PRE-RELEASE
Brief description
| Brief description |
The engine is a transversely mounted, water cooled, 4-cylinder in-line engine with 4 valves per cylinder, 2 overhead camshafts. The engine has direct fuel injection, which means fuel is injected directly into the combustion chamber. It is also cross-flow type, i.e. the inlet ducts on one side of the combustion chamber and the exhaust ducts on the other. The total swept volume is 1910 cm3.
Z19DTR
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.
Z19DTR
Cylinder head 16V DOHC
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.
