{
  "glb": "/models/components/987/airfilter.glb",
  "parts": [
    {
      "id": "eng-intake-001",
      "node": "airFilterBoxAirbox",
      "label": "Air Cleaner Housing (single, engine compartment)",
      "assembly": "Airbox & Filter",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Single air cleaner housing on the driver side of the engine compartment, fed by the driver-side rear-quarter scoop. Carried over unchanged from the 987.1; for 2009 (987.2) only the Helmholtz resonator opening at its output was modified on Boxster models.",
      "componentId": "airfilter"
    },
    {
      "id": "eng-intake-002",
      "node": "airFilters",
      "label": "Air Filter (serviceable element)",
      "assembly": "Airbox & Filter",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Filters particulates from incoming air before it reaches the MAF sensor, throttle valve and combustion chambers. One element in the single 987 air cleaner (the 981 that followed moved to two housings).",
      "componentId": "airfilter"
    },
    {
      "id": "eng-intake-003",
      "node": "intakeDuctsSnorkelTubes",
      "label": "Intake Duct (quarter scoop to air cleaner)",
      "assembly": "Airbox & Filter",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Routes fresh air from the driver-side rear-quarter scoop through the body side into the air cleaner inlet elbow.",
      "componentId": "airfilter"
    },
    {
      "id": "eng-intake-004",
      "node": "massAirflowSensorsMaf",
      "label": "Hot-Film Mass Air Flow Sensor (MAF-7)",
      "assembly": "Sensors",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Single hot-film MAF-7 sensor at the air cleaner outlet measures intake air mass so the DME can calculate fuel delivery. On the 987.2 it reports to the new ME 7.8.2 (2.9) / DFI (3.4) control units.",
      "componentId": null
    },
    {
      "id": "eng-intake-005",
      "node": "throttleBody",
      "label": "Electronic Throttle Valve (single, central)",
      "assembly": "Throttle Bodies",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "One central drive-by-wire throttle valve (electronic accelerator) on the front of the distribution pipe regulates airflow into the resonance intake system for both cylinder banks.",
      "componentId": null
    },
    {
      "id": "eng-intake-006",
      "node": "intakeManifoldBank1",
      "label": "Intake Manifold Bank 1 (Resonance Type)",
      "assembly": "Intake Manifolds",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Plastic resonance intake manifold distributing air to the three Bank 1 cylinders. On the 987.2 the pipe geometry and the integrated resonance chamber in the upper part were redesigned for the new engines, with additional acoustic chambers in the lateral manifolds.",
      "componentId": null
    },
    {
      "id": "eng-intake-007",
      "node": "intakeManifoldBank2",
      "label": "Intake Manifold Bank 2 (Resonance Type)",
      "assembly": "Intake Manifolds",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Plastic resonance intake manifold distributing air to the three Bank 2 cylinders. On the 987.2 the pipe geometry and the integrated resonance chamber in the upper part were redesigned for the new engines, with additional acoustic chambers in the lateral manifolds.",
      "componentId": null
    },
    {
      "id": "eng-intake-008",
      "node": "intakeManifoldResonanceFlapActuator",
      "label": "Tuning & Distribution Pipe Flap Actuators",
      "assembly": "Intake Manifolds",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Vacuum diaphragm cells with electropneumatic switching valves on the resonance tube actuate the switchable tuning flap and distribution pipe flap. On the 3.4-liter DFI the distribution pipe flap opens above ~3,800 rpm and the tuning flap above ~5,300 rpm.",
      "componentId": null
    },
    {
      "id": "eng-intake-009",
      "node": "intakeAirTemperatureSensors",
      "label": "Intake Air Temperature Sensor",
      "assembly": "Sensors",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Monitors intake air temperature, integrated into the MAF sensor housing at the air cleaner outlet, so the DME can correct fuel and ignition timing for air density.",
      "componentId": null
    },
    {
