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#26 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: 6.2 Diesel vs SBC
almost every gas station has it now, but sometimes ,diesel can be hard to find
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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#27 |
Registered User
Join Date: May 2011
Location: Goliad, TX
Posts: 672
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Re: 6.2 Diesel vs SBC
Diesel is about 30 cents more per gallon here in Texas. Several months ago, it was 70 cents more per gallon.
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1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift |
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#28 |
Registered User
Join Date: May 2011
Location: Goliad, TX
Posts: 672
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Re: 6.2 Diesel vs SBC
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#29 |
Canadian Trucker
Join Date: Nov 2010
Location: Sarnia, ont canada
Posts: 648
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Re: 6.2 Diesel vs SBC
Thats six cents a litre, we are about 24-30 cent cheaper on average per gallon.
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![]() 2020 Silverado Trail Boss - 6.2/10spd |
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#30 |
Registered User
Join Date: Dec 2011
Location: Elkhart, IN
Posts: 1,308
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Re: 6.2 Diesel vs SBC
Either way it's still not cheap.
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1985 Chevrolet K10 Custom Deluxe---SOLD 1997 Ram 2500 5.9 Cummins 1985 Chevrolet Camaro Z28 1987 Chevrolet K10 Silverado "The Beast" build 1987 Silverado http://67-72chevytrucks.com/vboard/s...=1#post6150257 |
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#31 |
Just here to tinker
![]() Join Date: Jun 2008
Location: Holland, MI
Posts: 3,692
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Re: 6.2 Diesel vs SBC
Must be nice. Diesel here is on average 10 cents higher per litre. That's 40 cents more per gallon than regular gas.
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78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725 |
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#32 | |
Registered User
Join Date: Dec 2007
Location: Palmer, Alaska
Posts: 13,821
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Re: 6.2 Diesel vs SBC
Quote:
If so, that has not been my experience with either of my 6.2's One is a K20 Burb, One is a V3500 crew cab long bed. They both run 75 mph on the highway, no problem. I haven't towed anything very heavy with either one though so I can't be much help on the towing aspect... Posted via Mobile Device
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#33 | |
Registered User
Join Date: May 2011
Location: Goliad, TX
Posts: 672
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Re: 6.2 Diesel vs SBC
Quote:
However, keep in mind my 1982 Suburban with the 6.2L had 3.08 gears and only 130 hp. However, it would get 25 mpg all day long. After the headers and exhaust, I could maintain 70 mph up that same grade in 3rd gear. Later on, power became a priority over fuel economy and GM increased power output on these 6.2L engines by using larger precombustion chambers in the heads. Power output did increase but at the expense of fuel economy. I suspect that your K20 Burb and V3500 have the larger precombustion. chambers which do help with power.
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1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift |
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#34 | |
Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
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Re: 6.2 Diesel vs SBC
Quote:
So....."they" really can't switch it over in "a day or two?" That was mah point; Don't just look at mpg figures. Look at the total cost of going diesel and how long it will take for it to pay itself back. i think you'll find in most cases gas is the better route. |
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#35 |
Registered User
Join Date: May 2005
Location: evington,va
Posts: 1,200
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Re: 6.2 Diesel vs SBC
Ok I personally just got done converting my 91 sub from gas to diesel . The fuel maybe be a little higher but the fuel mileage will pay for it self . An as far as time goes I took to sub pulled all the wiring front to back changed all fuel lines hydro boost steering colomun an steering box an done about all of it within a week with just me 1 person so two days or so a couple guys should be able to do it . With a good knowledge of Chevys
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#36 | |
Registered User
Join Date: Dec 2007
Location: Palmer, Alaska
Posts: 13,821
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Re: 6.2 Diesel vs SBC
Quote:
The V3500 is a 91 so it has the highest rated 6.2 in it. The K20 is a 84, I'd have to look up the rating on it. Both of them are J code also. Posted via Mobile Device
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#37 |
Registered User
Join Date: Dec 2011
Location: Elkhart, IN
Posts: 1,308
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Re: 6.2 Diesel vs SBC
Okay thanks for the input guys, but it really doesn't matter anymore we just bought a Dodge Cummins yesterday, so thanks for all your input.
