Daily Archives: March 1, 2017

How big a gas tank

Yesterday I did some measuring and calculating to figure out how much fuel capacity I could have and still clear everything. Turns out it is quite a lot.

The space between the front firewall of the body and the back of the nose is a straight continuation of the firewall. This will make constructing the covers of this area much easier, and makes things like steering and the gas tank much easier to fit. Anyway I know the steering box is just under 4.5″ wide from the mounting flange that fits on the inside of the frame rail, and I want the outflow air from the radiator to exit on both sides of the tank so we have a maximum width of 27″ (firewall edge) minus 3 (two frame rails) minus 9 (steering box on left and symmetrical space on the right) for a total width of 15″. The front axle is 25″ from the firewall, minus 7.5″ for steering linkage rounded to 8 for the slight shortening of the wheelbase caused by travel from the design ride height so 17″ long. The firewall is 22″ tall in the center but only 19″ at the point the top panel of the hood joins the sides so 19″ tall. Multiplying all this out gives me 4845 cubic inches of fuel or 21 gallons.

The donor minivan would make a roughly 300 mile trip on about 16 gallons so 21 will still give adequate range even with the change to e85. This is not even considering the difference in drag between the minivan and the hot rod, the hot rod being narrower, about 2 feet shorter, and much less bluff than the minivan. And also not forgetting the difference in weight for going up hills, the hot rod will be about 1500 pounds empty compared to the advertised 3900 empty weight of the minivan, so the hot rod should have much better fuel economy than the donor minivan.

In other news I have a trip to the lab rat keeper in the morning, so no food until after the visit (because for some reason they are tracking my cholesterol on this trial). And I’ll get the latest Squirrel Girl on the way back and pay my phone and the storage unit, so lots of walking and time on the bus to go with starvation.😜

Billed @€0.02, Opus the Unkillable

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