Engine Valves & Valve Springs Specifications
WARNING: This page is about a different variant/trim than selected.
VALVES & VALVE SPRINGS
| Application | Specification | ||||||
|---|---|---|---|---|---|---|---|
| Valves | |||||||
| Face Angle | 45 Degrees | ||||||
| Installed Height | |||||||
| Normal | 1.772-1.791" (45.00-45.50 mm) | ||||||
| Serviceable | 1.795-1.831" (45.60-46.50 mm) | ||||||
| Minimum Head Margin | |||||||
| Intake | .035" (0.9 mm) | ||||||
| Exhaust | .039" (1.0 mm) | ||||||
| Refinish Length | |||||||
| Miata | |||||||
| Intake | |||||||
| Standard | 4.016" (102.01 mm) | ||||||
| Minimum | 3.952" (100.39 mm) | ||||||
| Exhaust | |||||||
| Standard | 4.016" (102.01 mm) | ||||||
| Minimum | 3.956" (100.49 mm) | ||||||
| Protege | |||||||
| Intake | |||||||
| Standard | 4.0043-4.0279" (101.71-102.31 mm) | ||||||
| Minimum | 4.0004" (101.61 mm) | ||||||
| Exhaust | |||||||
| Standard | 4.0043-4.0279" (101.71-102.31 mm) | ||||||
| Minimum | 4.0004" (101.61 mm) | ||||||
| Stem Diameter | |||||||
| Intake | |||||||
| Standard | .2350-.2356" (5.970-5.985 mm) | ||||||
| Minimum | .2330" (5.920 mm) | ||||||
| Exhaust | |||||||
| Standard | .2348-.2354" (5.965-5.980 mm) | ||||||
| Minimum | .2329" (5.915 mm) | ||||||
| Valve Springs | |||||||
| Free Length | 1.821" (46.26 mm) | ||||||
| Maximum Out-Of-Square | .064" (1.63 mm) | ||||||
| Compressed Length (1) | |||||||
| Minimum | 1.55" (39.5 mm) | ||||||
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