Comments by "José Veinte Genario -NISU" (@joseveintegenario-nisu1928) on "A Sleeve Valve Almost Took Over A Poppet Valve Unit" video.

  1. How thick were the Bristol Sleeves in their SSV engines? Some are left from the license-produced units by SNECMA, installed in 'Noratlas', now working for 'Tractor Pulling' contests. What about the Piccard-Pictet design, pat GB118407? Blessings +
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  2. Wear of valves in early poppet valve engines was caused by the poor quality of available fuels; until the work by Harry Ricardo, cause of detonation was unknown, the low compression ratio in early engines had a high exhaust gas temperature, burning valves. Sleeve Valves allowed for higher CR with same gasoline, no hot spots in combustion chamber. Nothing compares to Bristol SSV engines, pls see interview with Mike Hewland, Car&Driver, july 1974.
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