Cummins Cam it up for greater range
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DNTRARY to our report in last week's CM, the latest version of the ummins V504 engine, announced at the Brussels Motor Show on rednesday, was not first seen at Birmingham last year.
The new V504 has now bene:ed from Cummins Big Cam chnology and is in fact the first 3turally aspirated engine to do ).
Compared with the previous ?rsion, the latest engine de?lops its maximum power at 800rpm instead of 3,000rpm.
Though the gross horsepower gure is slightly lower — 138kW )mpared with 147kW (186 and )7bhp) — the nett installed gure of 128kW (172bhp) stays le same.
Maximum torque to BS Au 141 520Nm (383Ibft) at 1,600rpm, gain a decrease in engine peed (3 0Orpm) over the -evious engine.
The various changes to the engine have increased its useful working speed range from 1,100 to 1,200rpm in spite of the reduction in maximum engine speed.
Injection pressures in the Big Cam engine have been increased by 55 per cent compared with the earlier V504, which has allowed the injection duration to be reduced from 34 to 27of crank angle.
The injector rocker arms for the PT fuel system have been strengthened, and shorter tappets with hardened inserts are now used similar to those fitted to the high output 14.9 litre (909 cuin) V903. Cummins claim that the use of Big Cam technology has also greatly improved cold starting.
The latest engine should start unaided down to 0°C (32°F) which is an improvement of 8°C (15°F) over the previous small cam unit.