Quote:
Originally Posted by F104
sure, 40 years ago.. Today BMW test engines in a test cell, no transmission attached. To cut down on test time, each engine will be tested in a known cold state, that is cold engine to start with, warm fluids going in, and a 1-2 minute test max. It ain't redlined, is is tested to achieve a certain level. By testing each engine exactly the same way you can predict future (post run in) performance at normal operating temperature.
There's three stages in engine testing:
- "cold" = sounds like bad, but you start with well known conditions which change predictable during a short test. If you get X% performance the engine is good. These are checked against durability test with one per hundred, or per thousand.
- "warm up" = a state where you really don't know where each fluid/component is temperature wise, and not reliable for testing
- "warmed up" = Nice to have but too costly
|
All freshly built engines need to be red lined after being built, warmed up, then taken to red line.
Don't see why BMW would be any different.
Perhaps you're describing something different like, there is the actual break in of a freshly built engine, and then there is a test performed on certain engines.
After being freshly built they have a system to set the engine into for cooling and such, true no trans hook up but doesn't need that.
Fill with break in oil, fire up, warm up, taken up slowly to max engine speed.
Break in oil drained, fresh factory oil filled, move along.
The "break in" for the rest of the car will happen during the first few hundred miles driven by the owner.
Some of those parts are brakes, tires, clutch in MT, differential, etc...