Quote:
Originally Posted by bmwpower603
Quote:
Originally Posted by Scharbag
What fresh mumbo jumbo is this? 
Not sure where you got that info but you are dead wrong. Balance is only affected by material gain/loss or deformation. If that happens, you have big problems.
As for the tune - I do not know where to start...
:| |
Material loss is inevitable.
When it wears unevenly is when the problems occur. |
What material loss is inevitable? Babbitt? Pistons? Rings? Crank material?
Proper hydrodynamic bearings do not wear enough to even consider it wear. Plus, they "wear" evenly. Bad hydrodynamic bearings will spin before the mass difference matters.
Pistons will "wear" evenly over time. Unless an injector sticks open... but given the rings are tough, this usually scores the bore, so it will not really affect balance.
Rings wear. But unless something is very wrong mechanically, they wear evenly across all holes. Nothing you do the the ECU will affect this.
If you bend, deform or wear the crank, your engine is broken. Period. And nothing you do to the ECU can affect that.
The rotating assembly in reciprocating engines dates back to the 1800s. They had the balance thing sorted long ago. Nothing about the S65 is special. Other than the fact BMW screwed the pooch on the rod bearing nominal clearance and tolerance. Oh, and rod side clearance is too tight. And it gets terrible gas mileage because it makes you want to drive it hard just to hear it sing.
Please convince us otherwise, with some facts. That would be great.
Cheers,