So cluttered up it sure does not look like an inline 6

“High-flow ball-valve thermostat minimizes restriction in the cooling system, reducing mechanical losses”

so much for cooling systems “needing restriction to properly carry away the heat”

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“ Tough Coating for The Cylinders

Less friction, reduced weight and unparalleled wear resistance from a thermal sprayed microstructure of metallic and oxide components that metallurgically transformare the key benefits of the PTWA coating inside the cylinders, an alternative to the traditional cast-in-place or pressed-in cast iron cylinder liners. The PTWA coating is ultra-thin, compared with 3 to 4 millimeters of a cast iron liner, and has 10 times the wear resistance.

Minimizing friction throughout the engine enhances its efficiency, reducing its emissions and fuel consumption.

The PTWA coating is applied to the Hurricane block during the manufacturing process at the Saltillo North Engine Plant. The process, adapted from the aerospace industry, melts a steel alloy wire at 2,300 degrees Celsius (4,150 degrees Fahrenheit), producing microscopic particles sprayed onto the cylinder walls at high velocities, where the particles splat-cool to form the coating and form a physical bond to the aluminum cylinder bore. Honing the surface gives it a super-fine cross hatch pattern with controlled micro porosity for oil retention.

The PTWA spray process leaves more aluminum between the cylinders for better heat transfer and engine cooling. This enables propulsion engineers to optimize the air-fuel mixture and advance the ignition timing (spark) over a wide operating range, another mechanism to reduce carbon dioxide and other emissions.”

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It used to be a rule of thumb that maximum average up and down piston speed should not exceed 1000 feet per minute at the best rpm for fuel economy.

With ever thinner low drag rings,
and now special bore coatings,
maybe the optimum fuel economy piston speed has moved up to 1500 feet per minute, or even 2000?