PRE-RELEASE
Brief description of Z19
| Brief description of Z19 |
There are three basic engine variants:
Z19DT OHC, 88 kW / 280 Nm
Z19DTH DOHC, 110 kW / 315 Nm
Z19DTR DOHC, 132 kW / 400 Nm (man) and 370 Nm (aut)
The engine is a transverse, fluid-cooled, 4-cylinder, in-line engine with 2 valves (Z19DT) or 4 valves (Z19DTH/R) per cylinder and 1 overhead camshaft (Z19DT) or 2 overhead camshafts (Z19DTH/R). The engine has direct fuel injection, which means that the fuel is injected right into the combustion chamber. It is also a crossflow engine, which means that the inlet ducts and outlet ducts are on opposite sides of the combustion chamber. The total swept volume is 1910 cm3. Engine variant Z19DTR differs from Z19DTH on a number of points. A number of components have been adapted for the increased output/torque request.
Z19DT, Z19DTH
Cylinder block, crankshaft pistons
The cylinder block is made of special cast iron. The same block is used for both Z19DT OHC and Z19DTH DOHC. Z19DTR has a unique block. The cylinder bores are drilled directly in the block. The crankshaft is seated on five bearings, with the thrust bearing located at the third main bearing. The pistons are made of a light metal alloy and have a cavity that serves as the combustion chamber. The gudgeon pin is movable in the piston and connecting rod. To reduce piston temperature, the pistons are cooled with oil by an oil nozzle spraying the underside of the piston crown. The oil pump is a conventional rotor pump. The oil filter is an insert filter. An oil/water heat exchanger cools the engine oil.
Cylinder head 8 V, OHC (Z19DT)
The cylinder head is made of aluminium and has two valves per cylinder. A camshaft is mounted with separate bearing shells. The camshaft acts on the valves via fixed valve tappets. In order to adjust the valve clearance, the valve tappets are fitted with adjusting washers. The camshaft is driven by the crankshaft via a drive belt. The supply of lubricating oil to the camshaft bearings takes place through a separate steel pipe. The shape of the inlets is designed to give a considerable rotation of the intake air.Mounted in the cylinder head are four injector valves and four glow plugs.
Z19DTH
Z19DTR
Cylinder head 16V DOHC (Z19DTH/R)
The cylinder head is manufactured in aluminium and has four valves per cylinder. Two camshafts are mounted in the camshaft housing where the bearings are fitted. The bearings are of different dimensions so that the camshaft can be extracted through one end of the camshaft housing. The camshafts act on roller bearing rocker arms that are pivoted at one end. A ball cup constitutes the upper part of the hydraulic valve clearance balancers and pressed on the valve stem on the other end of the rocker arm. The hydraulic valve clearance balancers keep the play between camshaft and rocker arm/roller bearing close to zero. The exhaust camshaft is driven by the crankshaft via a drive belt and has a gear pinion that transfers power to the intake camshaft gear pinion.Mounted in the cylinder head are four injector valves and four glow plugs.
The cylinder head for Z19DTR differs on a number of points, such as the inlet and exhaust ducts, the exhaust valves and the shape of the cooling ducts.
