HONDA Insight - Manual (Page 69)

69
E
NGINE
F
RICTION
R
EDUCTION
T
ECHNOLOGIES
To minimize energy losses, friction between moving parts is minimized by utilizing the following
features:
• Offset cylinder construction
• In the interest of friction reduction, Honda engineers specified a new lightweight aluminum-
alloy piston design for the IMA engine. The pistons have a minimal skirt area and the surface
of the skirt has been shot-peened. Shot-peening is a process in which a metal part, such as a
piston or connecting rod, is blasted with shot-like particles, creating uniform, microscopic
dimples on the surface. This dimpled surface is better able to retain a lubricating oil film.
Shot-peening the IMA engine's pistons accounts for another 1.5- to 2.0-percent reduction in
internal friction.
• Rocker arms are fitted with rollers that minimize friction on the cam's contact surfaces.
• OW20 friction-reducing engine oil
The overall load on the engine is reduced by using electric power steering. It is also reduced by the
elimination of a conventional alternator, instead using the IMA system's DC-DC Converter to power all
electrical accessories from IMA Motor/Generator power.
Rocker arms fitted with rollers