US3744463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intake manifold for internal combustion engines having a sudden enlargement in the flow path of each runner
Assignee: EDELBROCK EQUIP CO
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Filing: 1971-04-02
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Granted: 1973-07-10
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Expires: 1991-04-02
Abstract
Abstract A sudden enlargement, in the form of a step, is provided proximate the entrance of each runner of a manifold to the ports of an engine and where mixture velocity is relatively low with respect to mixture velocity elsewhere in the same velocity profile. The enlargements control reverse mixture flow and increase the amount of mixture entering the engine''s cylinders. It is believed that this increase in flow is partially due to a reduction or elimination of boundary layer separation in the inlet port. The geometry of the runners is such as to promote relatively high mixture velocity. Specifically, the crosssectional area of each runner progressively diminishes downstream from the entrance to the runner at the manifold''s plenum.
Inventors
- 👤 J Mcfarland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:41
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/104; F02M35/116; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02M35/10006; F02M35/10026; F02M35/10052; F02M35/10072; F02M35/10091; F02M35/10124; F02B2075/1804; F02B2075/1832; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/4392
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
84 words
An improved manifold for use in a carburetted internal combustion engine comprising: a. a runner for each cylinder of the engine, each runner being adapted to communicate an associated inlet port of the engine with a carburetor; and b. each runner providing a sudden enlargement in the flow path it defines in the vicinity of its exit into the inlet port and only in a zone where the stream mixture velocity is low relative to the stream mixture velocities in the same velocity profile.
Claim 2
Dependent Claim
84 words
An improved manifold for use in a carburetted internal combustion engine comprising: a. a runner for each cylinder of the engine, each runner being adapted to communicate an associated inlet port of the engine with a carburetor; and b. each runner providing a sudden enlargement in the flow path it defines in the vicinity of its exit into the inlet port and only in a zone where the stream mixture velocity is low relative to the stream mixture velocities in the same velocity profile.
Claim 3
Dependent Claim
28 words
The improved manifold claimed in claim 1 wherein the manifold includes a plenum common to all the runners to receive a gasoline-air mixture from a single four-barrel carburetor.
Claim 4
Dependent Claim
30 words
The improved manifold claimed in claim 1 wherein the cross-sectional area of each of the runners progressively diminishes in the direction of the runner''s exit into its associated inlet port.
Claim 5
Dependent Claim
22 words
The improved manifold claimed in claim 3 wherein the periphery in cross section bounding the flow path of each runner is quadrilateral.
Claim 6
Dependent Claim
15 words
The improved manifold claimed in claim 1 wherein the manifold is of the ram type.
Claim 7
Dependent Claim
31 words
The improved manifold claimed in claim 5 wherein the manifold is adapted to receive two four-barrel carburetors and independent runners for each of the inlet ports of the engine are provided.
Claim 8
Dependent Claim
105 words
An improved manifold for carburetted internal combustion engines comprising: a. a plenum for receiving a mixture of gasoline and air from a carburetor; b. a runner for each of the cylinders of the engine extending from the plenum to an exit disposed for registration with an associated inlet port of the engine; and c. each runner defining a sudden enlargement in the flow path it defines in the vicinity of its exit into the inlet port and only in a zone where the stream mixture velocity is low relative to the stream mixture velocities in the same velocity profile, the enlargement facing the inlet port.
Claim 9
Dependent Claim
105 words
An improved manifold for carburetted internal combustion engines comprising: a. a plenum for receiving a mixture of gasoline and air from a carburetor; b. a runner for each of the cylinders of the engine extending from the plenum to an exit disposed for registration with an associated inlet port of the engine; and c. each runner defining a sudden enlargement in the flow path it defines in the vicinity of its exit into the inlet port and only in a zone where the stream mixture velocity is low relative to the stream mixture velocities in the same velocity profile, the enlargement facing the inlet port.
Claim 10
Dependent Claim
36 words
The improved manifold claimed in claim 7 wherein the cross-sectional area of the flow path defined by each runner gradually, progressively and continuously diminishes from the entrance to the runner in the plenum to the exit.
Claim 11
Dependent Claim
27 words
The improved manifold claimed in claim 7 wherein the sudden enlargement of each runner is defined by a mismatch between the runner and its associated inlet port.
