30-05-2013, 09:02 AM
If I've understood correctly, the XUD puts more 'instant' pressure on the piston (and rod) than the HDi. The Hdi reduces knock by having pre-injections and the knock sensor will also stop it knocking badly...with the XUD its just up to the person changing the fuelling. And surely pre-igniting puts massive strain on the rod as its still being pushed up by the crank as the explosion is trying to push it back down again.
Does that make sense? Just thinking that might be why HDi's don't seem to break rods even at the same sort of power increase?
If I'm completely wrong then fair enough lol.
Does that make sense? Just thinking that might be why HDi's don't seem to break rods even at the same sort of power increase?
If I'm completely wrong then fair enough lol.