CATNU1201

2010 PACE Award winner
Federal-Mogul Nü ral EcoTough ® coated
piston offers superior wear resistance and
reduces fuel consumption up to 0.8 percent
compared to conventional piston coatings
In very high performance, heavily downsized diesel engines,
high-pressure turbocharging and new fueling strategies
are pushing piston temperatures beyond 400°C and cylinder
pressures to over 200 bar for cars and beyond 250 bar for
heavy duty trucks. Federal-Mogul’s engineers have identifi
ed that failures of conventional piston bowls in this highly
aggressive environment can be traced to the presence
of silicon particles in the aluminium. By re-melting the
alloy around the rim of the bowl, the silicon particles
can be reduced to only one tenth of their previous size,
substantially increasing the strength and durability of the
piston rim. The award-winning DuraBowl ® piston uses
this technique to increase service life between four
and seven times compared with a conventional cast
piston, allowing engine designers to continue to drive
up effi ciency to reduce fuel consumption and CO 2
emissions.
Another substantial challenge is ensuring a good fi t within
the cylinder at all loads and temperatures. The oval skirt
shape of Federal-Mogul’s Nü ral Elastoval ® piston ensures
optimum compliance of the piston skirt, allowing it to adapt
as the load changes. Coupled with high geometric stability
and minimized piston weight, this provides Elastoval ® pistons
with increased durability, superior anti-seizure properties,
and reduced friction.
XXIII
The award-winning Nü ral DuraBowl ® piston increases service life
up to 7 times compared to a conventional cast piston
Federal-Mogul Nü ral DuraBowl ® technology strengthens
the crown of a piston, improving the aluminium’s strength
where it is most needed
Engine Life (%)
800
700
600
500
400
300
200
100
0
Premium alloy
piston
DuraBowl ®
piston