180 Degree Exhaust Headers

[George_San_Jose1]

You folks are going over my head. I’m going to have to study what’s you’ve said here.

@B.L.E

Actually. a flat crank V-8 fires every 90 degrees, it just has a different firing order than a crossplane crank V-8. In order to fire two cylinders together every 180 degrees, four cylinders would have to come to top dead center at the same time, two of them firing and two of them reloading. With a 90 degree V angle of the cylinders, when either the two middle pistons or the two outer pistons of the left bank are at TDC, all the pistons on the right bank are at mid stroke.

I think I understand this part. Let me re-state it. With a flat-plane crank v8, if you looked at each bank, when two cylinders were up, the other two would be down, just like an inline 4. But when the cylinders in the first bank were either up or down, the cylinders in the other bank would be neither up nor down, but halfway in between, 2 half way on the upstroke, and 2 half way on the down stroke. Is that sort of correct?