@Adirondackwannabe @mrentropy Porsche did it with this super charged custom built engine built out of aluminum, magnesium and titanium parts and couldn’t imagine the price tag on that power plant….
_“To reduce torsional stresses on the long 12-cylinder crankshaft, all takeoffs for power and ancillary drives were taken from the center of the crank. In 911 fashion, each cylinder had its own individual aluminum head. These were topped with a common camshaft carrier, one per bank. The dual overhead camshafts, four in all, were gear driven. Low weight, both in terms of the complete engine, and the rotating masses within, was a key priority. The crankcase was aluminum-magnesium alloy and the cam carriers and cam covers were magnesium. Cylinder barrels were aluminum with nikasil liners. The connecting rods, rod bolts, fan drive shaft, auxiliary and output shafts and other miscellaneous hardware were made of titanium. The fan shrouding, cooling fan and intake stacks were fiberglass. The cooling fan displaced up to 148 cubic meters of air per minute.
Like the 911, the 917 employed a dry sump oiling system. This one utilized no less than seven pumps. A triple unit in the sump provided pressure and scavenging of the front and rear of the crankcase, and four small pumps located at each end of the exhaust camshafts allowed for scavenging oil from the cylinder heads. The system held 30 litres of oil. Each cylinder had dual spark plugs, ignited by two seperate distributors. Fuel was supplied by Bosch mechanical fuel injection. The initial batch of 4.5 litre versions produced 520–580 hp at 8500 rpm, the turbocharged versions generated up to 1580 hp on full boost“_