Claim 12
Dependent Claim
41 words
The improved manifold claimed in claim 7 wherein the sudden enlargement of each runner is defined at the runner''s exit by runner material presenting in an installed manifold a step at the interface between the runner and its associated inlet port.
Claim 13
Dependent Claim
58 words
The improved manifold claimed in claim 10 wherein each runner presents a zone of line-of-sight communication between the plenum and the runner''s associated inlet port, the line-of-sight in the cross section of the runner containing the step corresponding to the zone where stream mixture velocity is high relative to stream mixture velocity in the vicinity of the step.
Claim 14
Dependent Claim
28 words
The improved manifold claimed in claim 11 wherein the flow path of each runner diminIshes in cross-sectional area from the entrance to the runner to the runner''s exit.
Claim 15
Dependent Claim
109 words
An improved ram-type manifold for use with a carburetted internal combustion engine comprising: a. a runner for each cylinder of the engine, the center of each runner lying in a plane generally normal to the entrance to the engine inlet port associated with the runner and curving into a generally vertical attitude; and b. each runner defining an enlargement in the flow path it defines which faces the exit of the runner and which lies in the vicinity of the runner exit in a zone where stream mixture velocity is low relative to the stream mixture velocities in the same velocity profile, the enlargement being only in the zone.
Claim 16
Dependent Claim
109 words
An improved ram-type manifold for use with a carburetted internal combustion engine comprising: a. a runner for each cylinder of the engine, the center of each runner lying in a plane generally normal to the entrance to the engine inlet port associated with the runner and curving into a generally vertical attitude; and b. each runner defining an enlargement in the flow path it defines which faces the exit of the runner and which lies in the vicinity of the runner exit in a zone where stream mixture velocity is low relative to the stream mixture velocities in the same velocity profile, the enlargement being only in the zone.
Claim 17
Dependent Claim
41 words
The improved manifold claimed in claim 13 wherein the enlargement of each runner is defined at the runner''s exit by the wall of the runner presenting, when installed, a step at the interface between the runner and its associated inlet port.
Claim 18
Dependent Claim
28 words
The improved manifold claimed in claim 14 wherein the flow path of each runner diminishes in cross-sectional area from the entrance to each runner to the runner''s exit.
Claim 19
Dependent Claim
26 words
The improved manifold claimed in claim 13 wherein the enlargement of each runner is defined in the wall of the runner upstream from the runner''s exit.
Claim 20
Dependent Claim
28 words
The improved manifold claimed in claim 16 wherein the flow path of each runner diminishes in cross-sectional area from the entrance to each runner to the runner''s exit.
Claim 21
Dependent Claim
115 words
In combination with a carburetted internal combustion engine having an inlet port for each of a plurality of cylinders, an improved manifold comprising: a. a runner for each cylinder, each runner being adapted to communicate an associated inlet port of the engine with a carburetor of the engine; and b. each runner defining with its associated inlet port an enlargement in the flow path the runner and inlet port define, the enlargement facing the inlet port and being proximate the junction between the inlet port and runner in a zone where the stream mixture velocity is low relative to the mixture velocities elsewhere in the same velocity profile, the enlargement being only in the zone.
Claim 22
Dependent Claim
115 words
In combination with a carburetted internal combustion engine having an inlet port for each of a plurality of cylinders, an improved manifold comprising: a. a runner for each cylinder, each runner being adapted to communicate an associated inlet port of the engine with a carburetor of the engine; and b. each runner defining with its associated inlet port an enlargement in the flow path the runner and inlet port define, the enlargement facing the inlet port and being proximate the junction between the inlet port and runner in a zone where the stream mixture velocity is low relative to the mixture velocities elsewhere in the same velocity profile, the enlargement being only in the zone.
Claim 23
Dependent Claim
31 words
The combination claimed in claim 18 wherein the cross-sectional area of the flow path defined by each of the runners progressively diminishes in the direction of the runner''s associated inlet port.
Claim 24
Dependent Claim
27 words
The combination claimed in claim 19 wherein the manifold includes a plenum common to all the runners to receive a gasoline-air mixture from a single four-barrel carburetor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |