Jazz Earth Dreams Engines

1.5L Direct Injection DOHC i-VTEC

The Jazz’s new Earth Dreams Technology engine retains the same 1.5L displacement as the previous powerplant, but that's just about the only thing that carries over. As with the 1.3L, it utilises a DOHC valvetrain in conjunction with iVTEC and VTC. A host of other refinements have been made to optimise combustion, reduce weight and minimise friction. The result is an increase in both power and fuel efficiency.

 

Key New Features

Cylinder Head and Valvetrain

• Double Over Head Camshaft (DOHC) configuration
• Valve diameter increase, decrease plug diameter
• Direct Injection, multi hole injectors
• High Tumble Intake charge
• i-VTEC (Intelligent Variable Valve Timing and Lift Electronic Control) with Variable Timing Control (VTC)

 

Engine Bottom End

• Aluminium cooling collar
• Improved piston design
• Improved cooling and lubrication
• Reduction in weight of rotational parts
• High compression 11.5:1 ratio

 

1.3L Atkinson Cycle DOHC i-VTEC

The completely new 1.3L Atkinson Cycle DOHC (Double Over Head Camshaft) i-VTEC engine delivers 73kW and 119Nm of torque. Introducing elements of Honda’s Earth Dreams Technology, it greatly enhances both the driving performance and fuel efficiency of the vehicle.

The DOHC valvetrain means greater performance in conjunction with i-VTEC and E-VTC (Electric Variable Timing Control).

The Atkinson cycle engine coupled with the all new CVT transmission provides excellent fuel economy and driver enjoyment.

Fuel economy figures have also significantly improved due to the efficient nature of the Atkinson cycle layout, extensive friction reduction measures and drastic improvements in weight and lubrication in the CVT gearbox.

Fuel efficiency is improved by 1.5L per 100km. This equates to a more than 147km of extra driving per tank of petrol, even though the tank is 2 litres smaller than the previous model.

 

Key New Features

Cylinder Head and Valvetrain

• Double Over Head Camshaft configuration
• High Flow Intake port
• i-VTEC with Electric Variable Timing Control (E-VTC)

 

Engine Bottom End

• Aluminium cooling collar
• Improved cooling and lubrication
• Revised piston design
• Reduction in weight of rotational parts
• High compression 13.5:1 ratio.
• EGR cooler

 

Atkinson Cycle Operation

Improved Fuel Economy, over 25% reduction in L/100km over previous generation Jazz 1.3 engine. Reduced from 6.6L/100km to 5.1L/100kms.

The modern Atkinson engine delays the intake valve closing, causing the compression stroke to be shorter than the power stroke. As a result the compression ratio is decreased, while the expansion ratio remains the same. This means the air in the expansion stroke is at a higher compression ratio. The benefit of this is that the pressure in the combustion chamber at the end of the power stroke is as close as possible to atmospheric pressure, meaning that more of the energy obtained from the explosion has been converted into mechanical power (something we can use to turn the wheels, rather than heat), thus increasing the efficiency and resulting in a more effective use of the petrol.

As controlling the intake valve operation is the key to the modern Atkinson engine, Honda has matched this with a combination of i-VTEC and Electric VTC systems. The combination of these technologies gives both the advantages of an Atkinson Cycle engine, coupled with the economy and performance advantages provided by the high and low cam profiles of the i-VTEC system. The electric VTC system also gives more rapid and precise control of camshaft advance and retard, and continuous control of valve phase.