For Use With Carburetor Upstream Of Manifold Patents (Class 123/184.46)
  • Publication number: 20150136058
    Abstract: An air intake housing and flow enhancing plate for a carburetor with a fluted and contoured air intake opening that flushly aligns with and matches the shape of the carburetor air intake opening. The low profile plate is made of metal for durability and heat resistance. The centrally located air intake opening of the plate has a clover leaf or undulating shape that conforms to the shape of the carburetor air intake opening. The plate is secured directly over the top of the carburetor, and extends radially outward to provide a larger area for securing its fiberglass housing. The housing holds a conventional ring shaped air filter located around the carburetor air intake opening. The plate provides smooth transitions between surfaces to decrease turbulence and improve air flow.
    Type: Application
    Filed: November 19, 2013
    Publication date: May 21, 2015
    Applicant: Five Star Fabricating, Inc.
    Inventors: Carl W. Schultz, Timothy G. Ormiston, Thomas E. Pecaro
  • Patent number: 8925521
    Abstract: An adjustable restrictor device for controlling flow of induction air into an engine. The restrictor device may comprise a generally flat compact housing which is installed between a carburetor and intake manifold of an engine. The housing may have throughbores to allow air flow, which coincide in location to carburetor bores. The restrictor device may have two individual restrictors enclosed therein, each movable to positions which progressively obstruct and open the throughbores to control flow of inducted air. Each restrictor may be manually controlled in common by a rotatable control shaft. Threading of the knobs may be opposite handed, thereby enabling the restrictors to move similarly in effect as to controlling air flow but in opposite directions.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: January 6, 2015
    Inventor: Rollin Kim Lee
  • Publication number: 20140165949
    Abstract: A carburetor attachment assembly for improved engine performance including an airflow crown and a mating air cleaner base. The air flow crown is adapted to detachably mount atop a carburetor and has a contoured intake surface that guides and directs airflow into the mouth of the carburetor. The airflow crown's intake surface is configured to merge with the sidewalls of the induction bores to form a smooth continuous surface around the mouth of the carburetor and induction bores, which helps facilitate laminar airflow and redirection of the intake air flow downward into the carburetor.
    Type: Application
    Filed: December 14, 2012
    Publication date: June 19, 2014
    Inventors: Edward J. Sroka, Edward J. Fox
  • Patent number: 8746191
    Abstract: A two-stroke engine has an intake arrangement including a carburetor. An intake channel divides into a mixture channel and an air channel. An intermediate flange is mounted between the carburetor and the cylinder. This flange has a carburetor connecting surface, which faces toward the carburetor, and a cylinder connecting surface which faces toward the cylinder. Referred to the flow direction in the intake channel, the air channel divides upstream of the cylinder connecting surface into two branches. The first branch has a first longitudinal center axis and the second branch has a second longitudinal center axis. The intersect points of the center axes with the connecting surfaces are mutually connected via an imaginary connecting line in the carburetor connecting surface or the cylinder connecting surface. The two connecting lines conjointly define an angle ? in the carburetor connecting surface with this angle being greater than 0°.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: June 10, 2014
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Jörg Elfner, Fevronia Konstantinidou, Karsten Schmidt, Michael Raffenberg
  • Patent number: 8733312
    Abstract: A manifold including first and second divider bodies each having a carburetor mounting flange. The first divider body includes a first and a second plenum, and the second divider body includes a third and a fourth plenum. A first pair of runners extends from the first port flange to the first plenum; a second pair of runners extends from the first port flange to the third plenum; a third pair of runners extends from the second port flange to the second plenum; and a fourth pair of runners extends from the second port flange to the fourth plenum. Accordingly, in operation, each plenum will present only one carburetor venturi to the cylinder in a low-RPM, low-throttle opening induction event, thus keeping the peak velocity through the carburetor's venturi high even at low RPM.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: May 27, 2014
    Inventor: Wayne Kever
  • Publication number: 20140116372
    Abstract: A gasket which is mounted in a groove formed in a first member and is elastic and which seals between the first member and a second member, including: a first contact section that comes in contact with the second member; a second contact member that comes in contact with one sidewall surface of the groove which is formed in such a way that a width of the groove becomes larger toward an opening section of the groove from a bottom of the groove; a third contact section that comes in contact with another sidewall surface of the groove which is formed in such a way that a width of the groove becomes larger toward the opening section from the bottom; and a fourth contact section that comes in contact with the bottom.
