Join Date: May 2014
Location: North Vancouver, BC, Canada
Most efficient RPM
So, here's my rather rambling question:
I did the front sprocket change, going down a tooth, which was a good decision based on the type of riding I do. However, I have some thoughts, and would enjoy hearing others thoughts.
First, I was a bit surprised by how much it increased RPM at any given road speed. I had read it would be an increase of 300 RPM, but seems more to me. But I don't take a very scientific approach to these things. Anyway, it seems like I'm spending more time running my motor around 4500 RPM. Before, I would run it closer to 4000, even less, and rarely got above 5000 before shifting. Now I'm regularly hitting 6000 before shifting. It certainly feels more sporty! And max HP is around 8k, is it not?
Now, I believe this motor makes peak torque at about 4500 RPM, so it would be good for the engine, and maximize "efficiency", to run it at that speed, no? Also, I've always believed a rule of thumb that one should keep the engine somewhere around the middle of the rev range for cruising, which for this engine just happens to be around 4500 RPM. So, all in all, it would seem to me that 4500 RPM would be the optimal engine speed, and that by changing my sprocket, in addition to better rideability for my conditions, I've also done my engine a favour by now keeping it in the optimal RPM range most of the time, whereas before, I was running it a bit below optimum. Does that make any sense??
I look forward to those brighter than I offering some analysis.
Every bike is an "adventure" bike because every ride can be an adventure!