2012 Lexus LFA User Guide - Page 3

33

Powertrain

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Low friction internals

While the engine in the Nürburgring Package is the same engine model as the stan-

dard package, by meticulously adjusting items like the amount of oil supplied and the

friction surfaces of moving parts, a further reduction in friction has been achieved.

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Oil feed pump

In the standard engine, an inner relief system that circulates oil inside the oil feed pump

has been adopted. This restricts oil level fluctuations in the crankcase and oil pan,

achieving a reduction in friction and the occurrence of air bubbles in the oil.

Moreover, an exclusive pump was adopted for the cam timing adjusters (VVT-i). By

increasing the pressure of the oil supplied from the feed pump, the VVT-i can be oper-

ated even more effectively while the total amount of oil was reduced, thereby contrib-

uting to a reduction in total friction.

With the Nürburgring Package, the clearances inside the pump were optimized by

balancing the oil supply more precisely, further reducing friction.

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Piston rings

In the standard package’s engine, linerless thermally sprayed bores were adopted for

the cylinder bore surface, simultaneously improving heat dissipation and reducing cyl-

inder bore distortion.

This accordingly made it possible to lower the tension of the top & second ring more

than that of a common mass-production engine and at the same time a thin 2-piece

nitride processed oil ring has been adopted, reducing friction losses.

Through the utilization of these aspects and optimized ring specifications, a further

reduction in friction has been achieved in the Nürburgring Package.