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#1 |
Registered User
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
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1 MPG gain
One full tank of gas since I switched to an electric fan, this mod alone
saved me 1 MPG. So I went from 13.2mpg to 14.6mpg. Thought you all might like to know. Electric fan swap: http://67-72chevytrucks.com/vboard/s...d.php?t=187724 Truck info: 307V8, 2b carb, 3sp manual, 3.73 rear Driving: 35 miles per day in the lovely Bay Area traffic. Blech. Wasnt as big of an improvement as I might have hoped, but hell, its better than nothing, right?
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1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree Last edited by farside847; 02-16-2006 at 07:38 PM. |
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#2 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Re: 1 MPG gain
Just saved yourself $2.50 or more per fillup. If you fill up twice a week, that's $5 saved per week, $20 per month on average which nets you a free half a tank of gas or so, right?
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#3 |
Senior Member
Join Date: Feb 2004
Location: Ponca city now kingfisher Oklahoma
Posts: 1,221
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Re: 1 MPG gain
How did you set it up? Did you have to take off the fan shroud? Thermostat for the fans? How much did it cost to do this? I have a 6cy truck 3speed that I was going to put in a 8cyl and keep in the 6cyl positon so this would be good if I am going to use the short water pump. Pictures would be good to. You say 307. all stock 2bbl. Would HEI and a 4bbl help too since the primaries would be smaller?
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#4 |
Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
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Re: 1 MPG gain
That's good to hear.
That would get me 15 MPG I might consider that for my 84 DD. Now that I have done a cam swap I got the power band down low where I needed it the fule MPG is much better.
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1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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#5 |
Senior Member
Join Date: Jun 2001
Location: Shelbyville, KY
Posts: 3,269
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Re: 1 MPG gain
Switch from the 373 rear to a 307 and get a 4+mpg improvement on highway. It will also give your engine a extended life!! Switch to an overdrive transmission too and you will get another 3+mpg!! Just think, do all these modifications and you will put the arabs back into their tents!! hehehe
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#6 |
Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
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Re: 1 MPG gain
I think the 3:73 are doning great. The 3:07 tends to bog the motor down and loose MPG.
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1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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#7 |
Registered User
Join Date: Aug 2002
Location: Hickory, NC.
Posts: 776
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Re: 1 MPG gain
I went the 307/700r4/308 set up before, It wasn't pretty. I had a 70' swb driver. I put in a 307 out of another truck with low miles, still had the 2 barrel, put in a rebuilt 700. Motor ran great. Probably one of the best running motors I have ever had as far a being smooth and didn't use oil. Well on the open road The over drive with the 308 gear killed the poor little motor and I had to really mash it down to mantain speed on any kind of a hill. I shoulda kept the 373 gear. Live and learn. By the way I put the turbo 350 back in and with a super tuneup and driving like grandma, I pulled down 17.2 mpg with that heap.
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#8 |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: 1 MPG gain
Was the fan you removed a direct drive/flex or a clutch fan?
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#9 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,272
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Re: 1 MPG gain
I would like to see more of a 3 to 4 mpg improvement by going electric before I converted one. Obviously the electric fan will make a major improvement over one with the direct drive fan but I'm not so sure it will make that much difference over one with a properly operating oem clutch fan. I see mention of cfm ratings of the electrics. I have never seen mention of cfm ratings of the clutch type. Just how much air does the clutch fan pull? For a truck like farside's with no a/c his fan will probably do just fine, even in heavy traffic idleing but for the guys running power steering and a/c in summer heat they may have a problem with the single fan. There is at least one guy who installed a Lincoln mark8 fan setup. Sounds like it might be heavy duty enough. Anyone used the dual fan setup from the later model Chevy trucks yet?
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#10 |
Senior Member
Join Date: Feb 2004
Location: Ponca city now kingfisher Oklahoma
Posts: 1,221
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Re: 1 MPG gain
I'm thinking of this swap of fans, 305(80's HO Fbody) with rv cam, keeping the 3speed manual, and 3.08's. Maybe some mileage then.
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#11 |
Registered User
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
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Re: 1 MPG gain
Here is the thread of the fan setup.
http://67-72chevytrucks.com/vboard/s...d.php?t=187724 I had a manual (non-clutch) fan setup before.
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1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree |
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