7 replies to this topic

[jvl]

reports on the new renault v10 say that they are suffering from flexing problem.could anyone please explain the problem and principles behind it.

[Greg L]

From what I've read, the engine block is unusally weak (why, I don't know). Since the engine is a stressed member (the suspension and bodywork attach directly to the engine block), the pressures of the chassis are transferred to this weak engine block, which in turn bends or flexes. Apparently, the flexing has been so extreme in testing that pistons have seized in the cylinder, causing a quick and complete engine failure. Haven't heard anything about this in a while so maybe they fixed it . . .

[desmo]

The lid has been kept so tightly on the Renault engine thus far as far as security that I wouldn't take these reports too seriously. It is likely that the "leaks" are either pure speculation or perhaps even more likely deliberate misinformation initiated by Renault or sources close to the Regie that might seem credible to journalists intended to throw others off the trail.

The only other engine builder who keeps their engine so under wraps is Cosworth and it is notable that if car performance is any indication, ironically neither team may have much to hide.

[Halfwitt]

Originally posted by desmo
The only other engine builder who keeps their engine so under wraps is Cosworth and it is notable that if car performance is any indication, ironically neither team may have much to hide.

How could you suggest such a thing? Wash your mouth out immediately!

Cosworth had what amounted to a temporary advantage, where their radical new engine was obviously very quick. So, naturally, everybody wanted a look as it seemed to be a step in the right direction, much better than Cosworth's previous (recent) efforts, and a mathc for the best. Now though, it is a radical midfielder, and I think people would want a look more for the sake of curiosity, rather than going away to copy it.

[desmo]

Perhaps they are so secretive for the same reason that fat women don't wear bikinis!

[AndyM]

Cheers Desmo, what a lovely thought for 10.00 o'clock in the morning....

[carlos.maza]

A narrow-angled V10 (such as 72°) is more compact and rigid than a 111° V10. Obviously, you can make the second as rigid as the first, but with a weigth penalty.
As the engine is a stressed member, rigidity is of paramount importance.
Another factor to consider (seen in other threads) is vibrations.

What solution would be lighter: making a wide-angled V10 as rigid as a narrow-angled or using some kind of sub-chassis/sub-frame at the rear in order to relief the engine from structural loads?

[Ray Bell]

Originally posted by desmo
Perhaps they are so secretive for the same reason that fat women don't wear bikinis!

You've been looking around the nudist camps, eh?

Obviously this is a tradeoff with the wide angle engines... and they can no longer go the A6SSG (was that the one?) route and count on crank rigidity to stiffen up the block, either...