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6.2L Diesel 1982-93 6.2L Diesel - Member access forum for any questions or information exchange related to the 6.2L engine.

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  #1  
Old 12-18-2004, 12:53 PM
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If you were building an engine for maximum fuel economy, which would you choose?

1- A non-turbo 6.2L.
2- A TD 6.2L.
3- A non-turbo 6.5L.
4- A TD 6.5L.

I'll add more later, but I wanted you guys to think about fuel economy and what it takes to get it.

MP
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Old 12-18-2004, 01:22 PM
john8662
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This is purely based on my 86 pickup. Non turbo, with C series calibrated injection pump truck geared with 3.08 and 700 trans.

I vote for Non turbo 6.2L

I'ts all in the gears and a light right foot
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Old 12-18-2004, 01:48 PM
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My first answer would be N/A 6.2L, but....
There are too many variables.

What vehicle will it be in? 1/2, 3/4, 1 ton? Pickup? SUV? Other?
What type of driving is to be expected?
Towing?
Drivetrain requirements?
Power requirements?
On/off highway?
Driving habits?
Speed expectations?

The list could go on.
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Old 12-18-2004, 03:08 PM
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The vehicle will be a factor in answering the question as to which engine produces the best fuel economy. Also, part of the fuel economy equation is determining the intended use. We'll talk about all aspects....

Was this a trick question?

MP
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Old 12-18-2004, 05:02 PM
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I would use a NA 6.2J stuffed in an 80 Olds Cutlass with a 700R4 and a rear gear ratio tuned for 1700 RPM at 70 MPH.
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Old 12-18-2004, 06:07 PM
dieseldummy
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I would say it doesn't matter what engine. My answer is any engine with the IP calibrated to only deliver XXmm3 of fuel. Then it can only burn so much fuel as well as only have so much attanable HP.
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Old 12-18-2004, 06:36 PM
catmandoo
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well just from my experiences,my old 84 c10 with 6.2 and 700r4would run about 25-26mpg,and my 92 c1500 with n/a 6.5 with nv4500 ran a high of 27mpg on a half dozen occasions.i have since put my banks turbo on it and turned the pump up and man lots more power,yet i have still pulled 27 on occasion.they both use 3:08 gears.so if i had to chose i would probably go 6.2 with the 4500.but i really don't think it will be much more,i've been thinking of a way to hit 30mpg.but just haven't got there yet.
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Old 12-18-2004, 08:55 PM
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lots of compression, hardly any fuel delivery, small T3 based exhaust housing and wheel with about 6 pounds of boost from a T04 H3 inlet wheel. That's enough inlet air for around 180 hp, yet fuel delivery would probably be around a stock 135-140 hp c code engine. Wouldn't matter which engine as long as it had the correct pre-chambers. I'd also put it in one of our out of date bodied craftsman trucks......could weigh in at just over 3K pounds. And it deffinately needs a T56 from a late model camaro or firebird.
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Old 12-19-2004, 10:40 AM
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There are 3 or more scenarios that we'll discuss concerning engine/vehicle requirements and maximum fuel economy.

1- Scenario #1 - Fuel economy supercedes all other prorities for your fullsize street legal pickup/Suburban.

2- Scenario #2- You run at 75-mph on the Interstate most of the time in your pickup/Suburban without a load.

3- Scenario #3- You use your pickup/Suburban for all sorts of family and work related driving, including towing the 7K family travel-trailer a few times a year.

MP
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Old 12-19-2004, 11:43 AM
NH2112
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Well for scenario #2 I'd use a 1/2 ton with OD tranny and gear it so that when in OD and at cruising speed I'm turning about 1800rpm. That would put you at about 55-60mph when turning 1800rpm in direct so your mileage while not on the interstate wouldn't suffer too badly.
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