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Old 11-25-2017, 02:58 AM   #131
Cogsy
 
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It's definitely not every 180 degrees. Using your numbering system, #1 at 0 (left bank, front cylinder), #3 at 180 *(left bank, rear), #4 at 270 (right bank, rear cylinder), #2 at 450 (right bank, front) - all as you suggest so far I think - then back to #1 270 degrees later at 720. This makes for the unusual 'beat' of a V4 (and the reason they sound so cool in my opinion).

I think where you made the mistake is assuming there's only 90 degrees of crank rotation between both banks. Going one way there is 90 degrees but going back the other there is 270 degrees because of the direction of crank spin.




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