    Type: Application
    Filed: July 2, 2012
    Publication date: May 1, 2014
    Applicant: MIKUNI CORPORATION
    Inventor: Etsuo Nishimura
  • Publication number: 20140076258
    Abstract: A saddle-ride type vehicle is capable of reducing influence of travelling wind on an open end of an air hose, thus preventing fluctuations in the internal pressure of a float chamber of a carburetor. The saddle-ride type vehicle includes a carburetor placed rearward of an engine and an air cleaner placed rearward of the carburetor. An air hose configured to regulate the internal pressure of a float chamber of the carburetor is connected to the carburetor. A recessed portion is provided at a side wall of an air-cleaner case of the air cleaner, the side wall being located along a lateral side of the vehicle. An open end of the air hose is placed at the recessed portion of the air-cleaner case.
    Type: Application
    Filed: August 27, 2013
    Publication date: March 20, 2014
    Applicant: HONDA MOTOR CO., LTD
    Inventors: Atsushi Kobayashi, Takashi Yamamoto
  • Patent number: 8640667
    Abstract: A mounting device can mount an intake manifold to an engine and includes a bending moment applying device applying a bending moment to the intake manifold as the intake manifold is mounted to the engine.
    Type: Grant
    Filed: January 6, 2011
    Date of Patent: February 4, 2014
    Assignee: Aisan Kogyo Kabushiki Kaisha
    Inventors: Ichiro Hisada, Shoubin Han, Hironori Tanikawa
  • Publication number: 20130220260
    Abstract: The present invention relates to an air supply apparatus for a two-stroke stratified scavenging combustion engine. The air supply apparatus includes an air cleaner having an air outlet and a partition, such that the partition substantially divides the air outlet into a first section and a second section. The air supply apparatus further includes a carburetor. The carburetor includes a passage, a throttle valve and a choke valve, such that the throttle valve and the choke valve substantially divides the passage into an air portion and a mixture portion. Further, a first aperture in communication with the first section of the air outlet is provided corresponding to the air portion, and the second aperture in communication with the second section of the air outlet is provided corresponding to the mixture portion. Moreover, an area of the first section is different from that of the second section.
    Type: Application
    Filed: August 20, 2010
    Publication date: August 29, 2013
    Applicant: HUSQVARNA ZENOAH CO., LTD.
    Inventors: Takashi Ohniwa, Akiyoshi Sekine
  • Patent number: 8453617
    Abstract: One embodiment of a device and method for controlling or restricting the air-fuel mixture into an internal combustion engine having a body member rigidly mounted between the air-fuel metering device and the engine intake, a slidably insertable restrictor plate, and a retaining and sealing cover. The body member may contain a single spacer or two spacers and may contain either a slot or a groove that communicates with the plate. The plate may contain a plurality of bore holes and multiple distinct plates can be made in order to achieve various and linear amounts of restriction. The plate can be easily and quickly changed depending on the amount of restriction desired. One or more embodiments of the device can be used on engines in various motorized vehicles and in various motorsports, such as drag racing. Other embodiments are described and shown.
    Type: Grant
    Filed: September 16, 2010
    Date of Patent: June 4, 2013
    Inventor: Brett T. Olson
  • Patent number: 7806096
    Abstract: In line carburetor (104) is mounted to a manifold (140) over the engine (800). The barrels of the carburetor deliver air/fuel suspensions to concentrated positions (152) of the manifold, with the concentrated positions being at opposite ends of the engine. The ports leading from the manifold to the runners are equally positioned about the concentrated positions (152) so that the runners are of substantially equal length and resistance, thereby providing more uniform delivery of the air/fuel suspension to the cylinders.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: October 5, 2010
    Inventor: Barry S. Grant
  • Publication number: 20090217899
    Abstract: An intake manifold for an internal combustion engine that distributes a fuel-air mixture to an engine. The manifold includes a box-shaped chamber defined by at least four sidewalls. The chamber is mounted atop multiple intake runners, and opens to an intake plenum to which multiple runners are joined. The box-shaped chamber can include a mounting flange to which a substantially planar cover plate can be mounted to close the top of the box-shaped chamber. The cover plate can define at least one hole to accommodate a carburetor, throttle body or other fuel-air mixture delivery device.
