Years of research into improving the wear resistance properties of polyamide 46 is starting to yield major dividends for DSM as auto manufacturers accelerate replacement of polyamide 66 used in chain driven valve timing systems in new turbocharged engines.
New formulation Stanyl HGR1 polyamide 46-based material was used in the launch of a new version of the Pentastar V6 engine, developed by Fiat Chrysler, DSM announced last year.
“By substituting PA66 with Stanyl HGR1 in the timing systems chain contact surfaces, frictional torque can be cut by 0.65 Nm,” said Bill Burnham, DSM business development manager. “This equates to a fuel efficiency improvement of over a mile per gallon (over 0.4 km/L) over the drive cycle; that’s a substantial amount!” In comparison to PA66, Stanyl HGR1 delivered 10% lower frictional torque within the critical engine speed range between 650 and 1800 rpm.”
Now a new improved grade designated Stanyl HGR2 is being rolled out by Ford in truck and series car production models, including the Fiesta. A friction reduction of 20 to 40 percent yields a 1 percent improvement in fuel economy, according to DSM. Testing was done by BorgWarner on Ford’s engine timing drive and valve train.
Nissan, Suzuki, and other OEMs are also using Stanyl HGR2 in new engine designs. The price premium of HGR2 is repaid in a year by fuel savings, said DSM.