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Inlet manifold

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variable length. Straight high-speed runners can receive plugs, which contain small long runner extensions. The plenum of a 6- or 8-cylinder engine can be parted into halves, with the even firing cylinders in one half and the odd firing cylinders in the other part. Both sub-plenums and the air intake are connected to an Y (sort of main plenum). The air oscillates between both sub-plenums, with a large pressure oscillation there, but a constant pressure at the main plenum. Each runner from a sub plenum to the main plenum can be changed in length. For V engines this can be implemented by parting a single large plenum at high engine speed by means of sliding valves into it when speed is reduced.
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exhaust manifold design, as well as the exhaust valve opening time can be so calibrated as to achieve greater evacuation of the cylinder. The exhaust manifolds achieve a vacuum in the cylinder just before the piston reaches top dead center. The opening inlet valve can then—at typical compression ratios—fill 10% of the cylinder before beginning downward travel. Instead of achieving higher pressure in the cylinder, the inlet valve can stay open after the piston reaches bottom dead center while the air still flows in.
513: 478:, originally designed for carburetor V8 engines, the two plane, the split plenum intake manifold separates the intake pulses which the manifold experiences by 180 degrees in the firing order. This minimizes interference of one cylinder's pressure waves with those of another, giving better torque from smooth mid-range flow. Such manifolds may have been originally designed for either two- or four-barrel carburetors, but now are used with both throttle-body and 410: 343: 36: 443:
air in the manifold. Due to the air's inertia, the equalization will tend to oscillate: At first the air in the runner will be at a lower pressure than the manifold. The air in the manifold then tries to equalize back into the runner, and the oscillation repeats. This process occurs at the speed of sound, and in most manifolds travels up and down the runner many times before the valve opens again.
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static and dependent on the length of the intake runner and the speed of sound. The traditional solution has been to tune the length of the intake runner for a specific engine speed where maximum performance is desired. However, modern technology has given rise to a number of solutions involving electronically controlled valve timing (for example
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to be reduced. In an engine with at least six cylinders the averaged intake flow is nearly constant and the plenum volume can be smaller. To avoid standing waves within the plenum it is made as compact as possible. The intake runners each use a smaller part of the plenum surface than the inlet, which
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In some engines the intake runners are straight for minimal resistance. In most engines, however, the runners have curves, some very convoluted to achieve desired runner length. These turns allow for a more compact manifold, with denser packaging of the whole engine, as a result. Also, these "snaked"
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To harness the full power of the Helmholtz resonance effect, the opening of the intake valve must be timed correctly, otherwise the pulse could have a negative effect. This poses a very difficult problem for engines, since valve timing is dynamic and based on engine speed, whereas the pulse timing is
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spray fuel droplets into the air in the manifold. Due to electrostatic forces and condensation from the boundary layer, some of the fuel will form into pools along the walls of the manifold, and due to surface tension of the fuel, small droplets may combine into larger droplets in the airstream. Both
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distribute the combustion mixture (or just air in a direct injection engine) to each intake port in the cylinder head(s). Even distribution is important to optimize the efficiency and performance of the engine. It may also serve as a mount for the carburetor, throttle body, fuel injectors and other
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due to Helmholtz resonance. However, this effect occurs only over a narrow engine speed range which is directly influenced by intake length. A variable intake can create two or more pressurized "hot spots." When the intake air speed is higher, the dynamic pressure pushing the air (and/or mixture)
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As a result of "resonance tuning", some naturally aspirated intake systems operate at a volumetric efficiency above 100%: the air pressure in the combustion chamber before the compression stroke is greater than the atmospheric pressure. In combination with this intake manifold design feature, the
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property of air. Air flows at considerable speed through the open valve. When the valve closes, the air that has not yet entered the valve still has a lot of momentum and compresses against the valve, creating a pocket of high pressure. This high-pressure air begins to equalize with lower-pressure
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manifold technology. Four common implementations exist. First, two discrete intake runners with different length are employed, and a butterfly valve can close the short path. Second the intake runners can be bent around a common plenum, and a sliding valve separates them from the plenum with a
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manifolds with 'wet runners' for carbureted engines used exhaust gas diversion through the intake manifold to provide vaporizing heat. The amount of exhaust gas flow diversion was controlled by a heat riser valve in the exhaust manifold, and employed a
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of an engine. Abrupt contour changes provoke pressure drops, resulting in less air (and/or fuel) entering the combustion chamber; high-performance manifolds have smooth contours and gradual transitions between adjacent segments.
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engine (top) to a custom-built one used in competition (bottom). In the custom-built manifold, the runners to the intake ports on the cylinder head are much wider and more gently tapered. This difference improves the
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supplies air to the plenum, for aerodynamic reasons. Each runner is placed to have nearly the same distance to the main inlet. Runners whose cylinders fire close after each other, are not placed as neighbors.
