The phrase "at different engine speeds" is correct and usable in written English.
It can be used when discussing the performance or behavior of an engine under varying rotational speeds.
Example: "The fuel efficiency of the vehicle changes at different engine speeds, affecting overall performance."
Alternatives: "at varying engine RPMs" or "at multiple engine speeds".
Variable valve timing can optimize performance and economy and provide a more constant engine torque output at different engine speeds.
The trick for designers is to minimize the natural vibrations occurring at different engine speeds by achieving balance, as much as possible, among the rotating and reciprocating parts.
The corrected BSFC behavior at different engine speeds is shown in Fig. 3.
These tests are done at different engine speeds and full-load condition with different CNG mass fractions.
In order to compare the engine performance in gasoline and CNG modes, full-load tests at different engine speeds are done.
Based on an experimental dataset, metamodels were generated using different radial basis functions and kriging techniques in order to accurately predict torque, fuel consumption, specific fuel consumption, global efficiency and CO2 emission with twelve blends of iso-octane, n-heptane, toluene and ethanol at different engine speeds and load conditions.
The system performance was evaluated for 65 °C flow temperature from condenser at three different engine speeds (1600, 2000 and 2400 rpm) and four evaporator water inlet temperatures (0, 5, 10 and 15 °C).
The performance was evaluated against four-evaporator water inlet temperature (0, 5, 10 & 15 °C) and at three different engine speed 1600, 2000 & 2400 rpm.
The main purpose of this study is to evaluate the heat losses at different engine loads and speeds with and without ceramic-coated diesel engine.
The main aim of this study is to evaluate the effects of ceramic coating on diesel engines' effective efficiency at different engine loads and speeds.
Particulate emissions at the exhaust of a diesel engine were systematically investigated at different engine loads and speeds by rapid thermophoretic sampling followed by direct transmission electron microscope (TEM) visualization.
