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Thread: Max fuel economy?

  1. #161
    Join Date
    Mar 2008
    Location
    Peoria, IL
    Posts
    80

    Default

    Wow!

    I thought I was doing good in my Duramax, but some of you guys have sure got me beat.

    I've gotten a whole bunch of tanks around 25 mpg, and have flirted with 30 mpg on a couple trips, but I really gotta watch how I drive to get that.

    Sounds like the right 6.2 in the right truck with the right gearing can beat that without even trying.
    2002 LB7 2500 CC LB 4x4 80k
    6 spd, 3.73, 265's

  2. #162

    Default

    Im getting 25.3 MPG in my suburban
    1985 Chevrolet suburban k10 4x4. 6.2 diesel. 700r4 3.73 gears

    1987 K5 blazer 6.2 diesel. 4x4 SM465 NP208 4.11 gears and 31" tires.

    "the cop asked me " Do you know why Im pulling you over"?
    I said "Yeah". The cop then asked "why"? I said " Because you have a gun, a faster car, a radio, lots of friends with radios, pepper spray and handcuffs". "

  3. #163
    Join Date
    Mar 2011
    Posts
    4

    Default Question

    Hey guys I have a question. I found a short bed 1985 two wheel drive. The body is rust free with the standard oxidization on the paint causing fading. The truck is a second owner with 155k on it. The tranny is a factory rebuild with 30K on it. The truck runs but I have not driven it yet. Someone told me the 2 wheel drive short beds with the 6.2 were rare. Always been a gas man so I need some info. from the pros. I can get it for $1000.00 dollars. This seems good to me, what do you think? How much is it worth and are these good motors. What should I look out for? Any insight would be helpful.

  4. #164
    Join Date
    Sep 2006
    Posts
    363

    Default

    Quote Originally Posted by T-1000 View Post
    Hey guys I have a question. I found a short bed 1985 two wheel drive. The body is rust free with the standard oxidization on the paint causing fading. The truck is a second owner with 155k on it. The tranny is a factory rebuild with 30K on it. The truck runs but I have not driven it yet. Someone told me the 2 wheel drive short beds with the 6.2 were rare. Always been a gas man so I need some info. from the pros. I can get it for $1000.00 dollars. This seems good to me, what do you think? How much is it worth and are these good motors. What should I look out for? Any insight would be helpful.
    If it doesn't have rust and the body is in good condition, this is a excellent buy even if it doesn't run. The 6.2 diesel motor is excellent for what it was designed for. It was designed as a light weight diesel engine to provide excellent fuel economy. In 1982, the engine put out 130 hp and with the right setup, would return fuel economy readings of mid to upper 20's. And with the stock power output, it was reliable as well. However, trying to get more power out of the unit often is asking for trouble. At that point, the Cummins 6BT is probably better suited for making lots or power and still being reliable.
    1990 ¾ ton 4x4 Chevy Suburban
    -Cummins Diesel - 12 valve - factory rebuilt
    -6 speed bullet proof manual transmission - NV5600
    -Gear Vendors Overdrive
    -Upgraded Holset HX-35 turbo
    -NP205 iron transfer case
    -3.73 gears

    1982 ½ ton Chevy Suburban
    -6.2L diesel - high nickle crack free 1982 block
    -Stans headers
    -Ported heads
    -Timing gear
    -4 speed automatic
    -3.08 gears
    -30 mpg on freeway

  5. #165
    Join Date
    Mar 2011
    Posts
    4

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    Thanks for the info. Going to drive it this week. I think $1000 is pretty good from what I have heard.

  6. #166
    Join Date
    Mar 2010
    Posts
    14

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    Great info Edahall, I tried to PM you but I did not see the option to in this forum. If you could email me or something that'd be great! surfphotosd at gmail dot com.

    Thanks again!

    Quote Originally Posted by Edahall View Post
    Here’s what I did to get 30 mpg (US) on my 82 Suburban.

    1. I used 1982 heads with small pre-combustion chambers and large valves. These heads get the best gas mileage but suffered from cracking. Of course mine had cracks in between every valve seat so I installed liners between each valve seat.
    2. Ported / polished the heads
    3. Stan’s Headers – Made a big difference in power since stock power was 130 hp
    4. Free flowing exhaust – Dual 2-1/2” with H-pipe and Thrush tube mufflers.
    5. DSG Timing Gear
    6. Ported / polished J code intake manifold
    7. 700R4 automatic with overdrive
    8. 3.08 rear end
    9. Tall & skinny tires – 30x9.50 with 50 psi of pressure

    And of course, the most important, an easy foot. To achieve 30 mpg, I have to keep it under 60 mph. Over that, it drops off rapidly with the square front end on the Suburban. For example at 75, it’ll drop down to about 23 mpg. The 75 mph gas mileage can be increased considerably with aero mods but I rarely drive that speed so I have not done any aero mods on my Suburban.

