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Old 04-01-2011, 07:58 PM   eBay Motors  #1 (permalink)
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7.8l

I didn't know where to put this thread so i stuck it here. Our shop has a 6500 flatbed with a 7.8l duramax in it. To tell you the truth it is kind of gutless. We are looking at our options on getting some more power into it. If someone ahead of you is doing 45 or 50 in a 55 we don't even have enough power to get up and pass them with out using up a mile of road. Anybody know anything about these motors and what the best route would be. It has to stay reliable being a tow truck. Thanks for any input.
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Old 04-01-2011, 08:42 PM   eBay Motors  #2 (permalink)
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Duramax's only are 6.6L
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Old 04-01-2011, 08:46 PM   eBay Motors  #3 (permalink)
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isuzu makes an inline 6 7.8L truck motor
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Old 04-01-2011, 08:52 PM   eBay Motors  #4 (permalink)
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Yea they came in the 06 and up 6500,7500 and so on. I believe it is 210 hp and 520 on the torque. But not sure what you can di for performance.
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Old 04-01-2011, 08:53 PM   eBay Motors  #5 (permalink)
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Duramax DOES make an Inline 6 and i believe it is the 7.8 and it IS VERY Gutless.. not sure on hp improvements.. but it is a duramax designation from Isuzu
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Old 04-01-2011, 08:55 PM   eBay Motors  #6 (permalink)
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arent dmax made by isuzu?
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Old 04-01-2011, 08:55 PM   eBay Motors  #7 (permalink)
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Duramax 7800 - 200 HP Version

Duramax Diesel 7800 Specifications

Duramax 7800 200 Horsepower
Displacement 7.8 Liters / 475.9 Cubic Inches
# of Cylinders 6 In Line
Bore 4.53 Inches
Stroke 4.92 Inches
Compression Ratio 16.0 : 1
Dry Weight 1180 pounds
Fuel Grade # 2 Diesel
Engine Power 200 HP @ 2200 RPM
Torque 520 pound Feet @ 1450 RPM
Governed full load setting 2400 RPM
No Load Governing speed 2550 RPM
Low-Idle, Curb Idle 600 RPM
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Old 04-01-2011, 08:56 PM   eBay Motors  #8 (permalink)
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Duramax 7800 High Torque - 275 HP Version

This engine uses the exact same displacement and compression ratio as listed above, and has the same fuel grade requirements. It is tuned to produce the power ratings shown below.

Engine Power 275 HP @ 2200 RPM
Torque 860 Pound feet @ 1450 RPM

The Governed full load setting, no load governing speed, and curb idle remain the same as the 200 Hp Version listed above. The power range includes 200, 215, 230, 250, and the High Torque 275 Horsepower versions.
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Old 04-01-2011, 08:59 PM   eBay Motors  #9 (permalink)
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Yes Duramax is made by isuzu the U.S gov set out for a clean burning diesel and what they got was 60% Japan Isuzu and 40% GM/Gov aka "Duramax".. and 110% BadA** Mofo diesel engine!!!!
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Old 04-01-2011, 09:01 PM   eBay Motors  #10 (permalink)
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many of the employees were able to transfer to the new joint venture named, DMAX Ltd., signifying the Diesel engine and maximum power, cleanliness and fuel economy.

So after many meetings and discussions with Chevrolet Truck and GMC’s marketing, the name: Duramax Diesel 6600 was agreed upon. “Duramax” was meant to highlight the durability and reliability of the new engine

and for all the Cummins guys and Powerstroke/navistar fellows... Isuzu has been producing diesel engines since 1934 i believe.. Very long time..
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