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In internal combustion engines with carburetors, a choke valve or choke modifies the air pressure in the intake manifold, thereby altering the air–fuel ratio entering the engine. Choke valves are generally used in naturally aspirated engines to supply a richer fuel mixture when starting the engine.
A choke is designed to alter or shape the distribution of the shot as it leaves the firearm. For shooting most game birds and clay pigeons, a desirable pattern is one that is as large as possible while being dense enough to ensure multiple hits on the target, at a particular range. The choke should be tailored to the range and size of the targets.
Figure 1a shows the flow through the nozzle when it is completely subsonic (i.e. the nozzle is not choked). The flow in the chamber accelerates as it converges toward the throat, where it reaches its maximum (subsonic) speed at the throat. The flow then decelerates through the diverging section and exhausts into the ambient as a subsonic jet.
Flooding can also occur if the choke has been over applied or has malfunctioned. A severe form of engine flooding occurs when excessive liquid fuel enters the combustion chamber. This reduces the dead volume of the combustion chamber and thus places a heavy load on the starter motor, such that it fails to turn the engine. Damage (due to ...
Ported chamber: A barrel chamber with pressure relief ports that allows gas to leak around the cartridge during extraction. Basically the opposite of a fluted chamber as it is intended for the cartridge to stick to the chamber wall making a slight delay of extraction. This requires a welded-on sleeve with an annular groove to contain the pressure.
NEW YORK — The Rev. Al Sharpton, in a fiery Saturday address, demanded criminal charges against all involved in the choke-hold death of Jordan Neely aboard a Manhattan subway train. “If you do ...
Vent Rib, Rem Choke Extended full choke, TRUGLO rail system. Receiver milled for maximum strength and reliability. [13] Turkey Camo 12-gauge 21 in (530 mm) Vent Rib, Rem Choke Pump action with full Rem Choke. Matte black finish on barrel and receiver. Synthetic stock. Shoots both 2 3/4" and 3". [13] SPS Superslug 12-gauge 25 + 1 ⁄ 2 in (650 mm)
Two parents allegedly tried to choke their 17-year-old daughter outside her high school in an attempted “honor killing” for refusing an arranged marriage with an older man, according to police.