Turbob lowing Reduces Exhaust Temperatures
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TESTS of a Daimler CD.6 engine, first. normally aspirated and then turbocharged, at the B.S.A. Research Centre, have shown that • the blower reduces the exhaust temperatures substantially over most of the operating
range. , For example, when running at a speed of 1,800 r.p.m. and a b.m.e.p. of 110 p.s.i., the temperature is reduced from 625° C. to 476° C. At 1,000 r.p.m. and a similar b.m.e.p. reading the temperature of the turbocharged engine is 426° C., which is nearly 50° C. lower than that of the normally aspirated version.
The gain in b.m.c.p. afforded by turbocharging for a given temperature is indicated by comparing the p.sl. figures at a temperature of approximately 450° C. when the engine is running at 1,800 r.p.m. Whereas the normally aspirated unit operates at this temperature when the b.m.e.p. is around 80 p.s.i., the pressure of the blown engine can be increased to 100 p.s.i. before it is exceeded.
These tests indicate the possibilities of turbocharging as a means for improving the reliability as well as the efficiency of an engine.
OWNER-DRIVER ON TWO CHARGES
AN owner-driver, who carried on business as a limited liability company, appeared at Rochester magistrates' court last week, charged both with failing to keep proper records and causing them improperly to be kept. He was Donald Thorn, of Frindsbury, Kent. The magistrates fined him 10s. with 2s. 6d. costs for failing to keep records, but gave him an absolute discharge, on payment of 4s. costs, on the second count. More than 50 drivers were in court, but some other o,wner-drivers, who traded not as limited liability companies, were charged only with failing to keep records.
The cases arose out of a road check by Ministry of Transport inspectors at Strood on June 18.
CAR ALLOWANCES IN DISPUTE
TODAY the National Arbitration Tribunal of Northern Ireland are to hear the dispute that has arisen between members of Ulster Public Officers' Association and the Ulster Association of County Councils regarding car travelling and subsistence allowances.
The dispute was first reported to the Ministry of Labour on March 11. and the test case that is being heard by the Tribunal concerns the Armagh County Council.
Included in the statement submitted by the Officers' Association to the Tribunal is a copy of the article and cost tables on staff car operation which appeared in The Commercial Motor on August 30.
BORG-WARNER FREE-WHEEL CLUTCH
I-1 A NEW one-way clutch will he exhibited by Borg-Warner, Ltd., at the London Motor Show next month. Among its many applications it is suitable for use with automatic gearboxes, torque converters and front-axle drives.
It consists of a number of small cams, held in two circular cages by a ribbon spring. The unit, which is compact, transmits drive in one direction only, and phasing of the cams ensures a smooth power take-up. Several sizes are to be manufactured.
NEW THREE-CYLINDERED B.M.C. ENGINE
A THREE-CYLINDERED version ri of the B.M.C. 3.4-litre fourcylindered oil engine is employed in the new Nuffield Universal Three mediumduty farm tractor, which was announced this week.
Many internal parts of this unit are interchangeable with those of the fourcylindered engine. As installed in the tractor it develops 29.3 b.h.p. at 1,400 r.p.m. and 37 b.h.p. at 2,000 r.m.p. The engine, which has direct injection, has a cubic capacity of 2.55 litres (155.6 cu. in.).