Originally Posted by Mred
Thanks again... is this torque curve you refer to?
Data in that graph doesn’t look correct to me. I tried to find curves directly from Mercedes but OEMs are starting to keep this type of info close to their vest.
You shouldn't directly compare engine performance at different speeds between engines of different displacement per cylinder. Physics being what they are, larger cylinders “normally” perform similarly at slower speeds, while smaller engines typically spin faster. In engineering school we compared engines more directly by measuring engine speed in piston speed. A larger engine with a stroke twice as long usually spins about twice as slow. I’ve had large diesels that redline at 1800 RPM. Very large engines may only go to a few 100 RPMs.
Just saying that you should take advice in right context. Your 3.0L V6 can spin to 4,000 RPM, while others can’t even come close to that. It also pays to know the difference between torque and power. They are often used interchangeably but shouldn’t be. And this is key in your question because you’re talking about different transmission gears and engine speeds.