    Type: Application
    Filed: February 28, 2008
    Publication date: September 3, 2009
    Applicant: DART MACHINERY, LTD.
    Inventors: William R. Glidden, Richard A. Maskin
  • Publication number: 20090184433
    Abstract: An air intake component and assembly, as well as an associated carburetor assembly and related method of assembly, are disclose. In at least some embodiments, the intake component includes a surface capable of being coupled at least indirectly to a carburetor assembly, where the surface includes first and second orifices, a first channel capable of communicating engine intake air from a first location to the first orifice of the surface, and a second channel by which at least one of the first location and a second location is connected to the second orifice. The second channel is capable of communicating at least one of a primer air pressure pulse from the at least one location to the second orifice and fuel fumes from the second orifice to the at least one location. In at least some further embodiments, the intake component can be fitted with any of several interchangeable covers.
    Type: Application
    Filed: January 22, 2008
    Publication date: July 23, 2009
    Inventors: Russell J. Dopke, Benji J. Bink, Dale D. Snyder
  • Patent number: 7523730
    Abstract: A carburetor spacer is provided with an isolation member to isolate the flow of atomized fuel from a carburetor to an intake manifold of an internal combustion engine comprising first and second hollow members fitting one inside the other and an elastomeric member interposed between said fitted hollow members. The elastomeric member also serving to thermally insulate the flow of fuel-oxidizer from heat produced by the engine. Thus, the isolation member helps prevent the fuel from reverting to a liquid state before being introduced into the cylinders of the engine and by reducing the heat input to the fuel-oxidizer mixture, less expansion of the mixture occurs before being introduced into the engine's cylinders. Less expansion results in more of the mixture of the fuel-oxidizer can be input to the cylinders resulting in a greater power output by the engine.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: April 28, 2009
    Inventor: Keith D. Wilson
  • Publication number: 20080302326
    Abstract: In line carburetor (104) is mounted to a manifold (140) over the engine (800). The barrels of the carburetor deliver air/fuel suspensions to concentrated positions (152) of the manifold, with the concentrated positions being at opposite ends of the engine. The ports leading from the manifold to the runners are equally positioned about the concentrated positions (152) so that the runners are of substantially equal length and resistance, thereby providing more uniform delivery of the air/fuel suspension to the cylinders.
    Type: Application
    Filed: June 5, 2007
    Publication date: December 11, 2008
    Inventor: Barry S. Grant
  • Publication number: 20080141968
    Abstract: An intake manifold assembly is provided having a plenum and an intake runner in communication with the plenum. The intake runner has an outlet end. A selectively closeable throttle plate is disposed within the intake runner and is operable to selectively limit the flow of intake air through the intake runner. The throttle plate is selectively and variably movable between a fully opened position and a fully closed position. An orifice, defined by one of the intake runner and the throttle plate, has an opening area of approximately fifteen percent or less of a cross sectional area of the outlet end. An internal combustion engine incorporating the intake manifold assembly is also disclosed.
    Type: Application
    Filed: December 18, 2006
    Publication date: June 19, 2008
    Applicant: GM Global Technology Operations, Inc.
    Inventors: JIAN JUN ZHANG, Ko-Jen Wu, William A. Berry, James C. Elmslie
  • Publication number: 20080135009
    Abstract: A carburetor spacer is provided with isolation means to isolate the flow of atomized fuel from a carburetor to an intake manifold of an internal combustion engine comprising first and second hollow members fitting one inside the other and an elastomeric member interposed between said fitted hollow members. The elastomeric member also serving to thermally insulate the flow of fuel-oxidizer from heat produced by the engine. Thus, the isolation means helps prevent the fuel from reverting to a liquid state before being introduced into the cylinders of the engine and by reducing the heat input to the fuel-oxidizer mixture, less expansion of the mixture occurs before being introduced into the engine's cylinders. Less expansion means more of the mixture of the fuel-oxidizer can be input to the cylinders resulting in a greater power output by the engine.
