Valve Spring Comparison

   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:

 

"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

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