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inside the engine is increased. The dynamic pressure is proportional to the square of the inlet air speed, so by making the passage narrower or longer the speed/dynamic pressure is increased.
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Only a certain degree of turbulence is useful in the intake. Once the fuel is sufficiently atomized, additional turbulence causes unneeded pressure drops and a drop in engine performance.
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The smaller the cross-sectional area of the runner, the higher the pressure changes on resonance for a given airflow. This aspect of Helmholtz resonance reproduces one result of the
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by enlarging the flame front. To achieve this turbulence it is a common practice to leave the surfaces of the intake and intake ports in the cylinder head rough and unpolished.
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sport either the Intake Manifold Runner Control (IMRC) for 4V engines, or the Charge Motion Control Valve (CMCV) for 3V engines.
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engine in the Ford Escort and Mercury Tracer feature an Intake Manifold Runner Control variable geometry intake manifold.
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which changed tension according to the heat in the manifold. Today's fuel-injected engines do not require such devices.
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Many automobile manufacturers use similar technology with different names. Another common term for this technology is
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or cast iron, but use of composite plastic materials is gaining popularity (e.g. most Chrysler 4-cylinders,
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which converts to a single plane manifold around 3500 rpm for greater peak flow and horsepower.
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runners are needed for some variable length/ split runner designs, and allow the size of the
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A cutaway view of the intake of the original Fordson tractor (including the intake manifold,
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As the name implies, VLIM can vary the length of the intake tract in order to optimize
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from multiple cylinders into a smaller number of pipes – often down to one pipe.
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vehicles. Longer inlet ducts used between 1500 and 4100 rpm at 80% load or higher.
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This vacuum can also be used to draw any piston blow-by gases from the engine's
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so the shorter path can be excluded by deactivating the intake valve itself.
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manifold, (adv.) "in the proportion of many to one, by many times". AD1526
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intake path can have a light pressurizing effect similar to a low-pressure
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The design and orientation of the intake manifold is a major factor in the
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engines. An updated version of this technology is employed on the new
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and the restriction caused by the throttle valve, in a reciprocating
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actions are undesirable because they create inconsistencies in the
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1992–1997 EG33 3.3-liter naturally aspirated DOHC 24-valve flat-6
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allows for a more complete burn of all the fuel and helps reduce
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The intake manifold has historically been manufactured from
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There are two main effects of variable intake geometry:
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EJ20 2.0-liter naturally aspirated DOHC 16-valve flat-4
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EJ20 2.0-liter naturally aspirated DOHC 16-valve flat-4
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Comparison of a stock intake manifold for a Volkswagen
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straight-4 engines; a similar technology is used in
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2.5- and 3.0-liter V6s and it was also found on the
