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Q A precombustion type of diesel engine with indirect injection is
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less efficient than one with direct injection because of the pumping losses which result from the traneer of gases from the cylinder to the chamber on the compression stroke and from the chamber to the cylinder on the firing stroke.
But I have heard it said that indirect injection may come into its own as a means of reducing pollution or of greater interest in my case, of increasing the rpm and power of the engine. Are either or both of these claims justified?
A Because the spherical shape of a typical precombustion chamber is the most 2ompact obtainable and because precise aontrol of air swirl is facilitated by indirect Lnjection, it is possible to improve combustion of the charge, notably of the boundary Layers of gas. And while this does not aompensate for the higher pumping losses Ln terms of fuel consumption it reduces the emission of diesel smoke and carbon monoxide.
There seems to be some doubt whether Lt also reduces oxides of nitrogen, the production of which increases with flame temperature. Improved control of combustion also favours an increase in rpm and specific output given that the breathing capability of the engine is adequate, which in practice would normally depend on intake valve area. It is understood that a single cylinder turbocharged research engine of the precombustion type has been operated up to 6000 rpm.