B.M.E. Vaporizer Available for Thornycrofts IfJAVING proved successful in _forms
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suitable for Leyland and Ford engines, the apparatus made by the 13urtonweed Motor Engineering Co., Ltd., Collins Green, Warrington, for converting existing power units to run on vaporizing oil is now produced for use on MB4-type Thornycroft en gines. The claim made by Mr. A. Roger, chief designer for the concern, who is responsible for the development of the B.M.E. vaporizers, is that the latest type gives an increase of 32i per cent. in the miles per gallon of fuel consumed.
As on previous designs, both the induction pipe and manifold are jacketed. The hot gases from the exhaust are passed, first through the jacketsurrounding the vertical pipe from the carburetter, and are then conveyed to the forward end of the jacket surrounding the manifold itself, from the rear end of which they are led back to the exhaust pipe.
Considerable importance is placed by Mr. Roger on the design of the chamber at which the gases leave and return
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to the main exhaust pipe. The discharge port is situated just above a point where the diameter of the hore isrestricted, and gases return to the annular space siarrounding the restricted. portion, which, in effect, is a choketube. This space is in communication
with the main -pipe,. consequently, by reason of the cooling of the gases while circulating -through the iridue.tionsYStein jackets, a depression is created below the exhaust choke, • which -,is claimed actually to improve the thermal efficiency of the engine.