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Aviation History
1944
1944 - 1402.PDF
\Flight,July 13th, 1944. Advt. THE SLEEVE VALVE EXPLAINED No. 6 «#[**| 00^ REDUCING FIRE RISK In spite of the fact that higher compression ratios can be used, cylinder and exhaust temperatures on " Bristol " sleeve valve engines are low compared with other engines. The absence of complicated cylinder head mechanism and the motion of the sleeve valves are directly respon sible for this advantage. In the first place, the characteristic oscillating motion of the sleeve as it moves up and down the cylinder bore dissipates cylinder heat over a larger area, whilst the simple cylinder head with a perfectly symmetrical combustion chamber eliminates areas of metal which would normally become overheated. Furthermore, cool oil from the crankshaft oil jets is directed to the under surface of the piston, thereby dissipating much of the heat from the piston crown. Cylinder and exhaust temperatures are therefore reduced and the risk of fire is greatly minimised. Couple these advantages to the fact that, with the exception of the combustion chamber, all surfaces of the cylinder and sleeve are fully and continuously lubricated, thus minimising wear and ensuring freedom from hot-lead corrosion, and you will understand the advantages of SLEEVE VALVE AERO ENGINES
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