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Isn't their partnership meant to be an exclusive deal though? I quite like how they're the only works team with this arrangement but if Honda becoming a supplier for x teams means they make big improvements, that would be good as well. How much of McHonda's problems are down to McLaren's size zero design affecting the engine etc? I don't really know how much the whole package differs to what other teams are doing though.
I do think they will get there eventually. Honda have done this before, they can clearly build winning engines but the last two seasons have been a case of R&D in the public gaze.
Well_is_it-
It is exclusive and that is what Ron Dennis fought hard to protect. But this went against Honda's benefit, as they could have ramped up their development so much faster if even Manor and Haas had used Honda units. As for size zero design, I'm not that te chnical enough to answer that, and maybe @gridds might be the better person to field that one.
GA2G
If Honda can change their contract with McLaren, so as to let other teams use their engines, they will increase their development hugely. I think Honda are not so far away from a break through. Red Bull are really looking strong though, despite being underpowered.