    Type: Application
    Filed: December 12, 2007
    Publication date: June 12, 2008
    Inventor: Keith D. Wilson
  • Publication number: 20080115754
    Abstract: An induction regulator (1) for an internal combustion engine is described wherein the regulator (1) comprises at least one perforated member (6) means for locating said perforated member (6) in the inlet manifold of an engine and further comprising adjustment means (10) to permit the angle of the perforated member (6) to be varied with respect to the inlet manifold. An induction regulator (1) apparatus is also described along with retro-fit comprising an induction regulator of the present invention as well as a method of improving the fuel efficiency of an engine using an induction regulator (1) of the present invention.
    Type: Application
    Filed: June 9, 2005
    Publication date: May 22, 2008
    Inventor: Richard James Facer
  • Patent number: 7107962
    Abstract: A forced air induction system (10) constructed in accordance with the principles of a preferred embodiment of the present invention and configured for supplying compressed induction fluid to an internal combustion engine (E) for powering a vehicle (V) is disclosed. The illustrated forced air induction system (10) broadly includes a blower (12) for compressing induction fluid for the engine (E) and an improved carburetor hat (14) in communication with the blower (12) for delivering the compressed induction fluid to the carburetor (C). The illustrated blower (12) is a centrifugal supercharger. The illustrated carburetor hat (14) defines a neck section (26), a throat section (28), and an internal chamber (30) disposed between the neck and throat sections (26,28).
    Type: Grant
    Filed: October 27, 2004
    Date of Patent: September 19, 2006
    Assignee: Accessible Technologies, Inc.
    Inventors: Christopher S. Spies, Daniel W. Jones
  • Patent number: 7017544
    Abstract: Use of an vibration damper to dampen vibration transmitted from an engine to a carburettor is found to enhance carburettor and therefore engine performance. The vibration damper is conveniently placed axially between the carburettor and an end of the intake manifold, and may take the form of a laminate of an elastomeric block adhered between and upstream and a downstream metal plate. Fasteners can extend from the metal plates into suitable apertures within the carburettor housing and inlet manifold without traversing the elastomeric block thereby enhancing the efficacy of the damper.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: March 28, 2006
    Assignee: Ames Nominees Pty. Ltd.
    Inventor: Andrew Kostecki
  • Patent number: 6889647
    Abstract: A connector assembly including the resilient member and two band clamps includes a feature for preventing the band clamps from overlapping with each other when the band clamps are tightened. The band clamps can include projections extending from an outer surface thereof in order to prevent the band clamps from overlapping with each other. Alternatively, one of the members that are being connected via the connector assembly can include an additional member configured to be aligned with a projection on one of the band clamps.
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: May 10, 2005
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Masakazu Kono
  • Patent number: 6886526
    Abstract: An air delivery device for use in delivering air from the outlet of a turbocharger to a carburetor. The device has an intake passage extending from an inlet through an appended portion extending to an outlet. A flow divider extends diametrically through the passage from the inlet to the outlet. The flow divider provides passage into an upper channel and a lower channel. The upper channel delivers air to the front barrels of a four-barrel carburetor and the upper channel delivers air to the rear barrels of a four-barrel carburetor. The intake passage has a frustoconical shape which increases in diameter from the inlet to the bend portion.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: May 3, 2005
    Assignee: Superior Air Flow Technologies, Inc.
    Inventor: Gordon Bishop
  • Patent number: 6880523
    Abstract: An engine cylinder induction air quantity measuring apparatus includes a controller to calculate an intake manifold inside air quantity of air in an intake manifold of the engine, from a sensed intake air quantity by performing a balance calculation to calculate a balance between an intake manifold inflow air quantity of air flowing into the intake manifold, and an intake manifold outflow air quantity of air flowing out of the intake manifold. In an engine stopping process to stop the engine, the controller controls a throttle opening of a throttle valve to a predetermined stop mode opening greater than an idling mode opening for an idle operation of the engine.
