| Stock Valve Closed Net Spring Pressure (lbs/inch) | Stock Valve Open Net Spring Pressure | Stock Valve Open Net Spring Pressure | |
| 1.575" | 0.414" valve lift | 0.460" valve lift | |
| Nissan | 74 | 164 | 174 |
| Schnieder | 101 | ? | ? |
| Crane with Crane Retainer | 101.7 | 191.2 | 201 |
Z and ZX Spring Specs:
Free length
Outer 1.968"
Inner 1.766"
Valve Closed compressed length and pressure
(Intake and Exhaust):
Outer 1.575" 46.96 lbs
Inner 1.378" 27.12 lbs
Net
74.08 lbs/in
Valve Open compressed length and pressure
(Intake and Exhaust):
Outer 1.161" 108.03 lbs
Inner 0.965" 56.22 lbs
Net
164.05 lbs/in
Spring Rate
Outer 147.51 lbs/in
Inner 70.46 lbs/in
Net 217.97 lbs/in
Crane Spring Specs:
Part Number: 99884-12
Outside diameter 1.304
Inside diameter 0.980
Seat pressure 90lbs @ 1.650"
Open pressure 230lbs @ 1.000"
Coil bind 0.927"
Rate 215 lbs/inch
Maximum net lift 0.650"
Crane Spring Retainer Specs
Steel
Part Number: 903-0105
Taper 7 DEG
Valve Stem Diameter 8MM
Spring O.D. 1.32"
Spring Type DUAL
Retainer Dimension A 1.245"
Retainer Dimension B 0.975"
Retainer Dimension C 0.75"
Height Comparison -0.035"
Note how lash pad sits (Stock on left Crane on
right)
Crane Retainer Note:
- The spring being less compressed by ~ 0.4mm when the crane retainer is used.
- Crane retainers are 31.368g compared to Nissan 23.444g retainers
- Stock Lash pads fit 1.4mm (0.055") deeper in Crane retainers
"Worn" Stock vs. Crane Springs
Stock on left
Outer Spring (Stock on left) 6.75 coils and 47.5mm
vs. 6 coils and 54mm
Inner Spring (Stock on left) 7.5 coils and 43mm
vs. 6.5 coils and 49mm