Cam degreeing. I totally don't understand.
New mild build 340. I think I understand the degreeing process. but from these cam specs what am I looking for at centerline. Doing what I've read, heard, watched. Off the #1 intake lifter I end up with 110. From these specs what number am I looking for?
264-264, 214-214 @50 lift int./ex 440 lobe separation 110. Centerlines int. 106, ex 114
If your intake center line is 110 for the intake, then the exhaust center line will be:
2*lobe sep - intake centerline = exhaust centerline
2*110 - 110 = 220 - 110 = 110 BTDC = exhaust centerline
For advertised duration:
intake centerline - intake duration/2 = intake open
110 - (264/2) = 110 - 132 = -22 = intake open
This means that your intake valve will open at
22 BTDC
Intake centerline + intake duration/2 = intake close
110 + (264/2) = 110 + 132 = 242 ATDC
now to get the relationship back to TDC, just subtract from 360
360 - 242 =
118° BTDC = intake close
exhaust centerline - duration/2 = exhaust close
110 - (264/2) = 110 - 132 =
22 ATDC = exhaust close
exhaust close - exhaust duration = exhaust open
22 - 264 = 242° from exhaust close
Now to get the relationship back to TDC, subtract it from 360
360 - 242 =
118° ATDC = exhaust open
for duration @.050"
intake centerline - intake duration/2 = intake open
110 - (214/2) = 110 - 107 = 3° = intake open
This means that your intake valve will open at
3° ATDC
Intake centerline + intake duration/2 = intake close
110 + (214/2) = 110 + 107 = 217 ATDC
now to get the relationship back to TDC, just subtract from 360
360 - 217 =
143° BTDC = intake close
exhaust centerline - duration/2 = exhaust close
110 - (214/2) = 110 - 107 =
3° BTDC = exhaust close
exhaust close + exhaust duration = exhaust open
214 - 3 = 211° from exhaust close
Now to get the relationship back to TDC, subtract it from 360
360 - 217 =
143° ATDC = exhaust open
* Info based on intake centerline of 110°