    Type: Grant
    Filed: January 15, 2003
    Date of Patent: April 19, 2005
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tetsuya Iwasaki, Shouichi Hayase
  • Patent number: 6868813
    Abstract: An elastic connecting piece (1) is mounted between a carburetor (4) and an inlet channel (3) of an internal combustion engine (2). The engine (2) is especially an engine of a portable handheld motor-driven work apparatus such as a motor-driven chain saw, cutoff machine or the like. The connecting piece (1) includes a peripherally extending expansion fold (5) arranged between its ends in order to compensate for changes in length. The expansion fold (5) subdivides the connecting piece (1) into a carburetor-end section (6) and into an engine-end section (7). The annular gap (28) of the expansion fold (5) can be bridged by a seal lip (8). The connecting piece (1) includes a peripherally extending seal seat (9) of axial length (g) in the region of the expansion fold (5). The seal lip (8) can be placed in seal-tight contact with the seal seat (9) and substantially closes the expansion fold (5) fluid tight to the interior space of the connecting piece (1).
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: March 22, 2005
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Helmut Zimmermann, Michael Joos, Andreas Radtke, Stefan Leuze
  • Patent number: 6595175
    Abstract: A carburetor spacer for installation between a carburetor and an intake manifold which effects increased horsepower in engine operation. More specifically, this invention relates to a carburetor spacer having a particular shape such that improved air/fuel flow to the intake manifold is achieved.
    Type: Grant
    Filed: September 12, 2002
    Date of Patent: July 22, 2003
    Inventors: Thomas D. Capoferi, Fred L. Capoferi
  • Patent number: 6536395
    Abstract: The invention is directed to a carburetor arrangement in a work apparatus having an internal combustion engine (2). The inlet channel (7) of the engine is connected via a connecting tube (8) to the intake channel section (9) of the membrane carburetor (4). The connecting tube (8) projects through a partition wall (3) arranged between the engine (2) and the carburetor (4). The carburetor (4) is fixed against the partition wall (3). Also, an intake air filter (70) is provided and supplies combustion air. The intake air filter is connected to the end (19) of the intake channel section (9) facing away from the partition wall (3). An attachment of the carburetor is provided without tools in that the carburetor is held clamped in the longitudinal direction of the intake channel section (9) between the partition wall (3) and a wall (22) of the air filter housing (20).
    Type: Grant
    Filed: September 28, 2000
    Date of Patent: March 25, 2003
    Assignee: Andreas Stihl AG & Co.
    Inventor: Harald Schliemann
  • Patent number: 6382160
    Abstract: The available space within the apparatus housing (2) in the portable handheld work apparatus is limited so that the individual components have to be accommodated in a tight space. In work apparatus having internal combustion engines, this means that the carburetor (7) is flange connected directly to the engine block (12) in the region of the inlet opening (11). A spacer (9) is provided in order to avoid unfavorable heat effects on the carburetor (7) and to provide an advantageous mounting position. The spacer (9) is positioned between the engine (10) and the carburetor (7). The spacer (9) has a channel section (18) which runs diagonally to the respective flange planes (19, 20) of the spacer (9). This channel section (18) connects the intake channel (21) of the carburetor (7) to the inlet opening (11) of the engine (10).
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: May 7, 2002
    Assignee: Andreas Stihl AG & Co.
    Inventors: Markus Hüsges, Gerhard Stoll, Maximilian Stell
  • Publication number: 20010037784
    Abstract: The available space within the apparatus housing (2) in the portable handheld work apparatus is limited so that the individual components have to be accommodated in a tight space. In work apparatus having internal combustion engines, this means that the carburetor (7) is flange connected directly to the engine block (12) in the region of the inlet opening (11). A spacer (9) is provided in order to avoid unfavorable heat effects on the carburetor (7) and to provide an advantageous mounting position. The spacer (9) is positioned between the engine (10) and the carburetor (7). The spacer (9) has a channel section (18) which runs diagonally to the respective flange planes (19, 20) of the spacer (9). This channel section (18) connects the intake channel (21) of the carburetor (7) to the inlet opening (11) of the engine (10).