    >> Unfortunately because of CA dmv I cannot do a Cummins swap.
    I don’t believe the 88 Jeep Grand Wagoneer was ever offered with a diesel in the U.S. So technically, CA DMV won’t allow installing any diesel. However, if you push the right buttons, I believe you can get it through even with a Cummins. PM me if you’re serious about doing this swap and I’ll tell you how.

  7. #167
    Join Date
    Aug 2006
    Location
    Edmonton Alberta, Canada
    Posts
    52

    Default 82 heads

    My diesel page books are packed away right now and I trying to remember when GM changed the head/precup design I have an 86, are they different from the 82 heads by much???

  8. #168
    Join Date
    Aug 2011
    Location
    Millinocket Maine
    Posts
    205

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    Quote Originally Posted by jMedia View Post
    Great info Edahall, I tried to PM you but I did not see the option to in this forum. If you could email me or something that'd be great! surfphotosd at gmail dot com.

    Thanks again!
    I just read this post on the 6.2 fuel economy I will keep it in mind very helpfull thanks
    Vince

  9. #169

    Default

    What about machining an adapter to use an electrically controlled fan clutch such as this. http://www.summitracing.com/parts/HDA-3264/

    You would just wire it through an electric fan switch and thermocouple. It wouldn't pull nearly the amps as an electric fan, and you could possibly pull as much CFM through the radiator as the stock fan. The plus would be almost zero parasitic drag from the fan clutch. The guys on the Cummins pages also install switches to activate them while in traffic to keep air flowing through the A/C condenser. What do you guys think? Maybe worth a few MPG's?
    1982 K10 SWB 6.2NA 4x4, In sad shape-Saved by john8662
    1971 AMG M35A2 LDT-465 D-Turbo 6x6

  10. #170
    Join Date
    Jun 2012
    Location
    Virginia, USA
    Posts
    22

    Default 6.2 Fuel Economy

    Lots of interesting replies in this thread -- I am considering a 6.2L diesel swap for my GMC Safari van... I use it in my taxi business... 84Blazer mentioned a cabbie talking about gasoline costs and wondered why GM never built 6.5 diesel Caprices for taxi specials... #1 Reason - EPA's EcoNazis and the rest of the tree-hugging, earth-worshipping yuppie world.

    Truth be told, quite a few (number unknown) FBI fleet-package Impalas were factory fitted with either the 5.7 Olds or the 6.2 Detroit somewhere around 80-84. My guess would be that leftover warranty 5.7s went first... One of these cars is on YouTube.

    I had been considering a swap using a 3.9L Isuzu NPR truck engine, but plans tend to change when your bread and butter unexpectedly dies, and you have to get creative.

    It actually seems the 6.2 will actually be a better/easier swap than a 3.9L Isuzu. No trans adapters required, uses standard Chevrolet engine mounts, and no electronic or emissions BS like the 4.3 V6 I currently have.

    Truthfully, from my research, I wouldn't be scared to use a 4.3 V6 Oldsmobile diesel (they were the best of the three, having 14 head bolts) with a 200-4R or 700-R4 automatic overdrive.... but these diesels are hard to find, and I already have a 6.2.
    James Collier

    1998 GMC Safari (Dead and awaiting resurrection with a 6.2 diesel swap)
    1984 Buick Regal (On the back burner)

    "Don't worry what others think... they don't do it that often!"

    Check out my original music recordings on FB, YT and MS

    "Allergic To Air Music"

  11. #171
    Join Date
    Nov 2012
    Location
    Florida
    Posts
    2

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    I get 40 mpg out of a 6.2 diesel non turbo engine. I put the engine in a camaro, installed a 700r4 with lockup torque converter and put a 2.73 rear gear.

    I love this car, it is fast, great fuel mileage on the highway and the most fun car I ever drove.



    http://www.youtube.com/watch?v=m6W5D...IiTg9w&index=6

  12. #172
    Join Date
    Feb 2000
    Location
    Montana
    Posts
    11,382

    Arrow

    Cool! Looks like it fits beneath the hood quite well. Amazing what a lightweight and aerodynamic vehicle can do with a 6.2 for fuel economy.

    I like the radio commentary playing in the background of your video....

    Welcome to the board.

    Jim

  13. #173
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Thumbs up

    VERY nice! Thanks for sharing.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  14. #174
    Join Date
    Jun 2013
    Location
    Northern Ct
    Posts
    224

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    I like a guy with an imagination. Very clean looking install. I can hear the purists on the Camaro forums now. . You must be a very patient and inquisitive individual. I nominate you for the Nobel Peace prize. Or maybe an Oscar...(or something like that). What's next? Walking a tight-rope over the Grand Canyon?
    Old habits, die hard.

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