Stonehauler
Well-Known Member
.....facepalm. Sorry, either you have no idea with respect to motors, or you are trolling. I will assume the formerDo rev limiters reduce performance or prevent destruction? Apple to apples would compare like limits. Only capable of spinning to 6500 rpm would raise the question how does the ev do when limited to the same? But different animal different capabilities same course?
Rev limiters prevent destruction of the various things involved.
Reciprocating engines (aka, piston type engines) take linear motion, and translate it into rotational motion. AKA, the piston moves up and down in the cylinder in the four-stroke pattern. Intake, compression, ignition/combustion/power, exhaust. that motion drives, and is driven by the crankshaft via the connecting rods. If that engine spins too fast, the forces on the connecting rod may cause it to shear, it may cause valve trains to float, resulting in valve contact with the piston and subsequent damage resulting from that contact. This means that large displacement engines must utilize expensive lightweight/high strength materials to allow for higher RPM limits.
In addition, the heat of the engine itself can result in significant heating of various elements like pistons. This means that if you have not correctly sized your pistons for the application you are using it for, you might end up seizing your motor. For instance, I can run my boat on WOT a heck of a lot longer than I can keep my car at WOT Again, RPM limits help.
Compare that with a Wankel (rotary) engine which can spin up to 10,000 RPM as it does not have all that mass that is just being pushed and pulled in a straight line. The main limiter on a Wankel is the speed of combustion. AKA, making sure you have enough time to inject, combust, and exhaust the system on each complete cycle.
Contrast that to an electric motor which relies on a spinning rotor that can be built VERY strong. The biggest limitations on motor speed will be the bearings and the internal forces on the rotor from being spun that fast.
So, "limiting the motor speed to 6,500 RPM" is just a really ignorant statement. It would be like saying "since an EV transmission only has one forward gear ratio, I am going to limit my 10s auto to 1st gear.
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