I have one tech question about V10 engines. I saw in other source, old naturaly aspirated V10 engines(3.5L/3.0L) are made than two 5 cylinder engines on one crankshaft => two firing at the same time? It is true? For ideal 72° V10 i think.
What the F1 V10 firing order?
Inline 5 cylinder diagrams:



Drawing original F1 V10 crankshaft:

(Source picture http://www.constructorsf1.com/clanky/kl ... l-1090.htm)