    Type: Application
    Filed: May 2, 2001
    Publication date: November 8, 2001
    Inventors: Markus Husges, Gerhard Stoll, Maximilian Eberhardt
  • Publication number: 20010023680
    Abstract: The invention relates to a four-stroke internal combustion engine with at least two inlet valves and an inlet flow path with at least two inlet ports per cylinder which branch off from a common inlet pipe and are guided separately up to the inlet valves and of which at least one inlet port is designed as a charge loading port and at least one inlet port as a volumetric port, with a throttle device for volumetric control being provided in the inlet flow path and the inlet flow path being connected with a fuel supply device. In order to achieve in the simplest possible way an improvement of the exhaust gas quality at low fuel consumption it is provided that the fuel supply device is formed by a joint carburettor for both inlet ports, with preferably the carburettor being arranged in the zone of the branching of the inlet ports from the inlet pipe.
    Type: Application
    Filed: March 12, 2001
    Publication date: September 27, 2001
    Inventor: Franz Laimbock
  • Patent number: 6276326
    Abstract: A connecting device (1) for a fuel supply unit (2), such as a carburetor, to a cylinder (3) of an internal combustion engine, said connecting device is mainly composed of a flexible inlet bellow (4) with an inlet duct (5). The bellow (4) has at its one end a first flange part (6), which surrounds the inlet duct and furthest out has a projecting outer edge (7) intended to be pushed upon a projecting inlet stud (8) of the cylinder, and the inlet bellow is at its other end mounted to the fuel supply unit (2). The inlet stud (8) has besides an inlet opening (13) at least one cavity (14) by the side of the inlet opening and the inlet bellow is arranged with at least one from the first flange part (6) projecting nose part (15) intended to protrude into the cavity (14) when the inlet bellow in an axial direction is being pushed upon the inlet stud (8).
    Type: Grant
    Filed: May 26, 2000
    Date of Patent: August 21, 2001
    Assignee: Aktiebolaget Electrolux
    Inventors: Pär Martinsson, Jörgen Pettersson
  • Patent number: 6263851
    Abstract: An air inlet device for an engine powering a water propulsion device of a watercraft, the watercraft having a hull defining an engine compartment in which the engine is positioned, is disclosed. The engine has a body defining at least one combustion chamber and an output shaft arranged to drive the water propulsion device. Air is supplied to the combustion chamber of the engine through the air inlet device. This device includes an intake pipe extending outwardly from the engine and an air box connected to the intake pipe. The air box has a cover having a top and a bottom and defining an interior air chamber, an air inlet provided near the top of the air box and a drain provided through the bottom of the air box. The intake pipe has a passage therethrough leading from the interior air chamber of the air box to said engine. The air box has a width at the top which is greater than a width at the bottom.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: July 24, 2001
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Yasuhiko Henmi
  • Patent number: 6260536
    Abstract: An intake passage device is provided for an internal combustion engine having carburetor communicated with a connecting projection of an intake port of a cylinder of the engine, wherein the diameter of the connecting projection becomes smaller toward the inside of the intake port. A connecting pipe is provided for communicating the carburetor with the intake port. An inner end of the connecting pipe is engaged in the connecting projection. There is formed a plurality of one communication passages formed in the connecting pipe for communicating an inside of the connecting pipe with a space between an inside wall of the connecting projection and an outside wall of the connecting pipe.
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: July 17, 2001
    Assignee: Fuji Robin Kabushiki Kaisha
    Inventors: Mitsunori Watanabe, Hiroshi Kubota
  • Patent number: 6209502
    Abstract: An intake manifold for a four-cycle internal combustion engine with multiple stages to reduce imbalances in volumetric efficiency and air/fuel ratio. The intake manifold utilizes at least two ram stages coupled by a plenum chamber. The first stage includes a ram tube that carries the air/fuel mixture from the carburetor, or throttle body to the plenum chamber. The second stage includes at least two ram tubes that carry the air/fuel mixture from the plenum to a plurality of intake valves through cylinder head intake ports. The plenum chamber acts as a buffer between each intake valve and the carburetor or throttle body. The air/fuel mixture enters the first stage ram tube and passes into the plenum chamber. These gases then pass into either one of the second stage ram tubes, depending on which cylinder is at its intake stroke. By drawing the air/fuel mixture from the plenum instead of directly from the first stage ram tube, differences in the air/fuel ratio and volumetric efficiency are minimized.
    Type: Grant
    Filed: April 6, 1999
    Date of Patent: April 3, 2001
    Inventors: Gregory G. Davis, Kenneth Thurm