GB2252791A - I.c. engine inlet manifold - Google Patents

I.c. engine inlet manifold Download PDF

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Publication number
GB2252791A
GB2252791A GB9103307A GB9103307A GB2252791A GB 2252791 A GB2252791 A GB 2252791A GB 9103307 A GB9103307 A GB 9103307A GB 9103307 A GB9103307 A GB 9103307A GB 2252791 A GB2252791 A GB 2252791A
Authority
GB
United Kingdom
Prior art keywords
riser bore
port
engine
tubes
port tubes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9103307A
Other versions
GB9103307D0 (en
Inventor
Stephen Peer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Motor Co
Original Assignee
Ford Motor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Motor Co filed Critical Ford Motor Co
Priority to GB9103307A priority Critical patent/GB2252791A/en
Publication of GB9103307D0 publication Critical patent/GB9103307D0/en
Publication of GB2252791A publication Critical patent/GB2252791A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10131—Ducts situated in more than one plane; Ducts of one plane crossing ducts of another plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/005—Oscillating pipes with charging achieved by arrangement, dimensions or shapes of intakes pipes or chambers; Ram air pipes
    • F02B27/006—Oscillating pipes with charging achieved by arrangement, dimensions or shapes of intakes pipes or chambers; Ram air pipes of intake runners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10052—Plenum chambers special shapes or arrangements of plenum chambers; Constructional details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10072—Intake runners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10275—Means to avoid a change in direction of incoming fluid, e.g. all intake ducts diverging from plenum chamber at acute angles; Check valves; Flame arrestors for backfire prevention
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/104—Intake manifolds
    • F02M35/1045—Intake manifolds characterised by the charge distribution between the cylinders/combustion chambers or its homogenisation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

Tubes 14, 15, 16 and 17 are connected at one end to a riser bore 11, the other ends being adapted to be connected to engine inlet ports. The tubes are connected to the riser bore at a level below the ends of the tubes adapted to be connected to the engine, tubes 15, 16 being wound around the riser bore. <IMAGE>

