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FILTER TESTS with the aid of a DUST TUNNEL

FILTER TESTS with the aid of a DUST TUNNEL considerably. In one test, wear was reduced in this wa y by one tenth. Tests with the oil bath type of FILTER air cleaner were run for twenty-five hours as against only five hours with the oil wetted one, and wear was still only half as much. A n oil bat h air cleaner used in conjunction with a TEST S good type of lubricating oil filter showed still further improvement , and more than halved crankshaft bearing wear. with the aid of a Importanc e of Crankcase Ventilation. A test was also made to ascertain the value of DUS T clean ventilating air in the crankcase. Instead of using a metal mesh air cleaner to clean th e ventilating ai r through the crankcase, the ventilating air was TUNNE L draw n from the control room after passing through a n absolute filter. Definite improvements in de­ crease in bearing weights and in increase in bearing SOME results were recently given of tests made on clearances were recorded, bearing wear being reduced a motor car running inside a dust tunnel, in b y one half to one third, compared with a similar order to evaluate various sources of engine damaging tes t run with the metal mesh crankcase air cleaner. dirt and to assess th e effects of various type s of filters. Oil filters were not used for this test. Th e facts were given by W. S. James and B. Gratz Brown , both of the Fram Corporation, U.S.A. in a Valu e of Chrome Plated Rings pape r presented recently to the Society of Automotive Engineers . Th e dust tunnel was also used to assess the value of chrome plated rings under dusty conditions. It was found that the use of chrome-plated top rings Dus t Tunnel Details. doubles th e time that the engine could be ru n before Th e Fra m dust tunnel is a room 50 ft. long by 15 ft. excessive blow-by occurred. These rings also reduced wide, by 13 ft. high. A 200,000 cu. ft ./min.blowe r bore wear by 75 pe r cent. There was little indication is mounted slightly below floor level in one end of of reduced wear on other than the top rings when th e room. It is drive n by V-belts from drums located the y were chromium plated. Tests were also made transversel y across th e room, the drums being driven wit h two thicknesses of chrome plating, 0.002-0.004 b y the rear wheels of the car. in. and 0.004-0.06 in. The thicker plated rings Th e blast passes under the floor through a duct certainl y had the longer life, but not in proportion an d is guided back towards the car. Dust is fed t o the increased thickness. It was also recorded int o the blower inlet, and the air blast directed at tha t th e use of chrome-plated rings in th e to p grooves, th e front of the car. Dust concentration in the tests tende d to reduce the side clearance between the ring was 0,125 gm/cu. ft. of air. The engine was remotely and groove for the second ring. controlled and ran at a speed equal to 00 m.p.h. for continuou s runs of about 2 hr., i.e. until the fuel was almost exhausted. Repeatabilit y of Results. Th e results reporte d in twelve test s showed evidence of repeatability as regards the degree of engine and pisto n ring wear and the condition of the lubricating oil after test. As to what relation there is between th e severe conditions used in dust tunnel tests and service conditions, the authors stated that they did no t know but were planning to find out. They are also t o mak e further tests using lighter concentrations of dust. In any case, the y were of th e opinion that th e dust tunnel can provide valuable assistance toward s the manufacture of improved filters, and certainly be used for many other purposes, e.g. to assess the effects of certain types of dust and their effects, in turn, on differing engine materials. Oi l Wette d Type Air Cleaners. Th e results showed that some types of oil wetted carburetto r air cleaners gave little protection against air born dust, but that an oil bath carburettor air cleaner certainly reduced ring and bore wear very Scientific LUBRICATION January, 1951 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Industrial Lubrication and Tribology Emerald Publishing

FILTER TESTS with the aid of a DUST TUNNEL

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0036-8792
DOI
10.1108/eb053440
Publisher site
See Article on Publisher Site

Abstract

considerably. In one test, wear was reduced in this wa y by one tenth. Tests with the oil bath type of FILTER air cleaner were run for twenty-five hours as against only five hours with the oil wetted one, and wear was still only half as much. A n oil bat h air cleaner used in conjunction with a TEST S good type of lubricating oil filter showed still further improvement , and more than halved crankshaft bearing wear. with the aid of a Importanc e of Crankcase Ventilation. A test was also made to ascertain the value of DUS T clean ventilating air in the crankcase. Instead of using a metal mesh air cleaner to clean th e ventilating ai r through the crankcase, the ventilating air was TUNNE L draw n from the control room after passing through a n absolute filter. Definite improvements in de­ crease in bearing weights and in increase in bearing SOME results were recently given of tests made on clearances were recorded, bearing wear being reduced a motor car running inside a dust tunnel, in b y one half to one third, compared with a similar order to evaluate various sources of engine damaging tes t run with the metal mesh crankcase air cleaner. dirt and to assess th e effects of various type s of filters. Oil filters were not used for this test. Th e facts were given by W. S. James and B. Gratz Brown , both of the Fram Corporation, U.S.A. in a Valu e of Chrome Plated Rings pape r presented recently to the Society of Automotive Engineers . Th e dust tunnel was also used to assess the value of chrome plated rings under dusty conditions. It was found that the use of chrome-plated top rings Dus t Tunnel Details. doubles th e time that the engine could be ru n before Th e Fra m dust tunnel is a room 50 ft. long by 15 ft. excessive blow-by occurred. These rings also reduced wide, by 13 ft. high. A 200,000 cu. ft ./min.blowe r bore wear by 75 pe r cent. There was little indication is mounted slightly below floor level in one end of of reduced wear on other than the top rings when th e room. It is drive n by V-belts from drums located the y were chromium plated. Tests were also made transversel y across th e room, the drums being driven wit h two thicknesses of chrome plating, 0.002-0.004 b y the rear wheels of the car. in. and 0.004-0.06 in. The thicker plated rings Th e blast passes under the floor through a duct certainl y had the longer life, but not in proportion an d is guided back towards the car. Dust is fed t o the increased thickness. It was also recorded int o the blower inlet, and the air blast directed at tha t th e use of chrome-plated rings in th e to p grooves, th e front of the car. Dust concentration in the tests tende d to reduce the side clearance between the ring was 0,125 gm/cu. ft. of air. The engine was remotely and groove for the second ring. controlled and ran at a speed equal to 00 m.p.h. for continuou s runs of about 2 hr., i.e. until the fuel was almost exhausted. Repeatabilit y of Results. Th e results reporte d in twelve test s showed evidence of repeatability as regards the degree of engine and pisto n ring wear and the condition of the lubricating oil after test. As to what relation there is between th e severe conditions used in dust tunnel tests and service conditions, the authors stated that they did no t know but were planning to find out. They are also t o mak e further tests using lighter concentrations of dust. In any case, the y were of th e opinion that th e dust tunnel can provide valuable assistance toward s the manufacture of improved filters, and certainly be used for many other purposes, e.g. to assess the effects of certain types of dust and their effects, in turn, on differing engine materials. Oi l Wette d Type Air Cleaners. Th e results showed that some types of oil wetted carburetto r air cleaners gave little protection against air born dust, but that an oil bath carburettor air cleaner certainly reduced ring and bore wear very Scientific LUBRICATION January, 1951

Journal

Industrial Lubrication and TribologyEmerald Publishing

Published: Jan 1, 1951

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