Get up and running again this weekend, a nicely cut and pressed alloy tank for a ROTRAX Kit Car is calling.
Area above that we have free to fill with an aluminium fabricated fuel tank, size, shape, capacity, design, filler, pick up and breather position to consider as well as stages of manufacture. This is gonna be a wide, flat tank to sit up inside the chassis and care to add a sump in a position to miss the diff at max suspension compression is required.
Keep an eye on our blog for pictures of build.
See videos of the build –
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The biggest benefit of using fuel tank foam is to reduce fuel “sloshing” in the tank. Tank foam is special open cell foam that cushions the fuel sloshing around in the tank and reduces fuel moving about. This “sloshing” can cause a change in the centre of gravity of the car or vehicle, motorcycles can be affected far more by fuel sloshing, due to sheer weight of fuel moving around (approx 1 ltr = 1kg). Adding foam also reduces the chance of injected engines being starved of fuel during long corners as the fuel tries to slosh to one side. The foam only takes up approx 3-4% volume of the tank, so tank capacity is not drasticall affected. Tank foam can be purchased in 1 cut piece to fit into a new tank or alternatively small blocks that can be squashed and pushed in through the filler neck or sender aperture (if available). A point to consider is that tank foam is not always sufficient to use in fuel tanks for drift cars as forces and speed involved in changing direction so quickly can still cause fuel starvation if the fuel moves around the tank too much. In this case hinged or pivoting baffles are needed instead of tank foam. These work by closing off an area of the tank and keeping fuel in a position where the fuel pick up can do just that – pick it up to feed the fuel pump. When the car direction changes the hinged baffle opens to allow fuel to flow back into the chamber. Alternative methods are utilising a fuel swirl pot as an integral part of the tank or between the low and high pressure pumps to maintain constant feed to the injectors. This is not a requirement or so much of a problem on vehicles that run on carbs as they have a dash pot in which fuel is kept at a constant level by the float and shut off valve.
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