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This 1740: 1188: 1044:) used in the early versions of the 842:, which is also used by Ford as the 369:adding citations to reliable sources 336: 224:Due to the downward movement of the 58:adding citations to reliable sources 29: 1062:(acoustic control induction system) 595:variable resonance induction system 293:2.0, Duratec 2.0 and 2.3, and GM's 24: 482:. An example of the latter is the 271:, ventilation system valves, etc. 136:Carburetors used as intake runners 25: 2432: 1177:Volvoclub UK: 850GLT Engine Info 1042:Toyota Variable Induction System 816:variable inertia charging system 663:Variable-resonance Intake System 422:of the engine's fuel/air intake. 341: 190:comes from the Old English word 34: 1927:Overhead valve (pushrod) layout 1091:Volvo B5254S and B5204S engines 1087:Volvo variable induction system 526:variable-length intake manifold 508:Variable-length intake manifold 502:Variable-length intake manifold 45:needs additional citations for 1157: 1132: 1120:Fusible core injection molding 912:: 2.2 L I4, 3.0 L V6 278:. This is known as a positive 13: 1: 1125: 300: 548:, as well as provide better 280:crankcase ventilation system 255:, emission control devices, 7: 1103: 476:180-degree intake manifolds 10: 2437: 1768:Internal combustion engine 534:internal combustion engine 505: 480:multi-point fuel injection 402: 249:automobile ancillary power 221:components of the engine. 170:internal combustion engine 2385: 2349: 2309: 2264: 2236:Diesel particulate filter 2221: 2188:Idle air control actuator 2170: 2137: 2129:Engine control unit (ECU) 2119: 2066: 2020: 1982: 1902: 1787: 1774: 1689: 1636: 1544: 1496: 1428: 1419: 1381: 1226: 1165:Oxford English Dictionary 2301:Viscous fan (fan clutch) 2213:Throttle position sensor 1922:Overhead camshaft layout 1840:Core plug (freeze plug) 874:is used on the 2.0L I4 699:Ford Modular V8 engines 1348:Single-acting cylinder 1281:Double-acting cylinder 667:Ford Cologne V6 engine 521: 423: 194:(from the Anglo-Saxon 153: 137: 1216:Engine configurations 1110:Cylinder head porting 894:– modern versions of 515: 428:volumetric efficiency 420:volumetric efficiency 412: 405:Cylinder head porting 333:Volumetric efficiency 143: 135: 27:Automotive technology 2081:Compression ignition 1318:Oscillating cylinder 820:Mazda FE-DOHC engine 732:: DOHC versions of 365:improve this section 241:atmospheric pressure 168:) is the part of an 54:improve this article 2231:Catalytic converter 1411:Two-and four-stroke 1313:Intake over exhaust 669:in the later model 440:Helmholtz resonance 2357:Knocking / pinging 1949:Combustion chamber 1115:List of auto parts 946:Campro CPS and VIM 522: 496:bi-metallic spring 424: 172:that supplies the 154: 138: 2416:Engine technology 2403: 2402: 2372:Stratified charge 2139:Electrical system 2121:Engine management 1954:Compression ratio 1894:Starter ring gear 1793:rotating assembly 1734: 1733: 1730: 1729: 1430:Inline / straight 1328:Overhead camshaft 1068:: 1.6 L I4, 904:3.2 L 54° V6 818:) is used on the 722:V6, and the 4.3L 681:dual-stage intake 568:dual overhead cam 401: 400: 393: 265:windshield wipers 152:, and fuel lines) 130: 129: 122: 104: 16:(Redirected from 2428: 2246:Exhaust manifold 2111:Spark plug wires 1997:Boost controller 1984:Forced induction 1761: 1754: 1747: 1738: 1737: 1426: 1425: 1421:Cylinder layouts 1209: 1202: 1195: 1186: 1185: 1179: 1174: 1168: 1161: 1155: 1154: 1152: 1151: 1136: 1093:as found on the 951:Proton Gen-2 CPS 864:160, 180 and 190 396: 389: 385: 382: 376: 345: 337: 207:exhaust manifold 205:In contrast, an 166:American English 125: 118: 114: 111: 105: 103: 69:"Inlet manifold" 62: 38: 30: 21: 2436: 2435: 2431: 2430: 2429: 2427: 2426: 2425: 2406: 2405: 2404: 2399: 2381: 2377:Top dead centre 2345: 2305: 2260: 2217: 2166: 2140: 2133: 2122: 2115: 2062: 2016: 1978: 1934:Tappet / lifter 1917:Flathead layout 1907: 1898: 1792: 1783: 1770: 1765: 1735: 1726: 1685: 1632: 1540: 1492: 1415: 1377: 1222: 1213: 1183: 1182: 1175: 1171: 1162: 1158: 1149: 1147: 1138: 1137: 1133: 1128: 1106: 1101: 1100: 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2008: 2005: 2003: 2000: 1998: 1995: 1993: 1992:Blowoff valve 1990: 1989: 1987: 1985: 1981: 1975: 1972: 1970: 1967: 1965: 1962: 1960: 1957: 1955: 1952: 1950: 1947: 1945: 1942: 1940: 1937: 1935: 1932: 1931: 1928: 1925: 1923: 1920: 1918: 1915: 1914: 1912: 1910: 1909:Cylinder head 1905: 1901: 1895: 1892: 1890: 1887: 1885: 1882: 1880: 1877: 1875: 1872: 1870: 1867: 1865: 1862: 1860: 1857: 1854: 1850: 1846: 1843: 1841: 1838: 1836: 1833: 1831: 1828: 1826: 1823: 1821: 1818: 1816: 1813: 1811: 1808: 1806: 1803: 1801: 1800:Balance shaft 1798: 1797: 1795: 1790: 1786: 1782: 1780: 1773: 1769: 1762: 1757: 1755: 1750: 1748: 1743: 1742: 1739: 1723: 1720: 1718: 1715: 1713: 1710: 1708: 1705: 1703: 1700: 1698: 1695: 1694: 1692: 1688: 1682: 1679: 1677: 1674: 1672: 1669: 1667: 1664: 1662: 1659: 1657: 1654: 1652: 1649: 1647: 1644: 1643: 1641: 1639: 1635: 1629: 1626: 1624: 1621: 1619: 1616: 1614: 1611: 1609: 1606: 1604: 1601: 1599: 1596: 1594: 1591: 1587: 1584: 1583: 1582: 1579: 1575: 1572: 1571: 1570: 1567: 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Index

Intake manifold

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vaporizer
carburetor
American English
internal combustion engine
fuel
air
cylinders
manifold
exhaust manifold
exhaust gases
pistons
spark ignition
piston engine
vacuum
atmospheric pressure
manifold vacuum

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