Firing order of the P & W 1830
Being part of a team restoring a C47 I asked our team leader what is the firing order of the R1830-92. He said "they" use the "minus 5, plus 9" method. Starting with cyl. number 1. 1 minus 5 = -4 (no minus 4 cyl.) therefore 1 + 9 = 10. Next 10 + 9 = 19 (no number 19 cyl.) therefore 10 - 5 = 5. Next 5 - 5 = 0 (no number 0 cyl) therefore 5 + 9 = 14 etc, etc, etc.