Clerget 100 hp heavy-oil engine Page: 4 of 14
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N.A.C.A. Technical Memorandum No. 603
vertical plane passing through the engine axis at the lowest
point of the bottom cylinders. Complete evacuation of residual
oil during operation and at rest is thus facilitated.
Pistons (Fig. 6).- Of ordinary light alloy; piston pin
free both in its bosses and in the small end of the connecting
rod; four piston rings and one scraper ring. -A considerable
number of patents have been taken out during the last few years
for special shapes of intake domes, combusti'on or precombustion
chambers, cut-out sections, piston deflectors, etc. The purpose
of these shapes is to produce the degree of turbulence required
for the combustion in heavy-oil eng.ines. Most of them, however,
present disadvantages which balance the anticipated increase in
efficiency, perhaps' on account of their complexity.
Clerget thinks that turbulence can be produced by very
simple means, namely a hatural' intake, the shape of the piston
and the distribution' of -the fuel during combustion. The form
of his piston is hemispherical, and the sheet-type injection at
the center of this cavity insures good combustion 'in the vorti-
ces produced by the piston when it approaches the top of the
cylinder. Contact of the fuel with the cylinder walls being
avoided, the carbon deposits do not adhere and are ejected
during the exhaust. These arrangements have given excellent
results at high speeds.
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Leglise, Pierre. Clerget 100 hp heavy-oil engine, report, January 1, 1931; (digital.library.unt.edu/ark:/67531/metadc277380/m1/4/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.