      "id": "eng-intake-010",
      "node": "crankcaseBretherPcvValve",
      "label": "Crankcase Breather / PCV Valve and Hoses",
      "assembly": "Crankcase Ventilation",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Returns crankcase blow-by gases back to the intake tract to reduce emissions and maintain crankcase vacuum.",
      "componentId": null
    },
    {
      "id": "eng-intake-011",
      "node": "airboxToThrottleBodyDuctBank1",
      "label": "Intake Tube (Air Cleaner to Throttle Valve)",
      "assembly": "Intake Ducts",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Single corrugated intake tube conveying metered air from the air cleaner outlet and MAF sensor to the central electronic throttle valve — the 987 has one intake tube, not one per bank.",
      "componentId": null
    },
    {
      "id": "air-987-new-001",
      "node": "distributionPipe",
      "label": "Distribution Pipe & Resonance Tube (Twin-Flow)",
      "assembly": "Intake Manifolds",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Oval centre section of the resonance intake system between the two manifolds. A longitudinal partition creates the twin-flow distribution pipe; the switchable distribution pipe flap connects or separates the banks. For 2009 (987.2) the formerly separate resonance tube and distribution pipe were combined into this one housing.",
      "componentId": null
    },
    {
      "id": "eng-intake-013",
      "node": "throttleBodyAdapterBank1",
      "label": "Throttle Valve Adapter / Flange",
      "assembly": "Throttle Bodies",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Bolted adapter coupling the central throttle valve to the distribution pipe inlet, providing a gas-tight transition.",
      "parent": "eng-intake-005"
    },
    {
      "id": "eng-intake-015",
      "node": "resonanceFlapVacuumUnit",
      "label": "Flap Vacuum Diaphragm Cell (MD)",
      "assembly": "Intake Manifolds",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Vacuum-controlled diaphragm cell that drives the tuning flap, activated map-controlled by the DME via the electropneumatic switching valve on the resonance tube.",
      "parent": "eng-intake-008"
    },
    {
      "id": "eng-intake-016",
      "node": "mapSensorBoostPressure",
      "label": "Manifold Pressure Sensor",
      "assembly": "Sensors",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Measures absolute pressure in the intake distribution system so the DME can verify load detection alongside the MAF-7 signal.",
      "componentId": null
    },
    {
      "id": "eng-intake-017",
      "node": "intakeManifoldPressureSensor",
      "label": "Intake Manifold Pressure Sensor (Absolute)",
      "assembly": "Sensors",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Secondary manifold-absolute-pressure tap on the distribution pipe; supports load-detection redundancy for the DME.",
      "parent": "eng-intake-016"
    },
    {
      "id": "eng-intake-018",
      "node": "intakeManifoldTempSensor",
      "label": "Intake Manifold Temperature Sensor (Charge Air)",
      "assembly": "Sensors",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Monitors air temperature downstream of the throttle valve; input to DME charge-temperature compensation.",
      "parent": "eng-intake-009"
    },
    {
      "id": "eng-intake-019",
      "node": "crankvcaseCvLineSecondary",
      "label": "Crankcase Ventilation Secondary Line",
      "assembly": "Crankcase Ventilation",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Secondary hose routing crankcase gases to the pre-filter side of the driver-side air cleaner, completing the closed-loop ventilation circuit.",
      "parent": "eng-intake-010"
    },
    {
      "id": "air-intake-new-001",
      "node": "airFilterElement",
      "label": "Air Filter Element (Panel Type)",
      "assembly": "Airbox & Filter",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Replaceable panel filter insert inside the air cleaner housing that traps dust and debris. Change interval per the market-specific maintenance schedule.",
      "componentId": "airfilter",
      "parent": "eng-intake-001"
    },
    {
      "id": "air-intake-new-002",
      "node": "airGuide",
      "label": "Air Guide / Deflector",
