ENGINE
2.5
Total number of CCs to remove from the head = Old IHV -- Desired IHV
Removed CCs = IHV -- IHV2
Removed CCs = 1.299 cc
I=
Stroke
Displacement ô 2.54 ô
cm.
in
Number of inches to remove from the
cylinder head to equal 1 cc
I = 0.01186 ô
in
cc
To find out how much to cut off, multiply the number of CCs you need to remove
by the number of inches to remove per CC:
Thickness to remove = I ô Removed CCs
Thickness to remove = 0.015 in
Port open = 81.5q
This indicates the degrees after TDC that the exhaust port
opens (and also the degrees before TDC that the port
closes).
Duration closed = 2 ô Port open
Duration closed = 163q
Total duration = 360q
Duration open = Total duration -- Duration closed
Duration open = 197q
Percent open =
Duration open
Total duration
ô 100
Percent open = 54.722
PORT OPENING DURATION
HEAD CC REMOVAL EXAMPLE
Enfocus Software - Customer Support
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