Text: Marcus De Guzman / Photos: Chrsyler | posted September 02, 2015 11:49
Updated Pentastar engine now benefits from variable valve lift and cooled EGR
The soon-to-be-released 2016 Jeep Grand Cherokee will be the first model to be fitted with the updated Pentastar V6 that now benefits from technologies such as variable valve lift and weight saving.
The 3.6-liter V6 already has variable valve timing (VVT) but Chrysler fitted the said engine with a two-step variable valve lift (VVL) which improves fuel economy by 2.7%. On normal conditions, the system works on 'low-lift mode' and only shifts to 'high-lift mode' when more power is demanded, providing better combustion.
Also helping the engine perform better is a new cooled exhaust gas recirculation (EGR) that reduces emissions and pumping losses. Chrysler claims that the revised EGR allows the engine to gain an additional 0.8% improvement in fuel economy and knock-free operation at higher loads.
The VVT system has also been tweaked and now delivers more torque as the engine has also been equipped with a new intake manifold that has longer runners. In total, Chrysler said the engine has a 14.9% increase in torque, depending on the vehicle application. Chrysler added that this can easily be felt between 1,000 – 3,000 rpms.
Other improvements made to the 3.6-liter Pentastar V6 include: increased compression ratio of 11.3:1 (previously 10.2:1), high tumble intake ports, eight-hole fuel injectors with optimized atomization and lightweight components that reduce overall weight by up to 1.8kg.
As of this writing, Chrysler stated that the revised V6 engine will produce 299 PS (294 PS previous) when it debuts in the 2016 Grand Cherokee. Official torque rating however has yet to be revealed.