Tomei Powered SOLID PIVOTS User Manual
Page 8
（4） Calculating Camshaft Clearance
The cam clearance measured, will be a difference figure than that of the reference level.
Cam Clearance Reference Level (When Cold)
・Intake 0.12±0.01 ・Exhaust 0.14±0.01
When difference of reference level is positive = Use thicker shims
When the difference of reference level is negative = Use thinner shims
Adjusting the cam clearance set point is done by using the correct shim thickness. Make your adjustments by calculating
the correct level ratio of the rocker arm ( consistent @ 1.7).
①Calculating the correct shim thickness
※The round off the adjustment value to the 3rd decimal point when calculating.
※When measuring with the test shim, use the 2.6 thickness shim.
②Selecting the shims for installation
Use the shim sizes that are the closest value to your calculations.
(EXAMPLE) When the calculated shim thickness is 2.64mm
When the shim thickness required is thinner than 2.60mm for the solid pivot side (Ref to the drawing B on the front
page), then additional machining will be required. Then you'll need to check the clearance values again when setting the
shim to verify the correct clearance. Please consult with us if you require this additional seperate tuning service.
When the above mentioned custom modification is required, depending on the cylinder heads condition,
in some rare occasions, there are cases when the correct value cannot be met. In these cases,
modifications to the head may be required.
Shims for installation are sold seperately.
Please check the correct shim sizes required prior to ordering via the calculation method as stated above.
(The chart is listed on the following page)
2.96
2.98
2.88
2.90
2.92
2.94
2.82
2.84
2.86
2.76
3.16
2.78
3.18
2.80
3.20
2.70
3.10
2.72
3.12
2.74
3.14
2.64
3.04
2.66
3.06
2.68
3.08
2.60
3.00
2.62
3.02
Measurement
Taken
－
＝
Cam Cl earance
Test Shi m t=2. 600
×
＝
+
＝
2. 60
2. 62
2. 64
2. 66
2. 68
Shim Sizes
Reference
Level
Difference of
Reference Level
Difference of
reference level
Constant 1.7
Adjustment
value
Measuring Shim
Thickness
Adjustment
Value
Shim thickness