Description

INLET MANIFOLDS FOR INTERNAL COMBUSTION ENGINES The present invention relates to inlet manifolds for internal combustion engines.
In inlet manifolds for internal combustion engines, it is desirable to tune the port tubes so that pulses of induction charge coming from a central delivery riser bore will be delivered to each cylinder when the inlet port of that cylinder is open, thereby improving the ram effect. In order to achieve this, the length of the port tubes must be extended. Furthermore, it is also desirable to have the port tubes of equal length in order to achieve uniform distribution of the induction charge.
Hitherto, in order to achieve these aims, the extension of the manifold to the side of the engine has been significantly increased with consequent undesirable broadening of the engine. Alternatively, it has been proposed to run the port tubes over the rocker cover, but this has the disadvantage of significant increase in the height of the engine and also interfering with access to the valve gear.
The present invention provides means of lengthening the port tubes of the inlet manifold, without significant increase to the width or height of the engine.
According to one aspect of the present invention an inlet manifold comprises a riser bore, a plurality of port tubes, each port tube being connected at one end to the riser bore, the other end of each port tube being adapted to be connected to an inlet port of an engine, the port tube being connected to the riser bore at a level below the end of the port tube adapted to be connected to the engine, one or more of the port tubes being wound around the riser bore.
Positioning of the connection between the port tubes and the riser bore below the level of the connection of the port tubes to the engine and also winding the port tubes around the riser bore, will enable the port tubes to be lengthened without significantly increasing the overall width or height of the engine, use being made or the normally dead space below the inlet manifold.
Preferably the port tubes are connected to the riser bore in cyclic sequence corresponding to the firing order of the cylinders to which the port tubes are connected, so that the intake porting will provide uniform swirl action in the riser bore which will enhance mixing of the induction charge thus providing more uniform mixture distribution. Furthermore, the swirl action will increase the flow velocity of the induction charge into the port tubes. In order to permit connection of the port tubes in cyclic sequence the port tubes may cross over one another, the increased depth of the manifold permitting such cross-overs.
According to a preferred embodiment of the invention the port tubes adapted to be connected to the inlet ports of the engine located closest to the riser bore will be connected to the riser bore on the side thereof remote from the engine and will wrap around the riser bore to a greater extent than the port tubes connected to the inlet ports of the engine more remote from the riser bore, the latter being connected to the riser bore on the side adjacent the engine. In this manner the lengths of the port tubes may be matched.
An embodiment of the invention is now described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is an isometric view of an inlet manifold in accordance with the present invention; Figure 2 is a diagrammatic illustration of the tracks of the port tubes of the manifold illustrated in Figure 1; Figure 3 is a part-sectional side elevation of the manifold illustrated in Figure 1; and Figure 4 is a view similar to Figure 3 of a conventional manifold.
The inlet manifold 10 illustrated in Figures 1 to 3 comprises a riser bore 11 which is closed at its lower end. The upper end 12 of the riser bore 11 is open and has a flange formation 13 by which a down draught carburettor can be attached thereto in conventional manner.
Four port tubes 14, 15, 16 and 17 are connected to the riser bore 11 adjacent its lower closed end, the port tubes 14, 15, 16 and 17 opening to the riser bore 11 through apertures 20, 21, 22 and 23 respectively. The ends 25, 26, 27 and 28 of the port tubes 14, 15, 16 and 17 remote from the riser bore 11 are interconnected by a flange 30, by which the manifold 10 may be secured to an engine, the ends 25, 26, 27 and 28 of port tubes 14, 15, 16 and 17 being connected to the inlet ports of the engine. The apertures 20, 21, 22 and 23 by which the port tubes 14, 15, 16 and 17 are connected to the riser bore 11 are disposed below the level of the ends 25, 26, 27 and 28 which are adapted to be connected to the inlet ports of the engine.
The manifold 10 illustrated in Figure 1 to 3 is designed for a four cylinder engine whose firing order is 1 3 2 4.
Port tubes 15 and 16 which are connected to the inlet ports of cylinders 2 and 3 respectively, wrap around the riser bore 11 and cross over, being connected to the riser bore 11 by apertures 21 and 22 which are staggered axially of the riser bore 11 in order to accommodate the cross-over. Port tubes 14 and 17 which are connected to the inlet ports of cylinders 1 and 4 respectively, are connected to the riser bore 11 by apertures 20 and 23 at points adjacent the respective cylinders. The port tubes 14, 15, 16 and 17 may thereby be made of equal length.
Furthermore, the port tubes 14, 15, 16 and 17 open into the riser bore 11 through apertures 20, 21, 22 and 23, the sequence of the apertures 20, 22, 21, 23 being the same as the firing order of the cylinders of the engine to which the associated port tubes 14, 15, 16, 17 are connected.
By connecting the port tubes 14, 15, 16 and 17 to the riser bore 11 in the sequence described above, as air/fuel mixture is drawn into the riser bore 11 upon porting of the cylinders, the air/fuel mixture will swirl around the riser bore 11 in uniform manner thus enhancing mixing of the air/fuel mixture and also increasing the flow velocity of the air/fuel mixture as it flows into the port tubes 14, 15, 16 and 17.
The invention as described above thus permits the port tubes 14, 15, 16 and 17 to be lengthened and to be made of equal length, without substantially increasing the width or height of the engine, as can be seen from a comparison of the manifold in accordance with the invention as illustrated in Figure 3 and the conventional manifold illustrated in Figure 4. Adjustment of the lengths of the port tubes 14, 15, 16 and 17 in this way, together with sequencing of the connections of the port tubes 14, 15, 16 and 17 with the riser bore 11 will improve air/fuel distribution and will also produce a greater ram effect improving volumetric efficiency of the engine.
Various modifications may be made without departing from the invention. For example, the disposition of the port tubes with respect to the riser bore may be varied to correspond to engines with different firing orders.

