Showing specs for all NA & NB Miatas

Valve spring out-of-square (Mazdaspeed)

Valve spring out-of-square (mm {in}) BP with TC IN 1.58 {0.062} max. EX 1.63 {0.064} max.Valve spring out-of-square (mm {in}) BP with TC IN 1.58 {0.062} max. EX 1.63 {0.064} max.

Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Turbo intake spring limit differs from the BP column (1.63 mm); use the BP with TC intake column.

Applies to
  • NB 2004–2005 (BP-Z3-TURBO) — 2004 factory turbo-engine evidence; 2005 inferred within MSM family.
  • Verified in: 2004 Mazda Engine Workshop Manual BP (1.8L), normally aspirated and turbo

Sources (1)

View 1 source citations
  • 2004 Mazda Engine Workshop Manual BP (1.8L), normally aspirated and turboTier 1
    Page 01–10–20 (PDF p. 32) · Printed value & notes
    Part no. 9999-95-EWBP-04
    Page 01–10–20 (PDF p. 32)
    Printed: “Valve spring out-of-square (mm {in}) BP with TC IN 1.58 {0.062} max. EX 1.63 {0.064} max.”