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Technical Notes Prepared for the United States Army School of Military Aeronautics, University of Illinois, by the Technical Staff

Technical Notes Prepared for the United States Army School of Military Aeronautics, University of Illinois, by the Technical Staff


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...and adjustments. It is equally important that for best volumetric efficiency the intake valve should close when the pressure within the cylinder reaches atmospheric on the compression stroke. Until that time, gas will continue to flow in because of the difference of pressure; but if the valve remained open any longer there would be expulsion of combustible gas and reduced compression. The point of exhaust-valve opening has no effect on volumetric efficiency, and is considered under Class 2. (See diagram, Fig. 316.) b Fig. 316.--Typical Valve-Timing Diagram d. Improper valve clearance, if too much, decreases the valve lift and shortens the period of valve opening. In addition to increasing the resistance to flow, the valve timing is affected, which in turn affects the volumetric efficiency as explained in the preceding paragraph. Too little valve clearance results in early valve opening and late closing. The clearance should be on the order of a few thousandths of an inch, ENGINES and account must always be taken of the fact that expansion of the engine in heating up affects the clearance adjustment. The purpose of clearance is to permit free expansion and contraction between the cylinder and valve-actuating mechanism. e. Worm cams result in improper valve action, giving very much the same effect as too much valve clearance. The only remedy is a new camshaft. /. Weak valve springs will not close the valves quickly, and at high speeds this is a source of considerable loss in power. Stiff springs, on the other hand, increase the resistance to opening and reduce the mechanical efficiency of the engine. Pour-valve construction makes lighter valves and lighter springs possible, besides offering larger openings. The spring on an automatic suction valve, as used wi...


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Product Details
  • ISBN-13: 9781130127027
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 68
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1130127028
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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Technical Notes Prepared for the United States Army School of Military Aeronautics, University of Illinois, by the Technical Staff
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