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1985 Chevrolet K10 Custom Deluxe---SOLD 1997 Ram 2500 5.9 Cummins 1985 Chevrolet Camaro Z28 1987 Chevrolet K10 Silverado "The Beast" build 1987 Silverado http://67-72chevytrucks.com/vboard/s...=1#post6150257 |
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#38 | |
Registered User
Join Date: Sep 2009
Location: Weare,NH
Posts: 1,592
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Re: 6.2 Diesel vs SBC
Quote:
My gf and I stopped at a local dealership the other, they had a rusty 89 4x4 crew cab dually sitting at the back of the lot. She was all ready to walk into the dealer and make them a lowball offer for the "big awesome truck", I pointed out that it was a 454 and gas mileage would be an issue. So now she wants a turbo diesel Chevy, since I told her that truck with a 6.2 would get double the mileage. Women are crazy. haha |
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#39 |
Registered User
Join Date: May 2011
Location: Goliad, TX
Posts: 672
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Re: 6.2 Diesel vs SBC
What year Dodge Cummins? Auto or manual transmission?
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1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift |
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#40 |
Registered User
![]() Join Date: Oct 2006
Location: Southern Kalifornia
Posts: 3,066
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Re: 6.2 Diesel vs SBC
I know you just got a cummins, but remember, with a diesel (most earlier ones anyway) can be set up to run on waste oil,motor oil, fry oils,kerosene,etc... GAS CANNOT! So if you have a natural disaster in your area and need to bug out NOW, a diesel will serve you WAY better than gas.
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------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT |
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#41 | |
Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
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Re: 6.2 Diesel vs SBC
Quote:
Describe ALL steps in great detail in order. |
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#42 |
Registered User
Join Date: Dec 2010
Location: Livermore, CA
Posts: 82
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Re: 6.2 Diesel vs SBC
Diesel will be my choice. It's a 1 ton truck, not a top fuel dragster. I don't need to go fast stoplight to stoplight, and I'd much rather get 17-18mpg than 8-10.
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#43 |
I know the pieces fit
Join Date: Nov 2007
Location: MONTGOMERY, AL
Posts: 5,523
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Re: 6.2 Diesel vs SBC
Another thing to consider, the turbo parts off a 6.5 are bolt-on. I got all the parts used for around $600. I'll still have to get a crossover and downpipe made but it's not a difficult job bolting the stuff on.
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#44 |
Registered User
Join Date: Dec 2010
Location: Pittsburgh, PA
Posts: 1,009
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Re: 6.2 Diesel vs SBC
If you have AC in the truck, it won't clear the box though. Keep that in mind.
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Steve Member of the Foot Pedal Club '83 Chevy K20: 6" Rough Country, 3" Performance Accessories BL, Bushwacker Cutouts, 38x15.50 Mickey Thompson Baja Claws, 350 HP 350 crate engine from Jegs, Turbo 400 ![]() |
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#45 | |
Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: 6.2 Diesel vs SBC
Quote:
I only like the diesels if they are turbo charged, otherwise I have no interest. If you are going to spend the money, why not make what you have more efficient? Or go with a more efficient gas swap? Don't get me wrong, I like the diesel swaps if it's a turbo, I'm just not liking the diesel gas prices at 30-40 cents more per gallon when you consider you are paying more for a fuel that is unrefined, doesn't make sense. But the fun you can have with simple tuning on a turbo diesel makes it worthwhile ![]() Personally I went with a LS 6.0 swap and a 4L60E behind it for my blazer, and I'm getting 22 mpg with this setup, and it has more usable pulling power than a gen 1 sbc or any non turbo 6.2 diesel. There is good gas mileage to be had with gas powered engines if you science out the entire setup. I was in the same dilema with my 79 1 ton pickup. The 454 spun a bearing. I would have loved a turbo diesel swap in this, but the time and effort and money was holding me back. I instead dropped a GM 502 crate engine down in it (cheaper and easier). It has all the power I need (dyno'd 537 ft lbs.) and gets 14 mpg driving easy. Granted whether towing or not I don't get the mileage a turbo diesel truck does however, but it's not bad for a big inch engine in a truck shaped like a brick. Considering it makes the same power the GM duramax did circa 02-03 (a few years ago now) makes it a pretty fun truck to drive. What I'm getting at is, I don't think you are weighing all your options that are available to you ![]() |
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#46 |
Registered User
Join Date: May 2011
Location: Goliad, TX
Posts: 672
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Re: 6.2 Diesel vs SBC
Also, keep in mind that engine longevity often takes a dump when adding a turbo to these 6.2L engines. The compression ratio is too high and bottom end is too weak to support enough boost to make lots of power. You can get by with about 8 psi of boost but more than that, you're just asking for trouble on these engines.
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#47 | |
Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: 6.2 Diesel vs SBC
Quote:
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