chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
combine, compound - combine so as to form a whole; mix; "compound the ingredients"
In aspirated (carbureted) engines, this is not a problem, but with injected engines this will promote premature stretching of injectors, which supports poor engine performance all around.
As for the sound as you accelerate, it was like mechanical music, a carbureted gurgle that ascended into an angry buzz as the revs picked up, though the car was surprisingly quiet at moderate speeds, a characteristic that seemed to elude most affordable cars at the time, and even today.
Equipped with such cutting-edge niceties as a carbureted engine, clear vision ventilation, a redesigned chromium-plated grill, an improved spring design, and swivel type sun visors, the base model cost $535 new off the dealer's lot.
He initiated a retooling exercise, moving from carbureted cast-iron engines to all-alloy unit construction that allowed integration of multi-valve electronic fuel-injection systems.