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  2. Four-stroke engine - Wikipedia

    en.wikipedia.org/wiki/Four-stroke_engine

    Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.

  3. Dry sump - Wikipedia

    en.wikipedia.org/wiki/Dry_sump

    A dry-sump system is a method to manage the lubricating motor oil in four-stroke and large two-stroke piston driven internal combustion engines. The dry-sump system uses two or more oil pumps and a separate oil reservoir, as opposed to a conventional wet-sump system, which uses only the main sump (U.S.: oil pan) below the engine and a single pump.

  4. Ford Sigma engine - Wikipedia

    en.wikipedia.org/wiki/Ford_Sigma_engine

    In 2002 a supercharged 1.0-litre 95 PS (70 kW; 94 hp) version was released for the Ford Fiesta, to compete with the 1.0 Turbo 16v 112 PS (82 kW; 110 hp) version of the Volkswagen Gol. In 2001 the Zetec RoCam engine was introduced in Europe, but labeled as Duratec 8v , for the Ka and Fiesta.

  5. Topsoil - Wikipedia

    en.wikipedia.org/wiki/Topsoil

    Topsoil is composed of mineral particles and organic matter and usually extends to a depth of 5-10 inches (13–25 cm). Together these make a substrate capable of holding water and air which encourages biological activity.

  6. Soil regeneration - Wikipedia

    en.wikipedia.org/wiki/Soil_regeneration

    Soil. Soil regeneration, as a particular form of ecological regeneration within the field of restoration ecology, is creating new soil and rejuvenating soil health by: minimizing the loss of topsoil, retaining more carbon than is depleted, boosting biodiversity, and maintaining proper water and nutrient cycling. [1]

  7. Hydrophobic soil - Wikipedia

    en.wikipedia.org/wiki/Hydrophobic_soil

    A hydrophobic barley field increased crop yield from 1.7 to 3.4 t/ha, and a field of lupins increased the yield by 1 t/ha within 2 years of claying. [3] Liming is a method to reduce soil water repellency in acidic soils. [3] The liming process consists of adding calcium carbonate, which increases the pH of the soil towards neutral.

  8. Soil in the United States - Wikipedia

    en.wikipedia.org/wiki/Soil_in_the_United_States

    Soils are the product of climate, organisms and topography, acting on parent (geologic) material over time. Thus the great diversity of geologic materials, geomorphic processes, climatic conditions, biotic assemblages and land surface ages in the United States is responsible for the presence of an enormous variety of mineral and organic soils.

  9. Soil loss tolerance - Wikipedia

    en.wikipedia.org/wiki/Soil_loss_tolerance

    Soil loss tolerance for a specific soil, also known as the T value, which can be calculated with = + [1] formula, is the maximum average annual soil loss expressed as tons per acre per year that will permit current production levels to be maintained economically and indefinitely.