Originally Posted by grifo7
The effective cr calculator that techinspector mentioned is great! Worked for the Lunati cam figures that I have in the car at the moment. They are quoted at .050" - IO: 1 BTDC, IC: 37 ABDC, EO: 49 BBDC, EC: -3 ATDC.
BUT... the Comp Cams one (CB XM 284HR) I plan to install is quoted at .006" only. Figures are - IO: 32 BTDC, IC: 72 ABTD, EO: 79 BBDC, EC: 31 ATDC. These specs are for cam installed at 110 deg centreline. Duration at .050" is 230/236, advertised 284/290, LC is 112 deg.
Is there an approximate way to convert these figs to .050" ones, or do I have to contact Comp Cams themselves?