Crankshaft and Mechanicals

Crankshaft

A reduction in weight was achieved through a deeper central bore in the crankshaft on the pulley side.

Connecting Rod Bearings

"Sputtered bearings" are mounted on the rod side as connecting-rod bearings. Sputtered bearings are high-performance bearings. Higher engine output powers require materials with a significantly higher fatigue strength, lower wearing rate, and good corrosion resistance at high temperatures, particularly for the connecting-rod bearings.

NOTE: Two lugs are provided for the twist lock in order to ensure that the sputtered bearings are mounted on the rod side. In addition, the identification "Sputter" is provided on the rear of the bearing.

These complex requirements are met by way of cathode sputtering. Micro-particles are ejected from a donor material in a high vacuum. These particles are applied uniformly to the part which is to be coated using electromagnetic fields. These magnetron layers are characterized by extremely fine distribution of the individual structural elements. The basis is the already known three-component bearing. The sputtered bearing has a conventional bearing structure, with the top plated layer replaced with a sputtered lining.

Connecting Rods

The connecting rods have been left practically unchanged, apart from the fact that two grooves have been incorporated on the rod side for the sputtered bearing twist lock.

Pistons

The pistons are of a symmetrical design; arrows are provided on the piston crown to indicate the installation position. When installing the pistons, it must be ensured that these arrows point in driving direction.

Piston Rings

Three-part rail rings are used as oil scraper rings on the new 911 Turbo in order to reduce the "blow by" gases, which results in a reduction of oil consumption. These very thin rings are able to adapt themselves optimally to the cylinder shape, thereby optimizing sealing quality.

Cylinder Base Seal

A three-part cylinder base seal is used here in order to improve the sealing quality between the crankcase and the cylinder housing. The seal of the new 911 Turbo is 0.3 mm thicker than the seal used in the past.

Cylinder Housing

The cylinder housing and cylinder sleeves have been shortened by 0.3 mm in order to maintain the same overall cylinder height and compression ratio.