One of the constants is 'number of cylinders'. This value in my stock LB8 bin (HNL5360) is 192. The other LB8 bins I looked at had this same value as well. What does this mean (I expected the value would be 6)?

 

It is an interesting method of sepecifying the cylinder count. It is done this way to make it easier to use in the actual code. The cylinder count number is based on 256 being an 8 cylinder. In this manner the value of 0 is used as the 8 cylinder select value. Which also means that if you want to use a GM ECM on a 10 or 12 cylinder engine, the code will need to be modified.

Back to the 192: divide the number of cylinders by 8 and multiply it by 256. Or, just multiply the number of cylinders by 32 (256 / 8):

The result is the cylinder select value:

192 = 6 / 8 * 256 ; 6 cyl
160 = 5 / 8 * 256 ; 5 cyl
128 = 4 / 8 * 256 ; 4 cyl
96 = 3 / 8 * 256 ; 3 cyl

192 = 6 * 32 ; 6 cyl

RBob.

 

Excellent! Thanks RBob!