Ark said:The Mercedes engine did not turn the 09 Brawn into a winner, it merely helped it. The Brawn was already class of the field without the Mercedes engine. Likewise with Force India, their partnership with McLaren has aided them greatly, along with natural team progression.
You don't get anywhere quickly without taking risks. Ferrari played it safe over the winter building a reliable car, and look where they are now. Honda have had more than enough time to get their act together and produce a good engine, they have no need to 'prove themselves again' because the precedent is already there.
McLaren aren't yet in a position to build their own engines. They've already built a top-class standard car engine, but building an F1 engine is a whole different ball game, especially with the exhaust rules changing every other race at this point. Staying with Mercedes just wont let them be competitive enough in the constructors. They've had their exclusive partnership thing with Mercedes for many years now, and effectively, were the Mercedes representative in F1. Now that Mercedes has their own team, and are more concerned over their own efforts rather than that of McLaren, McLaren need to find an engine supplier (whether it be their own, or a third party) that will provide them with the advantages they need.
There's a red/white Malboro skin for the Williams F1 car in iRacing, and it doesn't look anywhere near as good as on the 80's & 90's cars.
There will be very little risk involved if MRL ever move engine suppliers. They wouldn't sign up for an engine deal anywhere else until the new supplier has extensively tested an engine on a dyno and will simply stay with MBHPE if the new engine is not as good.
McLaren's engine deal also includes KERS and they have a technical partnership until at least 2015 which involves a lot of dedicated testing work which I doubt they would get elsewhere.
If McLaren ever decide to build their own engine then they have a lot of work to do. Never mind the technical knowledge and personnel, at a very basic level, I doubt they have the space in their current building to house the whole infrastructure required for it.