Model year 2006 sees the addition of the Z 18 XER DOHC-I petrol engine to the range of engines available for the Zafira-B.
The Z 18 XER petrol engine is the second further development in the family of 3rd generation medium-sized engines.
Thanks to the introduction of two continuously adjustable camshafts, output and torque on the Z 18 XER petrol engine have been increased, compared with the already familiar Z 18 XE and Z 18 XEL petrol engines, whilst fuel consumption has been simultaneously reduced.
To reduce fuel consumption and weight even further and improve smooth running performance, the Z 18 XER petrol engine also features a new plastic intake module.
The intake ports in the cylinder head of the Z 18 XER DOHC-I petrol engine have also been re-designed. The new design means that the intake air flow, which has already been straightened and smoothed out in the plastic intake module, can be led to the intake valve without being swirled about.
The Z 18 XER petrol engine has two camshaft sprockets which can be adjusted independently of each other by means of oil pressure. The intake camshaft can be advanced by up to 60° of crank angle, the exhaust camshaft by up to 45°. Camshaft adjustment control is continuous for as long as the engine is operating and is done by applying an oil pressure at the camshaft sprocket adjustment mechanism which in turn is controlled by the engine management system as a function of load.
The Z 18 XER DOHC-I petrol engine uses the Simtec 75.1 EMS (electronic engine management system) from Siemens VDO to control the engine.
The Z 18 XER DOHC-I petrol engine also uses the map-controlled thermostat system, which is already familiar from the Z 16 XEP DOHC petrol engine. This means the coolant temperature is regulated by the EMS Simtec 75.1 and adapted to the load conditions and requirements of the engine.
The main features of the Z 18 XER DOHC-I petrol engine:
Two overhead camshafts, continuously adjusted by camshaft adjusters
New plastic intake module with two-stage intake control by means of a switching drum
New 4-in-1 exhaust manifold panel - one-part design
New pistons with floating piston pins and piston cooling
New plastic thermostat module with electronic, map-controlled thermostat
New cylinder head and cylinder block design
Optimised crank drive and cam drive
New oil pan, standard for all 3rd generation I-family engines.
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