Decarbonizing without Dismantling
Page 43
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APREPARATION called Carborid has been introduced by Blue Star Industrial Products, Ltd., 137, Victoria Street, 'London, SAVA., which is claimed quickly to remove carbon deposit, etc., from the combustion chamber, sparking-plugs, valves and piston rings of an internal-combustion engine. This can be done by introducing a small quantity of the fluid into each cylinder, through the sparking-plug hole, turning the crankshaft to distribute it, and then running the engine for afew minutes, when, it is claimed, the carbon is discharged in the form of dust. Carborid is obtain
able in tins of various sizes from 3s. 6d. and the estimated cost of a monthly treatment is about 1s. each time.
The preparation has been tested by a member of the staff of this paper on a private car, in two cylinders of which compfession was inferior to that of the other fella presumably through partially gummed-up piston rings, and which was known badly to need decarbonizing. Carborid was introduced first into only the two weak cylinders. No appreciable discharge of carbon was detected, but the compression was, at least in part, restored, and subsequently a marked improvement in the performance of the vehicle was noted.
Later the other cylinders were treated. This time a quantity of fine carbon was deposited on a white cloth held behind the exhaust pipe, and a further improvement was observed in the car's running, particularly in re
spect of hill-climbing. Applied to a thickly carboned piston, Carborid was found to soften the deposit, enabling it to be scraped off more readily than would otherwise have been possible.
The preparation appears to do what is claimed for it, but an important item of a "top overhaul" is valve grinding, Which, of course, is apt to be neglected when chemical decarbonizing methods without dismantling are adopted.