Can heating save fuel?
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BY HEATING the fuel and thereby reducing its density, Brian Dixon, of Air Products, of Bracknell, Berkshire, in Tim Blakemore's feature on fuel economy (CMJanuary 8) is effectively reducing the mass of fuel that his volumetric fuel injection system feeds to the engine with, needless to say, a resultant drop in engine power output.
The same result can be obtained with less magic by adjustment of the fuel injection system.
MARK WAG HORN Leslie Hartridge Ltd Buckingham PS: Is the spiral in the coiled fuel line clockwise or anticlockwise?
Tim Blakemore replies: We said it was "improbable" but Brian Dixon does seem to be convinced of its worth.
We think the spiral is clockwise in the northern hemisphere and anti-clockwise in the southern.