficiency i.e.more than 50% of the fuel going into the engine is converted to power). For comparison, consider that automotive and small aircraft spark-ignition engines have British Standard Fuel Consumption figures in the 0.40-0.60 lbs/HP/hour range and 25-30% thermal efficiency. A Caterpillar 3516s consume roughly 0.42lbs/HP/hour of diesel (unknown thermal efficiency).

The 3516 is a 16 cylinder locomotive / ship engine with a 7" bore and stroke (18000 lb) Even at its most efficient power setting, the Sulzer 12 cylinder consumes nearly 1,660 gallons of heavy fuel oil an hour.
 
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