Parasitic loss

Parasitic loss

In short, Parasitic Loss is a loss that a parasite consumes from its host which may or may not be beneficial to the host.

Parasitic loss in internal combustion engines

The term Parasitic Loss is often applied to devices that consume energy from the engine to create more energy for the engine. In the internal combustion engine almost everything including the driveline causes parasitic loss. Bearings, oil pumps, piston rings, valve springs, flywheels, transmissions, driveshafts, differentials, etc., also rob the system of power. One would not consider running an engine without lubrication such as an oil pump so in this instance the pump is a necessary parasite that consumes at least some power from the engine (its host).

For instance, a supercharger derives its power from the engine to create more power from the engine. The power that the supercharger consumes is parasitic loss and is usually expressed in horsepower (hp). While the hp that the supercharger consumes in comparison to what it generates is small, the hp is still measurable or calculable.

One of the desirable features of a turbocharger over a supercharger is the lower parasitic loss of the former.

Another common use of the term is where a new or different design reduces parasitic loss. For instance, the use of a dry sump over a wet sump results in lower parasitic loss. The reason may be less friction or many other variables that cause the design to be more efficient.

Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Parasitic plant — A parasitic plant is one that derives some or all of its sustenance from another plant. About 4,100 species in approximately 19 families of flowering plants are known. [Nickrent, D. L. and Musselman, L. J. 2004. Introduction to Parasitic… …   Wikipedia

  • Selected infectious and parasitic diseases of animals — ▪ Table Selected infectious and parasitic diseases of animals animal(s) affected name(s) of disease nature of disease Diseases of bacterial origin most mammals, chickens necrobacillosis, calf diptheria, bovine foot rot, necrotic hepatitis,… …   Universalium

  • Weight loss — Classification and external resources ICD 9 783.21 For the episode of the American version of The Office, see Weight Loss (The Office). Weight loss, in the context of medicine, health or phys …   Wikipedia

  • Chevrolet Corvette C5 Z06 — This article is about the Chevrolet Corvette C5 Z06. For general Corvette Z06 information, see Chevrolet Corvette Z06. C5 Z06 Manufacturer C …   Wikipedia

  • Diesel engine — Diesel engines in a museum Diesel generator on an oil tanker …   Wikipedia

  • Saturn Ion — Infobox Automobile name = Saturn Ion manufacturer = General Motors production = 2003–2007 predecessor = Saturn S Series class = Compact successor = Saturn Astra body style = 4 door sedan 4 door quad coupe platform = GM Delta platform layout = FF… …   Wikipedia

  • DEXRON — A bottle of Dexron II fluid marketed under the AutoPar brand by Chrysler Canada, early 1980s Dexron is the trade name for a group of technical specifications of automatic transmission fluid created by General Motors (GM). The name is a registered …   Wikipedia

  • Kaman K-MAX — Infobox Aircraft name=K MAX caption= A HELOG Heliswiss Kaman K Max type=Medium lift helicopter manufacturer=Kaman Aircraft designer= first flight= introduced= retired= status=Active primary user= more users= produced= number built=38+ unit cost=… …   Wikipedia

  • Life Sciences — ▪ 2009 Introduction Zoology       In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …   Universalium

  • plant disease — ▪ plant pathology Introduction       an impairment of the normal state of a plant that interrupts or modifies its vital functions.       All species of plants, wild and cultivated alike, are subject to disease. Although each species is… …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”