6.5L V8 Detroit Diesel Engine Specs

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6.5L V8 Detroit Diesel Engine Specs

6.5L V8 Detroit Diesel Engine Overview

This engine is produce to be the replacement of 6.2L diesel engine, the engine that named with 6.5L V8 Detroit Diesel Engine first launch in 1992. Tones of improvement also added on this engine, currently there are various model engines are produce under this  6.5L V8 Detroit Diesel Engine types, the engine was consist of below detailed engine code ( Engine RPO Codes) version

  • 6.5L V8 Detroit Diesel Engine L49, naturally aspirated
  • 6.5L V8 Detroit Diesel Engine L56, Completed with Turbocharged, emissions controlled (EGR & catalytic converters, used in all light duty 1/2 & 3/4 ton trucks
  • 6.5L V8 Detroit Diesel Engine L57, Naturally Aspirated engine for HO or heavy duty purpose
  • 6.5L V8 Detroit Diesel Engine L65, Completed with Turbocharged. Used in all heavy duty 3/4 & 1 ton trucks
  • 6.5L V8 Detroit Diesel Engine LQM, It has power 175 HP
  • 6.5L V8 Detroit Diesel Engine LQN, It has power 190 HP

 Looking back on the improvement item of this 6.5L V8 Detroit Diesel Engine, almost of this engine codes are completed with a turbocharged. Rather than be the others diesel engine contender in case of power and torque, this engine is more focused to achieved decent fuel economy and met emissions standards in half-ton trucks. That strategy was actually take by used a 6.5-specific Stanadyne DB-2 mechanical injection pump at 1992- 1993 engine models, replaced the DB-2 with the electronic throttle DS-4 in 1994-2000 vehicles, implemented a redesigned 6.5L V8 Detroit Diesel cooling system incorporating twin non bypass-blocking thermostats and a 130 GPM water pump in middle of 1996. Currently this engine already replace with Duramax 6600 engine but until today this engine is still using in military applications by AM General.

6.5L V8 Detroit Diesel Specs

Although this engine is consist of various engine code with each specialization of specification but commonly all of 6.5L V8 Detroit Diesel Engine is using below specification data. Here they are common specification of 6.5L V8 Detroit Diesel Engine

Specs Item Specs
Engine Type 6.5L V8 Diesel Engine
Engine Code L49, L56, L57, L65, LQM, LQN
Valvetrain OHV 2-V
Displacement 6,500 cc ( 395 cu in)
Transmission Type Available for auto and manual transmission
Compression Ratio Early series 21.3:1 , Late series 20.3:1, AMG/GEP Marine 18:1
Bore and Stroke (in.) 4.06 x 3.82
Cylinder configuration V-8
Aspiration Turbocharged & naturally asprirated versions available.
Injection IDI (indirect injection)
Maximum engine speed 3,400 rpm
Horsepower(SAE net@rpm) Introductory: 180 HP @ 3,400 RPM

Peak: 215 HP @ 3,200 RPM

Torque (lb. ft. @ rpm) Introductory: 360 HP @ 1,700 RPM

Peak: 440 lb-ft. @ 1,800 RPM

Cylinder block material Cast Iron
Cylinder head material Cast Iron
Reputations Outperformed by Dodge & Ford. Capable of respectable fuel economy. Somewhat problematic depending on version of engine

6.5L V8 Detroit Diesel Engine Applications

This 6.5L V8 Detroit Diesel Engine is using at following vehicles list

  • 1994 – 1999 Chevy Blazer/ 2-door Tahoe / GMC Yukon/Chevy K-2500,K-3500
  • 1992 – 1999 Chevrolet Suburban / GMC Suburban
  • 1992 – 1999 Chevrolet and GMC C/K
  • 2000 Chevrolet and GMC C/K 2500 & 3500
  • 2001 Chevrolet and GMC C/K 3500
  • 1994 – 2004 AM General Hummer H1
  • 1994–present AM General HMMWV (Currently called as the 6500 Optimizer).

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