# Cylinder bore diameter by piston size (Mazdaspeed)

Canonical URL: https://miatatorque.com/spec/cylinder-bore-diameter-msm/

Applicability: NB 2004–2005 (BP-Z3-TURBO) — 2004 factory turbo-engine evidence; 2005 inferred within MSM family.

Confidence: fsm

Cylinder bore
mm {in}
Size Diameter
Standard 83.000—83.019
{3.2678—3.2684}
0.25 {0.01} oversize 83.250—83.269
{3.2776—3.2783}
0.50 {0.02} oversize 83.500—83.519
{3.2874—3.2881}
Wear limit
0.15 mm {0.006 in}

Always confirm against your factory manual. Match every restriction and follow all stages and procedure notes. Disputed claims must not be automatically resolved. The complete record below preserves every printed unit, source claim and procedure.

```json
{
  "id": "cylinder-bore-diameter-msm",
  "name": "Cylinder bore diameter by piston size (Mazdaspeed)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        2004,
        2005
      ],
      "engines": [
        "BP-Z3-TURBO"
      ],
      "note": "2004 factory turbo-engine evidence; 2005 inferred within MSM family."
    }
  ],
  "kind": "non-torque",
  "value_text": "Cylinder bore\nmm {in}\nSize Diameter\nStandard 83.000—83.019\n{3.2678—3.2684}\n0.25 {0.01} oversize 83.250—83.269\n{3.2776—3.2783}\n0.50 {0.02} oversize 83.500—83.519\n{3.2874—3.2881}\nWear limit\n0.15 mm {0.006 in}",
  "procedure": {
    "notes": "Measure X and Y at 35 mm below the top surface. Base reboring on the actual oversize piston; all cylinders must have the same diameter. The 0.15 mm wear limit is additional wear, not an absolute bore diameter."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "workshop-bp-turbo-2004",
      "page": "01–10–22 (PDF p. 34)",
      "as_printed": "Cylinder bore\nmm {in}\nSize Diameter\nStandard 83.000—83.019\n{3.2678—3.2684}\n0.25 {0.01} oversize 83.250—83.269\n{3.2776—3.2783}\n0.50 {0.02} oversize 83.500—83.519\n{3.2874—3.2881}\nWear limit\n0.15 mm {0.006 in}",
      "verified_years": [
        2004,
        2004
      ],
      "document": {
        "id": "workshop-bp-turbo-2004",
        "tier": 1,
        "title": "2004 Mazda Engine Workshop Manual BP (1.8L), normally aspirated and turbo",
        "part_number": "9999-95-EWBP-04",
        "covers": [
          {
            "gen": "NB",
            "years": [
              2004,
              2004
            ],
            "engines": [
              "BP-Z3-TURBO"
            ],
            "trans": [
              "6MT"
            ]
          }
        ]
      }
    }
  ],
  "jobs": [],
  "system": "engine",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/cylinder-bore-diameter-msm/"
}
```