      "assembly": "Airbox & Filter",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Directs airflow at the driver-side quarter-panel opening toward the intake duct to ensure a steady supply of cool ambient air.",
      "componentId": "airfilter",
      "parent": "eng-intake-001"
    },
    {
      "id": "air-intake-new-003",
      "node": "oilSeparatorCrankcase",
      "label": "Oil Separator (Crankcase Ventilation)",
      "assembly": "Crankcase Ventilation",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Separates oil mist from crankcase blow-by gases before they are returned to the intake system, preventing oil contamination of the intake tract.",
      "componentId": null,
      "parent": "eng-intake-010"
    },
    {
      "id": "air-intake-new-004",
      "node": "intakeManifoldRubberSleeve",
      "label": "Throttle-to-Distribution-Pipe Rubber Sleeve",
      "assembly": "Intake Manifolds",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Flexible rubber coupling between the central throttle valve and the distribution pipe that absorbs vibration and seals the air path.",
      "componentId": null
    },
    {
      "id": "air-intake-new-005",
      "node": "intakeManifoldSeal",
      "label": "Intake Manifold Seal",
      "assembly": "Intake Manifolds",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Seals the mating face between the intake manifolds and the cylinder heads to prevent unmetered air ingress.",
      "componentId": null
    },
    {
      "id": "air-intake-new-006",
      "node": "airboxMountingGrommet",
      "label": "Air Cleaner Mounting Grommet / Rubber Buffer",
      "assembly": "Airbox & Filter",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Anti-vibration rubber grommets isolating the air cleaner housing from the engine-bay structure to suppress noise transmission and protect the housing from stress cracking.",
      "componentId": "airfilter",
      "parent": "eng-intake-001"
    },
    {
      "id": "air-intake-new-007",
      "node": "ramAirSnorkelDuct",
      "label": "Side Scoop Snorkel (driver-side rear quarter)",
      "assembly": "Airbox & Filter",
      "system": "Engine",
      "tier": "primary",
      "partNumber": null,
      "function": "Inlet snorkel at the driver-side rear-quarter scoop drawing ambient air into the intake duct — the 987 breathes through one side scoop only.",
      "componentId": "airfilter"
    },
    {
      "id": "air-intake-new-008",
      "node": "mafSensorHousing",
      "label": "MAF Sensor Housing / Measurement Tube",
      "assembly": "Sensors",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Precision-bore connecting piece that cradles the hot-film MAF-7 sensing element between the air cleaner outlet and the intake tube, ensuring laminar flow past the sensor.",
      "componentId": null,
      "parent": "eng-intake-004"
    },
    {
      "id": "air-987-new-002",
      "node": "helmholtzResonator",
      "label": "Helmholtz Resonator (air cleaner output)",
      "assembly": "Airbox & Filter",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Acoustic resonator on the air cleaner output. For 2009 (987.2) the size and position of its opening were modified on Boxster models to improve intake noise with the top down.",
      "componentId": "airfilter",
      "parent": "eng-intake-001"
    },
    {
      "id": "air-987-new-003",
      "node": "distributionPipeFlap",
      "label": "Distribution Pipe Flap (Switching Flap)",
      "assembly": "Intake Manifolds",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Half-oval switching flap in the twin-flow distribution pipe. Closed in the lower rev range so the flat six behaves like two 3-cylinder engines in parallel; on the 3.4-liter DFI it opens above ~3,800 rpm.",
      "componentId": null,
      "parent": "air-987-new-001"
    },
    {
      "id": "air-987-new-004",
      "node": "tuningFlap",
      "label": "Tuning Flap",
      "assembly": "Intake Manifolds",
      "system": "Engine",
      "tier": "sub",
      "partNumber": null,
      "function": "Switchable tuning flap in the resonance tube that adapts the air-column oscillations to engine speed for a fuller torque curve; on the 3.4-liter DFI it opens above ~5,300 rpm.",
      "componentId": null,
      "parent": "air-987-new-001"
    }
  ]
}