# US 7,607,413 B2 · Induction system for an internal combustion engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,607,413 B2 - Document ID: US7607413B2 - Status: Granted - Kind: B2 - Application number: 10/594,857 - Filed: 2004-03-20 - Published: 2008-08-07 - Granted: 2009-10-27 - Earliest claimed: 2004-03-20 - Inventors: Charlie Bamber; Philip Virr; Stuart Lever; Jon Hilton - Web page: https://patentgrep.com/patent/US7607413B2 ## CPC - F02M 35/10354: {Joining multiple sections together (joining plastic materials together in general B29C65/00)} - F02B 27/005: {Oscillating pipes with charging achieved by arrangement, dimensions or shapes of intakes pipes or chambers; Ram air pipes} - F02B 27/0231: {Movable ducts, walls or the like (F02B27/0257 takes precedence)} - F02B 27/04: in exhaust systems only, e.g. for sucking-off combustion gases - F02M 9/10: having valves, or like controls, of elastic-wall type for controlling the passage, or for varying cross-sectional area, of fuel-air mixing chambers {or of the entry passage} - F02M 35/10032: {specially shaped or arranged connecting duct between carburettor or air inlet duct and the plenum chamber; specially positioned carburettors or throttle bodies with respect to the plenum chamber} - F02M 35/10039: {Intake ducts situated partly within or on the plenum chamber housing} - F02M 35/10052: {special shapes or arrangements of plenum chambers; Constructional details} - F02M 35/10098: {Straight ducts} - F02M 35/10118: {with variable cross-sections of intake ducts along their length; Venturis; Diffusers} - F02M 35/10124: {Ducts with special cross-sections, e.g. non-circular cross-section} - F02M 35/116: for engines with cylinders in V-arrangement or arranged oppositely relative to the main shaft - F02M 35/1244: {using interference; Masking or reflecting sound} - Y02T 10/12: Improving ICE efficiencies - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An induction system for an internal combustion engine, having a combustion chamber and an intake port in periodic communication with the combustion chamber, includes an intake tube having a lower trumpet (41) and an upper trumpet (42), each having an upper end, a lower end and a length; a transition section (43) extending between the upper end of the lower trumpet and the lower end of the upper trumpet; wherein the lower trumpet is connectable at its lower end to the intake port (22) of an engine and has an inner transition diameter (48) proximal its upper end, and wherein the upper trumpet has an inner expansion diameter (55) that is between about 68 percent and 217 percent greater than the transition diameter. ## Claims ### Claim 1 An induction system for an internal combustion engine having a combustion chamber and an intake port in periodic communication with the combustion chamber, comprising: an intake tube having a lower trumpet and an upper trumpet, each having an upper end, a lower end and a length; a transition section extending between the upper end of said lower trumpet and the lower end of said upper trumpet; wherein said lower trumpet is connectable at its lower end to the intake port of an engine and has an inner transition diameter proximal its upper end, and wherein said upper trumpet has an inner expansion diameter that is between about 68 percent and 217 percent greater than the transition diameter. ### Claim 2 (depends on 1) The induction system of claim 1 wherein expansion diameter is between about 90 percent and 130 percent greater than the transition diameter. ### Claim 3 (depends on 1) The induction system of claim 1 wherein said upper trumpet is generally cylindrical with a constant expansion diameter. ### Claim 4 (depends on 1) The induction system of claim 1 wherein each of said upper and lower trumpets have centerlines that are mutually aligned. ### Claim 5 (depends on 1) The induction system of claim 1 wherein each of said upper and lower trumpets have centerlines and the centerline of said upper trumpet is offset from the centerline of said lower trumpet. ### Claim 6 (depends on 5) The induction system of claim 5 wherein the centerline of said upper trumpet is offset from the centerline of said lower trumpet by about 25 percent of the expansion diameter of said upper trumpet. ### Claim 7 (depends on 1) The induction system of claim 1 wherein the inner expansion diameter is about 68 percent greater than the transition diameter. ### Claim 8 (depends on 1) The induction system of claim 1 wherein the inner expansion diameter is about 217 percent greater than the transition diameter. ### Claim 9 (depends on 1) The induction system of claim 1 wherein each of said upper and lower trumpets have centerlines, and the centerline of said upper trumpet forms an offset angle with the centerline of said lower trumpet, the offset angle being greater than zero degrees. ### Claim 10 (depends on 9) The induction system of claim 9 wherein the offset angle is not less than about 20 degrees. ### Claim 11 (depends on 1) The induction system of claim 1 wherein said transition section has a floor and wherein said induction system further includes a trumpet insert positioned against said floor and extending up into said upper trumpet, said insert effectively extending the length of said lower trumpet and decreasing the length of said upper trumpet. ### Claim 12 (depends on 11) The induction system of claim 11 wherein said insert has an inner insert diameter, at least a portion of which is substantially the same as the transition diameter of said lower trumpet. ### Claim 13 (depends on 12) The induction system of claim 12 wherein the inner surface of said insert is generally cylindrical. ### Claim 14 (depends on 12) The induction system of claim 12 wherein the inner surface of said insert is generally frustoconical. ### Claim 15 (depends on 12) The induction system of claim 12 wherein the inner surface of said insert is generally arcuate. ### Claim 16 (depends on 12) The induction system of claim 12 wherein at least a portion of the insert diameter is substantially the same as the expansion diameter of said upper trumpet. ### Claim 17 (depends on 1) The induction system of claim 1 wherein each of said upper and lower trumpets have centerlines, and the centerline of said upper trumpet is substantially straight. ### Claim 18 (depends on 1) The induction system of claim 1 wherein each of said upper and lower trumpets have centerlines, and the centerline of said upper trumpet is substantially curved. ### Claim 19 (depends on 1) The induction system of claim 1 wherein each of said upper and lower trumpets have centerlines, and the centerline of said upper trumpet is angled. ### Claim 20 (depends on 1) The induction system of claim 1 further including a plurality of spacers sized and configured to be interposed between said upper trumpet and said transition section to vary the overall length of said upper trumpet. ### Claim 21 An induction system for an internal combustion engine having a combustion chamber and an intake port in periodic communication with the combustion chamber, comprising: an intake tube having a lower trumpet and an upper trumpet, each having an upper end, a lower end and a length; a transition section extending between the upper end of said lower trumpet and the lower end of said upper trumpet; wherein said lower trumpet is connectable at its lower end to the intake port of an engine and has an inner transition area proximal its upper end, and wherein said upper trumpet has an inner expansion area that is between about 182 percent and 905 percent greater than the transition area. ### Claim 22 (depends on 21) The induction system of claim 21 wherein the expansion area is between about 360 percent and 530 percent greater than the transition diameter. ### Claim 23 An induction system for an internal combustion engine having a plurality combustion chambers and intake ports in periodic communication with the combustion chambers, comprising: a plurality of lower trumpets, each having an upper end, a lower end and a length; a trumpet pack including a plurality of interconnected upper trumpets, each upper trumpet having an upper end, a lower end and a length; a transition section extending between the upper end of each lower trumpet and the lower end of each upper trumpet; wherein said lower trumpets are each connectable at their lower ends to the intake ports of an engine and have an inner transition diameters proximal their upper end, and wherein said upper trumpets each have an inner expansion diameter that is between about 68 percent and 217 percent greater than the transition diameters.