[V8] turbo v8

[Jeremy Ward]

>From the elves:

"The cylinder block is cast in hypereutectic alloy
of aluminum with a 17% silicon content and
weighs only 62 lbs. (28.1 kg).
Cylinder areas are specially treated to etch away
the aluminum and expose the hard silicon
crystals as a bearing surface for the pistons and
piston rings. This means that conventional
cylinder sleeves are not needed.
A fully balanced heat treated steel crankshaft is
used in the Audi V8 Quattro.
It is forged in a single plane and twisted while it is
still hot so the rod journals are at 90° to each
other. This process ensures the optimum
formation of the crankshaft counterweights. The
counterweights continue the momentum of the
power strokes from cylinder to cylinder for
smooth engine operation.
The crankshaft bearing caps are cast in nodular
iron for strength and reduce the expansion of the
main bearings in the aluminum cylinder block
when the engine is hot.
The lightweight connecting rods are also forged
from aluminum alloy. They are 154 mm long,
20.5 mm wide and weigh 621 grams, including
the bearing.
The aluminum slipper-skirt pistons are
electroplated with iron, and then thinly coated
with tin. In this way, the pistons and cylinder
bores seat in together during the engine break-in
period to give low-wear moving surfaces.
Piston crowns are cooled on the underside by a
jet spray of engine oil."

Cheers,

- Jeremy