I degreed in my camshaft today. It is an old ATR 214/210 Billett Hydraulic Roller. Using the Rollmaster Timing Chain Set – certainly made changes rather easy.
The Cam Card defines Maximum Lift at 104* ATDC
I collected the following data:
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At 2A (2* Advanced) on the crank gear - I measured (91+124)/2 = 107.5* ---> 3.5* Retarded
At 4A (4* Advanced) on the crank gear – I measured (88 + 123)/2 = 105.5* ---> 1.5* Retarded
At 6A (6* Advanced) on the crank gear – I measured (49 + 158)/2 = 103.5* ---> 0.5* Advanced
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Last time I degreed in this camshaft back in ~ 2001 - I got pretty much the same numbers – well at 6A on the crank gear I measured 104* which is "dead nutts" (not retarded or advanced).
The timing chain set certainly corresponds to a 2* change per each tooth moved, yet I am curious why - if I was to install this assembly “straight-up” – it would be ~ 5.5* retarded?
The Cam Card defines Maximum Lift at 104* ATDC
I collected the following data:
--------------------------------------
At 2A (2* Advanced) on the crank gear - I measured (91+124)/2 = 107.5* ---> 3.5* Retarded
At 4A (4* Advanced) on the crank gear – I measured (88 + 123)/2 = 105.5* ---> 1.5* Retarded
At 6A (6* Advanced) on the crank gear – I measured (49 + 158)/2 = 103.5* ---> 0.5* Advanced
-------------------------------------
Last time I degreed in this camshaft back in ~ 2001 - I got pretty much the same numbers – well at 6A on the crank gear I measured 104* which is "dead nutts" (not retarded or advanced).
The timing chain set certainly corresponds to a 2* change per each tooth moved, yet I am curious why - if I was to install this assembly “straight-up” – it would be ~ 5.5* retarded?