Claims (7)

1. An inlet manifold comprising a riser bore, a plurality of port tubes, each port tube being connected at one end to the riser bore, the other end of each port tube being adapted to be connected to an inlet port of an engine, the port tube being connected to the riser bore at a level below the end of the port tube adapted to be connected to the engine, one or more of the port tubes being wound around the riser bore.
2. An inlet manifold according to Claim 1 in which the port tubes are connected to the riser bore in cyclic sequence corresponding to the firing order of the cylinders to which the port tubes are adapted to be connected.
3. An inlet manifold according to Claim 1 or 2 in which the vertical projection of at least one port tube intersects the vertical projection of at least one other port tube.
4. An inlet manifold according to any one of Claims 1 to 3 in which the port tubes are disposed with respect to the riser bore such that their lengths are substantially equal.
5. An inlet manifold according to Claim 4 in which the port tubes adapted to be connected to the inlet ports of the engine located closest to the riser bore will be connected to the riser bore on the side thereof remote from the engine and will wrap round the riser bore to a greater extent than the port tubes connected to the inlet ports of the engine more remote from the riser bore, said port tubes connected to the inlet ports of the engine more remote from the riser bore being connected to the riser bore on the side thereof adjacent to the engine.
6. An inlet manifold according to Claim 5 in which four port tubes are connected to the riser bore, the ends of the port tubes remote from the riser bore being adapted to be connected to the inlet ports of a four cylinder engine, the two inner port tubes wrapping around the riser bore on either side thereof and crossing over on the side of the riser bore remote from the ends adapted to be connected to the inlet ports of the engine, and being connected to the riser bore on that side thereof, the outer port tubes being connected to the riser bore on the side adjacent the ends adapted to be connected to the inlet ports of the engine.
7. An inlet manifold substantially as described herein with reference to, and as shown in, Figures 1 to 3 of the accompanying drawings.
GB9103307A 1991-02-16 1991-02-16 I.c. engine inlet manifold Withdrawn GB2252791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9103307A GB2252791A (en) 1991-02-16 1991-02-16 I.c. engine inlet manifold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9103307A GB2252791A (en) 1991-02-16 1991-02-16 I.c. engine inlet manifold

Publications (2)

Publication Number Publication Date
GB9103307D0 GB9103307D0 (en) 1991-04-03
GB2252791A true GB2252791A (en) 1992-08-19

Family

ID=10690132

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9103307A Withdrawn GB2252791A (en) 1991-02-16 1991-02-16 I.c. engine inlet manifold

Country Status (1)

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GB (1) GB2252791A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5551387A (en) * 1995-02-24 1996-09-03 Ortech Corporation Tuned intake manifold for OTTO cycle engines
GB2321671A (en) * 1997-01-31 1998-08-05 Perkins Ltd I.c. engine inlet manifold with branches of equal length
US6571759B2 (en) * 2000-10-16 2003-06-03 G P Daikyo Corporation Resin intake manifolds and manufacturing process thereof
WO2005088099A2 (en) * 2004-03-11 2005-09-22 Avl List Gmbh Internal combustion engine
EP1614888A3 (en) * 2004-07-09 2006-12-06 AVL List GmbH Internal combustion engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137694A (en) * 1983-04-04 1984-10-10 Ford Motor Co Tuned engine intake manifold
US4867110A (en) * 1987-12-11 1989-09-19 Dr. Ing. H.C.F. Porsche Ag Suction system for a multi-cylinder internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137694A (en) * 1983-04-04 1984-10-10 Ford Motor Co Tuned engine intake manifold
US4867110A (en) * 1987-12-11 1989-09-19 Dr. Ing. H.C.F. Porsche Ag Suction system for a multi-cylinder internal combustion engine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5551387A (en) * 1995-02-24 1996-09-03 Ortech Corporation Tuned intake manifold for OTTO cycle engines
GB2321671A (en) * 1997-01-31 1998-08-05 Perkins Ltd I.c. engine inlet manifold with branches of equal length
GB2321671B (en) * 1997-01-31 2000-09-13 Perkins Ltd An Inlet Manifold for an Internal Combustion Engine
US6571759B2 (en) * 2000-10-16 2003-06-03 G P Daikyo Corporation Resin intake manifolds and manufacturing process thereof
WO2005088099A2 (en) * 2004-03-11 2005-09-22 Avl List Gmbh Internal combustion engine
WO2005088099A3 (en) * 2004-03-11 2006-01-19 Avl List Gmbh Internal combustion engine
EP1614888A3 (en) * 2004-07-09 2006-12-06 AVL List GmbH Internal combustion engine

Also Published As

Publication number Publication date
GB9103307D0 (en) 1991-04-03

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)