Related by context. Frequent words. (Click for all words.) 67 hydrogen internal combustion 66 aftertreatment 66 Selective Catalytic Reduction SCR 66 Ti VCT 63 variable valve 63 Ford EcoBoost 63 conventional internal combustion 62 gas recirculation 62 ACERT 61 BlueTec 61 urea injection 61 #.# liter Duratorq 60 diesel engine 60 Theta II 59 reduce NOx emissions 59 NOx reduction 59 turbo diesel engine 59 iWarranty 59 gas recirculation EGR 59 cylinder turbo diesel 59 #.# liter Ecotec 58 cylinder turbocharged 58 cylinder deactivation 58 injection turbocharged 58 turbocharged diesel 58 hybrid propulsion 58 diesel particulate filter 57 nitrogen oxide NOx emissions 57 #.#L engine 57 V6 diesel 57 spark ignition 57 Hybrid Synergy Drive 57 efficient powertrains 57 turbocharging 57 TDI diesel 57 particulate filter 57 intercooled 57 hybrid powertrains 57 hybrid drivetrain 57 diesel particulate filters 57 Turbocharger 56 Fiat Powertrain Technologies 56 diesel engines 56 AuraGen 56 electric powertrain 56 EcoBoost engines 56 MultiAir 56 Biobutanol 56 VVT i 56 FlexFuel 56 8 CYL 56 Duratec 56 Efficient Dynamics 55 BMW EfficientDynamics 55 PACCAR MX engine 55 gaseous fuels 55 cleanest diesel 55 Dual Fuel 55 #.# liter Duratec 55 electric propulsion 55 Turbo Diesel 55 #hp #kW [002] 55 dry sump 55 electrically driven 55 H2GO TM 55 Cummins Westport 55 BioPower 54 drivelines 54 Capstone MicroTurbine 54 #.#L diesel 54 bi turbo 54 PurePower 54 CleanFUEL USA 54 MaxxForce 54 dual overhead cam 54 selective catalytic reduction 54 naturally aspirated engine 54 Coal gasification 54 twin scroll turbocharger 54 Cummins Westport Inc. 54 Multijet 54 HYbrid4 54 dry sump lubrication 54 BLUETEC 54 Variable Valve Timing 54 #.# liter HDi 53 ePower 53 cylinder diesel 53 String Ribbon 53 drivetrain components 53 SOHC 53 turbo diesel 53 electric drivetrain 53 evaporative emissions 53 reciprocating engines 53 B# biodiesel [002] 53 BlueEFFICIENCY 53 V6 engines 53 Apriso FlexNet 53 6 CYL 53 #.#L V8 #V