Stralis tractors and trucks are all fitted with Cursor 10 engines in two sizes – 400 HP (294 kW) and 430 HP (316 kW) – and Cursor 13 engines, 480 HP (353 kW) and 540 HP (397 kW). Both engines have high pressure direct injection. An overhead camshaft drives the single pump injectors. The variable geometry turbocharger is optimised to provide the highest levels of performance at all rev rates. The performance of the decompression engine brake is enhanced by the turbocharger. All engine functions are electronically controlled: injection, advance turbo geometry, engine braking and speed limiter. The main line is linked to other electronic units, which control the gearbox, brakes and transmission braking. The two Cursor engines also comply with the conditions of the Euro 3 directive on polluting emissions.
Cursor engines: sizes and performance
Cursor 10: 6 in-line cylinders, bore: 125 mm – stroke: 140 mm – displacement: 10308 cm3
Cursor 10-400: Maximum output: 400 HP (294 kW) from 1600 to 2100 rpm
Maximum torque: 194 kgm (1900 Nm) from 1050 to 1480 rpm
Output/litre: 38.8 HP/litre
Approved for 5 Ecopoints
Cursor 10-430: Maximum output: 430 HP (316 kW) from 1570 to 2100 rpm
Maximum torque: 194 kgm (1900 Nm) from 1050 to 1570 rpm
Output/litre: 41.7 HP/litre
Approved for 5 Ecopoints
Cursor 13: 6 in-line cylinders, bore: 135 mm – stroke: 150 mm – displacement: 12882 cm3
Cursor 13-480: Maximum output: 480 HP (353 kW) from 1530 to 1900 rpm
Maximum torque: 224 kgm (2200 Nm) from 1000 to 1550 rpm
Output/litre: 37.3 HP/litre
Approved for 5 Ecopoints
Cursor 13-540: Maximum output: 540 HP (397 kW) from 1600 to 1900 rpm
Maximum torque: 240 kgm (2350 Nm) from 1000 to 1610 rpm
Output/litre: 41.9 HP/litre
Approved for 5 Ecopoints
Approval for 4 Ecopoints is available on all engine settings.
The Cursor engines feature high maximum torque (at least 400 rpm), which is matched by a maximum constant output of 500 rpm with the Cursor 10 and almost 400 rpm with the Cursor 13. The new Cursor 13-540 yields maximum output at 1600 rpm.
The new 540 HP Cursor 13
The Cursor 13 shares the structural characteristics of the other Cursors. The crankcase is secured with a skirt, which holds the seven bearing caps where the crankshaft rests, and the cylinder head. The timing is to the side of the flywheel for vibration-free, low noise transmission of the action of the 24 valves and 6 pump injectors. The aluminium monobloc pistons promote the dispersion of combustion heat through the cylinder water jackets thus avoiding high temperatures, which could damage the oil in the piston head.
The latest addition to the range, the 540 HP Cursor 13, has been in circulation on customers' vehicles for some time now. With the benefit of four years of trials and customer usage of the other two engines in the range, the Cursor 13 boasts an operative life span, which we reckon is unbeatable.
The Iveco Turbo Brake: 408 HP of constant braking power
All the Cursor engines are supplied with a “turbocharged” decompression brake: the partial reopening of the valve at the end of the compression phase means that the “engine braking” action is increased, fully exploiting resistance. With the help of the variable geometry turbocharger which fills the cylinders with air, the braking power of the ITB (Iveco Turbo Brake) reaches a constant 280 kW (380 HP) at 2600 rpm on the Cursor 10. On the Cursor 13 a constant 300 kW (408 HP) at 2400 rpm, or 240 kW (326 HP) at 1900 rpm. The performance of the ITB is comparable to that of a transmission brake. Lastly, the decompression brake, which is modulated through the geometry of the turbo, means that speed can be regulated in descent. The decompression braking technique is superior to the exhaust brake, as it does not cause overheating of the upper parts of the engine. Another advantage is the fact that the heat generated when the ITB absorbs the energy is mostly dispersed in the exhaust gases and does not represent an additional workload for the engine cooling system, which thus remains free for transmission braking.
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