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I think because of the heavy thickness of the material in which they are fabricated, saddle tanks should be better then a lot of the other "sheet metal" style stock tanks. There are an awful lot of saddle tanks being used commercially.
Why is it not good for street use? does gas not react well with aluminum?
No, aluminum will burn just fine in the presence of gas.
Gasoline has a tendency to form a vapor pool and heartily ignite when rapidly dumped onto a hot roadbed or even exhaust with minor ignition sources in the vicinity. Diesel, not so much.
You could say that gasoline's flammable but diesel's inflammable.
But, that could be confusing.
I don't believe that you will find aluminum tanks rated for gas, only diesel. However, you can buy the round tanks in steel, which is probably what is on the truck in the photo, that are rated for gasoline.
As far as the safety factor of that type tank mounted like that, they are no less susceptible than the older chebys that had the tanks mounted outside the frame rails. Actually, these would be much safer.
As far as the safety factor of that type tank mounted like that, they are no less susceptible than the older chebys that had the tanks mounted outside the frame rails. Actually, these would be much safer.
Don't forget the '53-'55 fords are outside the frame rails as well. They're stuck under the driver's side of the cab.
I don't believe that you will find aluminum tanks rated for gas, only diesel. However, you can buy the round tanks in steel, which is probably what is on the truck in the photo, that are rated for gasoline.
As far as the safety factor of that type tank mounted like that, they are no less susceptible than the older chebys that had the tanks mounted outside the frame rails. Actually, these would be much safer.
"Out of site, out of mind" comes to mind when I hear a comparison between the saddle tanks and the other tanks mentioned. I doubt the rocker panels gave much protection in a crash at any kind of real speed. Maybe they do if it's just a low speed connection but a hit at 30+ mph I don't think there'd be much difference.
That being typed, I'm no engineer, it's just my opinion which isn't worth much.
I was thinking of going with Schedule 10 or 20 steel pipe. That works out at around a 1/4" or better. I would think that would be a lot more protection then the stock sheet metal tanks and running boards.