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Old 05-15-2010, 05:43 PM
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how far will a tank of gas go?

my ratrod will have a basicly stock '72 truck 350, TH-350 with an 8.5" S10 ZR2 rear with 3.73 gears,and 25-26" tall rear tires on steel 14x6 S10 wheels, and it should weigh in under 2,500 lbs... questions arise, when I filled my gas tank ( converted 7 gal air tank ) up with vinegar ( clean out some rust b4 I treat it with sealant ) and it only took 6 3/4 gallons to fill it into the filler neck.. figuring sloshing, how far will a tank of gas go?.. If I figure 17 MPG, then it could go 102 miles figuring 6 gallons.. but is 17 MPG too high?
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Old 05-15-2010, 08:11 PM
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17 mpg might be a bit of a dream
60mph the engine will be turning around 3000 rpm with the 3 speed auto
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Old 05-15-2010, 08:44 PM
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well, I guess I'm going to consider an overdrive transmission.. that will get the RPM's under 2k@ 60 MPH figuring on a 225/70/14 ( 26.4" ) with a 700-R4.. should help with the MPG
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Old 05-15-2010, 08:46 PM
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17-20 is doable with a 700r4 and if the carb is turned correctly and depending on your right foot. what exactly is this going in?
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Old 05-15-2010, 08:51 PM
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Seems to me it would just be easier, and definately cheaper, to just put a bigger tank on it, 14 gallon or so minimum. Overdrive trans is a bit pricey if you are on a budget, takes a lot of miles for the overdrive to pay for itself in fuel savings.

I think 14 mpg would be a decent guess without overdrive, getting 2-3 mpg more will depend on how much work you put into tuning the carb and timing/vacuum advance.
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Old 05-15-2010, 09:17 PM
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Quote:
Originally Posted by va4cqd
17-20 is doable with a 700r4 and if the carb is turned correctly and depending on your right foot. what exactly is this going in?
this, when it's done of course
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Old 05-15-2010, 09:25 PM
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Quote:
Originally Posted by ericnova72
Seems to me it would just be easier, and definately cheaper, to just put a bigger tank on it, 14 gallon or so minimum. Overdrive trans is a bit pricey if you are on a budget, takes a lot of miles for the overdrive to pay for itself in fuel savings.

I think 14 mpg would be a decent guess without overdrive, getting 2-3 mpg more will depend on how much work you put into tuning the carb and timing/vacuum advance.
problem with a bigger tank is room, and cost.. as of right now, the tank I have, cost $20 4 years ago when I bought it as an air tank, and the weld in filler neck cost $20 IIRC.. so really, the tank will cost about $30 + the cost of the sender unit it will get.. the rear part of the frame is only 20" long, and I'v only got about 40" to work with in width, and I need room for the battery back there also... I'm really trying to save everywhere I can.. got the S10 Rally wheels because I had 2 as rollers for my '51 Chevy ( $9 each ), and $20 each for 2 more off Ebay so $60 got me a full set of wheels.. same with the gauge cluster was $50 off Ebay.. rear end. $41.50 at the U pull it and so on

I could live with 14 mpg, but could the engine live with 3k@60 MPH?
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Old 05-15-2010, 11:33 PM
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3,000 rpm at 60 mph is nothing to the engine, 1/2 of all musclecars were geared this way from the factory. Put a bigger diameter rear tire on it if you need to kill some gear later when it is on the road.

A bigger gas tank, even if you have to custom make it out of sheet or buy and adapt something cheap but bigger than what you have is still a bunch cheaper than an fresh OD Trans and converter by far.

That is the way I would do it, I'd only consider the OD stuff into a budget ride if I had a year to search for a solid used trans at a real deal price.

I guess after thinking about it I could probably live with 7 gallon tank with a mild pump gas engine, there will always be a station near enough to get to, but you will have to live with a bunch of stops. I was guilty of looking at it from too high a performance view, thinking like my stuff with race gas, you need a decent tank for that because of the lack of places to fuel up.
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Old 05-16-2010, 07:06 AM
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better tank ?

