Your at least partly right.
For 18 Cyl./ double row Engines:
Front row cyl. are counted as 2 - 4 - 6 - 8- 10 - 12 -14 - 16 - 18
Back row are 1 - 3 - 5 - 7 - 9 - 11 - 13 - 15 - 17
The ignition occurs in following order: 1 - 12 - 5 - 16 - 9 - 2 -13 - 6 -17 - 10 - 3 - 14 - 7 - 18 - 11 - 4 - 15 - 8 then 1 again....
There is a formula for the difference between cyl numbers, for the 18 cyl engine its 18/2 +2= 11. 1+11= 12, 5 +11=16....
The angle is 360/9cyl= 40 degrees plus 180 degrees for the second crankshaft offset. (220 total)
Cyl 1 to Cyl 12 is 220 degr., then its another 220 to Nr.5, 220 deg to 16 etcetc.
For 14 Cyl / double row:
Its analog for a 14 cyl eng. 14/2 + 2 = 9, so firing order is 1 - 10 - 5 - 14 - 9 - 4 - 13 - 8 - 3 - 12 - 7 - 2 - 6
This is out of a German 1959 book, called modern aircraft engines...
Edited for being too stupid (14/18 cyl)
Last edited by His dudeness; 18th Nov 2008 at 10:33.