Crankcase

Like Cummins Westport’s L9N and ISX12N engines, the B6.7N features on-board diagnostics, an enhanced, maintenance-free three-way catalyst, a closed crankcase ventilation system, and an engine control module recently redesigned for improved durability.

Shortly after departing Prince Rupert Island on Aprl 15, the lead aircraft Seattle, flown by Martin with Harvey (the only fully qualified mechanic in the flight), blew a three-inch hole in its crankcase and was forced to land on Portage Bay.

Aircraft * Wright Aeronautical used a magnesium crankcase in the WWII-era Wright Duplex Cyclone aviation engine.

An aluminum crankcase carried two blocks of three cylinders each along each side, with a 60 degree included angle.

An engine loses up to 75% of its generated energy in the form of friction, noise and vibration in the crankcase and piston area.

Critical engine development problems The early development of the "coupled" engines, began in the late 1930s with Daimer-Benz's development of a 1,500 kW class engine design using a single crankcase.

Early aero engines In 1909 Renault pioneered aero V12s with a 60 degree air-cooled engine with individual finned cylinders and F-head valve arrangement, driven by single camshaft in the crankcase.

If the "tickler" is held down too long it also floods the outside of the carburetor and the crankcase below, and is therefore a fire hazard.

In piston engines the crankcase oil is contaminated by combustion blow-by through the piston rings.

Most diesel engines that power ships like supertankers are built so that the engine can safely use low-grade fuels due to their separate cylinder and crankcase lubrication.

The sealing at the Wankel apexes is less critical, as leakage is between adjacent chambers on adjacent strokes of the cycle, rather than to the crankcase.

This presented a serious problem for the earliest models of the Boeing B-29 heavy bomber when an in-flight engine fire ignited the engine crankcase.

This was achieved by the use of bevel gearing at the rear of the crankcase, resulting in the eleven-cylindered Siemens-Halske Sh.

Thus the richness of the mixture in the cylinder could not be controlled via the crankcase intake.

While most production V8 engines use four crank throws spaced 90° apart, high-performance V8 engines often use a "flat" crankshaft with throws spaced 180° apart, essentially resulting in two straight four engines running on a common crankcase.