My son found a rectangular Hyd tank at the bone yard out of a Big dump truck.It was the perfect size to fit in between the frame rails on the Willys. He added the filler neck and sending unit/ fuel pickup -return stuff off the donor car. and since it had only had oil in it ther was NO rust inside. It holds about 16 gallons
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Old 05-16-2010, 07:38 AM
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I could regear it down to a 3.42 also.. I'm going to have an put an Eaton Posi in it. so it would be the perfect time for new gears..

but if 3k@ 60 will be ok, then I'll just stick with a TH-350.. even figuring 12 MPG, that's still 72 miles@ 6 gallons ( slosh factor ), and I may have room next to the battery for a 2-5 gallon stand up race fuel jug for long trips..
I have a GPS that has just about every gas station listed and programmed. I'll just have to use it to find routes with gas stations less than 72 miles apart and stop at every station I come across


I really can't use anything deeper than a spun aluminum or air tank type tank.. could be a bit longer, but not really much deeper.
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Old 05-16-2010, 08:22 AM
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that thing is going to have the aerodynamics of a brick. you might want to carry a 5gal gas can with you. IMHO however, because of the volatile gas situation and your need for a long-haul driver, i'd install a mildly cammed 283 and 273 gear with an overdrive trans. 25mpg is doable with that setup. currently, i'm installing a T 5 in my 62 truck with a 235 six. i'm hoping to get a solid 20mpg out of the beast.
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Old 05-16-2010, 08:36 AM
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mileage

Ha ha ha! even 14 is wishful thinking. I have 4:10's and 350cu in and a th350
with 31" tires and only get 10 mpg. Engine is stock w/high rise, 600 cfm holley. long tube headers and turbo's.
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Old 05-16-2010, 09:27 AM
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Man, I'd be afraid to use anything that wasn't designed and approved for containing motor fuel (gasoline)
The reason that you can't fill a tank to maximum capacity is thermal expansion. You'd have gasoline puking out on the pavement on a hot day.

I don't know what your frame width is ... 36" - ish??? but here is one idea.
You also know that a sending unit *will* fit, and that it will more accurately read the contents of the tank it was designed for.

If you wanted a *really big tank* a

late 70's suburban offers 3 sizes of tanks that sit between the frame rails.
This one is the smallest, and it's 25 US gal.


Quote:
US Gallon : 25.0
Liter : 95.0
Size : 28 3/4" x 28 1/8" x 10 3/4"
Strap Set : ST12
Kit No : LO01
Comments : SMALL FILLER PIPE 1 1/4 " I.D.
Another option might be:



1968 Ford Fairlane (Torino)

Very easy to mount with a top flange. These tanks actually doubled as the trunk floor.

Quote:
US Gallon : 20.0
Liter : 75.0
Size : 30 1/2" x 36" x 8 1/2"
Strap Set :
Kit No : LO03
Comments : W/ DRAIN PLUG; (6 1/8'' FILLER NECK)
One thing to keep in mind is the different OHM readings used by different mfr's. GM senders are 0-90 ohm, and I think the Ford ones are 80-10 ohm. Your guage on the dash would have to match.

Get your measurements and browse that catalog. I'd be looking for something that they also list straps, senders, and maybe even filler hose connectors.
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Old 05-16-2010, 09:41 AM
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Another option might be to take it to events on a trailer.

Relax... I'm just kidding! LOL! :-)~
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Old 05-16-2010, 09:43 AM
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how much do you think I could sell this air tank gas tank for? I'll clean it up, paint it, and put dome gas tank sealent in it and make sure it's leak free by water testing of course.. it's got vinagar in it right now cleaning the surface rust it got from sitting open...

then I could get 2 of these , and put them lengthways in the bed with the battery in the center of them, or opposite side.. being B/N it wouldn't be hard to weld on mounting tabs, epoxy the cap vents shut and use a couple roll over valves.. can also get sending units that can fit them... more expensive way of doing it, but I think they would look pretty retro in it, as well as increase the capacity.
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