| Feature |
Isuzu Benefit |
Isuzu 6H |
Caterpillar C7 |
Navistar DT466 |
Cummins ISB |
| Cylinder Design |
Easy removal, no reboring needed |
Sleeved (dry) - Precision machined allows for easy replacement |
Non-sleeved |
Sleeved (wet) |
Non-sleeved |
| Valve Guide/Seat Replacement |
Available |
Available |
Available |
Available |
Available |
| Crankshaft Heat Treatment |
Nitrided heat treatment has proven durability over induction hardening |
Nitrided |
Induction Hardened |
Induction Hardened |
Induction Hardened |
| Injection System |
Common rail system requires no oil. Less oil equals lower overall costs |
Denso Common Rail System |
Common Rail |
Common Rail |
Bosch Common Rail |
| B10 Rating |
"Best-in-Class" Durability |
B10=410,000 miles |
B50=500,000 miles |
B10=300,000 miles |
B50=300,000 miles |
| Piston |
Engine does not run as hot |
Has internal oil cooling channel |
Does not have internal oil cooling channel |
Does not have internal oil cooling channel |
Does not have internal oil cooling channel |
| Oil Pump |
Gear type is most dependable |
Gear type |
Gear type |
Gear-rotor |
Gear-rotor |
| Oil Cooler & Structure |
Internal has fewest leak paths. Unitized also reduces leak paths |
Internal to engine, unitized |
Internal to engine, separated |
External |
Internal, separated |
| Oil Thermostat |
Better control of oil temps increases durability, quicker warmup |
Yes |
None |
None |
None |
| Coolant Thermostat |
More precise control of coolant temp increases durability |
2 units |
1 unit |
1 unit |
1 unit |
| Valve Layout |
More efficient control of engine combustion lowers emissions |
4 valves / cylinders |
3 valves / cylinders |
4 valves / cylinders |
4 valves / cylinders |
| Camshaft |
OHC is lighter and valve control has less parts, no pushrods |
OHC |
OHV |
OHV |
OHV |
| Tappet |
Fewer parts |
None |
Roller Follower |
Roller Tappet |
Slipper Tappet |
