Just over 18 months ago, I wrote a long analysis of what I believed at the time was the main problem with Ducati’s Desmosedici MotoGP machine. In that analysis, I attributed most of the problems with the Desmosedici to the chosen angle of the V, the angle between the front and rear cylinder banks.

By sticking with the 90° V, I argued, Ducati were creating problems with packaging and mass centralization, which made it almost impossible to get the balance of the Desmosedici right. The engine was taking up too much space, and limiting their ability to adjust the weight balance by moving the engine around.

Though there was a certain logic to my analysis, it appears that the engine angle was not the problem. Yesterday, in their biweekly print edition, the Spanish magazine Solo Moto published an article by Neil Spalding, who had finally obtained photographic evidence that the Honda RC213V uses a 90° V, the same engine angle employed by the Ducati Desmosedici. Given the clear success of the Honda RC213V, there can no longer be any doubt that using a 90° V is no impediment to building a competitive MotoGP machine.

The photographic proof comes as confirmation of rumors which had been doing the rounds in the MotoGP paddock throughout the second half of the 2012 season. Several people suggested that the Honda may use a 90° angle, including Ducati team manager Vitto Guareschi, speaking to GPOne.com back in November.

I had personally been lucky enough to catch a glimpse of a naked RC213V engine at one rain-soaked race track in September, but while the glimpse through the window may have been good enough to form the impression of an engine that looked like it may have been a 90°V, it was a very long way from being anything resembling conclusive, and nowhere near enough to base a news story on.

Spalding’s persistence has paid off, however. The British photographer and journalist is a common sight wandering among the garages, either first thing in the morning, as the bikes are being warmed up, or late at night, while the mechanics prepare the machines for the following day.

At some point, the Honda mechanics and engineers – protective to the point of prudishness of displaying any part of their machine to the outside world – would let their guard slip. When they did, Spalding pounced.

So why did Honda elect to use an engine layout which is blamed for causing Ducati so much trouble? And how does Honda make the layout work where Ducati have continued to fail? The first question is relatively simple to answer; the second is a good deal more tricky.