John Deere 6081H
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| John Deere Power Systems 6081H | |
| Manufacturer: | John Deere Power Systems |
| Introduced: | Early-1996 |
| Discontinued: | December 31st, 2007 |
The John Deere Power Systems 6081H was a compressed natural gas (CNG) engine developed and manufactured by John Deere Power Systems for on-highway applications. Major applications included Blue Bird & Thomas Built Buses school buses, as well as ElDorado National, New Flyer, and Orion transit buses.
The engine was discontinued in December 2007 in conjunction with John Deere's departure from the on-highway market.
Construction
The 6081H features a cast iron alloy, non-siamese bore engine block, cast iron slab-style 2-valve cylinder heads, centrifugal-cast wet liner cylinder liners, chill hardened cast iron crankshaft & camshaft, forged steel alloy I-beam taper top connecting rods, and electronic throttle control.
Specifications
6081H-250
| Engine displacement |
Years | Cylinders | Cylinder bore | Piston stroke | Compression ratio | Idle speed | Power Output | Torque Output |
|---|---|---|---|---|---|---|---|---|
| 8.1L (496 cu. in.) | 1996-2007 | 6 | 4.56" (116mm) | 5.06" (129mm) | 11:1 | 750rpm | 250hp @ 2200rpm | 735lb-ft @ 1300rpm |
6081H-275
| Engine displacement |
Years | Cylinders | Cylinder bore | Piston stroke | Compression ratio | Idle speed | Power Output | Torque Output |
|---|---|---|---|---|---|---|---|---|
| 8.1L (496 cu. in.) | 2002-2007 | 6 | 4.56" (116mm) | 5.06" (129mm) | 11:1 | 750rpm | 275hp @ 2200rpm | 800lb-ft @ 1400rpm |
6081H-280
| Engine displacement |
Years | Cylinders | Cylinder bore | Piston stroke | Compression ratio | Idle speed | Power Output | Torque Output |
|---|---|---|---|---|---|---|---|---|
| 8.1L (496 cu. in.) | 2001-2007 | 6 | 4.56" (116mm) | 5.06" (129mm) | 11:1 | 750rpm | 280hp @ 2200rpm | 900lb-ft @ 1500rpm |
All specifications listed above were current as of August 2003, from the last iteration of the 6081H offered until 2007.
References
- WMATA: Compressed Natural Gas Transit Bus Evaluation, April 2006
- USDOE, Office of Transportation Technology; Heavy Vehicle and Engine Resource Guide, December 2001
- JDPS DSWDC04, 6081H-250hp Spec Sheet; August 2003
- JDPS DSWDC06, 6081H-275hp Spec Sheet; August 2003
- JDPS DSWDC07, 6081H-280hp Spec Sheet; August 2003
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