{
  "baseline_commit": "44b5e9eb",
  "schema": "air-compensator-reference-v1",
  "owner_dimensions_applied": false,
  "classification": "factory_role_owner_context_and_cross_application_part_family_comparison",
  "factory_source": "https://www.spridgets.de/downloads/Parts-1977.pdf#page=122",
  "comparison_source": "https://www.v8register.net/FilesV8WN/210107-adjusting-opening-temperature-on-an-MGBGTV8-claw.pdf",
  "comparison_scope": "MG Car Club photographed BHH1163/CAM2864 family on MGBGTV8; component architecture only. No dimensions, fitted identity, adjustment or installation transferred.",
  "owner_photos": [
    "IMG_6885",
    "IMG_6886",
    "IMG_7034",
    "IMG_7035"
  ],
  "held_cleaner_neck_axis": [
    0,
    0,
    1
  ],
  "held_cleaner_neck_mouth_mm": [
    -300.0,
    50.0,
    -247.0
  ],
  "held_cleaner_neck_outside_bore_radii_mm": [
    24,
    20
  ],
  "estimated_circular_air_mouth_center_mm": [
    -300.0,
    84.5,
    -321.0
  ],
  "estimated_circular_air_mouth_normal": [
    0,
    1,
    0
  ],
  "estimated_air_mouth_radius_mm": 32.5,
  "estimated_unassigned_duct_mouth_mm": [
    -300.0,
    -10.0,
    -321.0
  ],
  "estimated_unassigned_duct_axis": [
    0,
    -1,
    0
  ],
  "estimated_duct_outside_bore_radii_mm": [
    24,
    20
  ],
  "estimated_cup_outside_radius_mm": 34,
  "estimated_cup_y_span_mm": 68,
  "estimated_projected_wall_mm": 1.5,
  "estimated_static_plate_thickness_mm": 1.2,
  "plate_comparison_only": true,
  "thermal_motion_reconstructed": false,
  "remote_preheater_connection_reconstructed": false,
  "limits": "Factory Parts-1977 plate122 lists BHH1163 air-temperature compensator, CHA379 cleaner connection and Federal CHA491 preheater connection. Owner IMG6885/6886/7034/7035 support the visible chamber/sleeve context, not hidden ports, dimensions or identity. The MG Car Club photograph is a same-part-family comparison in an MGBGTV8 context, not this fitted unit or a Midget service procedure. New rounded cup, circular ambient-air opening, perpendicular open duct neck, rim, walls and static plate/bracket are estimated reference geometry. The old cleaner-side neck axis, mouth station,24/20mm outer/bore radii and surrounding source poses stay. The hot-air branch stops at an unassigned mouth; no preheater hose, shroud presence or fitted Federal/California configuration is inferred. The plate/bracket and two rivet envelopes are an optional recognition comparison at an arbitrary fixed pose. Bimetal construction, hinge/mount details, fitted plate state, thermal movement, switching temperature, sealing, vacuum behavior, air mixing, loaded fit and removal path remain unverified. No MGB adjustment instruction, duct dimension or installation is applied to the Midget.",
  "factory_workshop_source": "https://www.spridgets.de/downloads/Midget%201500%20WH%20Teil%203.pdf#page=17",
  "factory_operation": "17.30.02, printed105,1975\u20131976 emission control",
  "documented_check": "Factory check distinguishes a cold plate at the ambient intake from a warmed plate moving toward the hot-air hose. The fixed reference plate is not assigned either state; no thermal motion or switching temperature is simulated.",
  "source_reading": "Factory Parts-1977 p122 visually read; AKM4071/B Teil3 scan17/printed105 visually read. MG Car Club comparison p1 visually read. Missing USA manifold/exhaust pages remain missing; no additional full-manual access claimed."
}