The Isuzu 4JJ1X is a 2.999-liter, 4-cylinder inline 4 diesel engine used in commercial and industrial generator applications in the 51-62 kW class. Turbocharged for reliable power density across standby and prime-rated duty cycles.
This engine powers generators from Airman, Atlas Copco, Echo, Hipower Systems, making it one of the more widely deployed prime movers in its power class for the commercial standby market.
Generator models that ship with or are commonly paired with the Isuzu 4JJ1X.
Airman
Airman EBOSS 70-45
Only integrated diesel-battery hybrid portable generator on the market — LTO batteries, unlimited paralleling, dramatic fuel and emissions reduction.
60 kW standby · Diesel · Liquid-cooled
Noise-sensitive urban construction, events, and sites where fuel cost and emissions matter.
70 kVA hybrid energy system with 45 kWh LTO battery storage. Diesel-battery hybrid for reduced fuel and emissions.
3-phaseconstructionrental-fleet
Airman
Airman SDG65
0.001% warranty claim rate, 110% fluid containment standard, 28.5-hr runtime at 51 kW — bridges the gap between compact towables and large trailer units with premium Isuzu reliability.
55 kW standby · Diesel · Liquid-cooled
Mid-size 51 kW portable for commercial construction, emergency standby, and event power where loads exceed 36 kW but a full-size 100 kW trailer is unnecessary.
51 kW prime diesel portable generator. Isuzu 4JJ1X engine with 28.5-hour runtime, 111-gallon tank, and 110% fluid containment.
Tier 4 Final3-phaseconstructionrental-fleet
Atlas Copco
Atlas Copco QAS 70
67 dBA — 5 dB quieter than peers, ±0.25% voltage regulation, 110-gal tank for 25+ hr runtime
60 kW standby · Diesel · Liquid-cooled
Mid-size portable power for construction, temporary power, and events needing 50-60 kW with low noise
56 kW prime diesel portable generator. Isuzu 4JJ1X engine with 67 dBA operation, Leroy Somer alternator, and 110-gallon tank.
Tier 4 Final3-phaseconstructionrental-fleet
Echo
Echo DGK70F
Patented SimulPhase — simultaneous single and three-phase output from one unit, eliminating step-down transformers on mixed-load sites.
61.6 kW standby · Diesel · Liquid-cooled
Mixed-load construction sites where SimulPhase eliminates transformer cost, and rental fleets discovering Shindaiwa heritage.
70 kVA portable diesel generator with SimulPhase technology. Built in Japan.
