# Compression pressure — maximum cylinder difference (NA6)

Canonical URL: https://miatatorque.com/spec/compression-pressure-cylinder-difference-limit-na6/

Applicability: NA 1990–1993 (B6) — Other years inferred from 1990 factory evidence.

Confidence: fsm

196 kPa (2.0 kg/cm², 28 psi)

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": "compression-pressure-cylinder-difference-limit-na6",
  "name": "Compression pressure — maximum cylinder difference (NA6)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1990,
        1993
      ],
      "engines": [
        "B6"
      ],
      "note": "Other years inferred from 1990 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "196 kPa (2.0 kg/cm², 28 psi)",
  "procedure": {
    "notes": "Warm engine to normal operating temperature; fully charged battery, all spark plugs removed, ignition-coil connector disconnected, accelerator fully depressed. Record maximum pressure while cranking; compare all cylinders at the specified 300 rpm."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1990",
      "page": "B–10 (PDF p. 37)",
      "as_printed": "196 kPa (2.0 kg/cm², 28 psi)",
      "verified_years": [
        1990,
        1990
      ],
      "document": {
        "id": "fsm-1990",
        "tier": 1,
        "title": "1990 Mazda MX-5 Miata Workshop Manual",
        "part_number": "1193-10-89C",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1990,
              1990
            ],
            "engines": [
              "B6"
            ]
          }
        ],
        "url": "https://archive.org/details/1990-mazda-mx-5-miata-workshop-manual_202411"
      }
    }
  ],
  "jobs": [],
  "system": "engine",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/compression-pressure-cylinder-difference-limit-na6/"
}
```