Valve Spring

Valve spring compression pressure
Intake (n @ spec. length) 680 N @ 30.19 mm (153 lbs. @ 1.18 in.)
Exhaust (n @ spec. length) 680 N @ 30.19 mm (153 lbs. @ 1.18 in.)
Valve spring free length (approximate)
Intake 46.8 mm (1.84 in.)
Exhaust 46.8 mm (1.84 in.)
Valve spring installed pressure (n @ spec. length)
Intake 228 N @ 39.99 mm (51 lbs. @ 1.57 in.)
Exhaust 228 N @ 39.99 mm (51 lbs. @ 1.57 in.)
Valve springs installed pressure (n @ spec. length -service limit) 10% Pressure loss @ 30.09
Valve springs-out of square limit 1%