Interesting graphs about brake specific fuel consumption

[LTC8K6]

I've been lugging the shit out of a lawn mower for the past 10 years and the thing still works.

If I turn it on then push it really fast into deep grass, it stalls 😀

So does a car... 😀

 

[GoSharks]

They are racing, and expect to be 'broken' by the end of the stage.

....

What does racing have to do with anything? Have any of you actually done a sustained climb on a bike? There is absolutely no way you are keeping constant RPM.

Take a look at this video: http://www.youtube.com/watch?v=mTd6CDQQfng
In the first part, they are obviously not going at race pace and yet you still see a combination of sitting and standing used.

 

[JCH13]

....

What does racing have to do with anything? Have any of you actually done a sustained climb on a bike? There is absolutely no way you are keeping constant RPM.

Unless you know how to pace yourself.

 

[QuantumPion]

No one in their right mind would do that for efficiency...

Note the painfully slow top gear acceleration times...

http://www.caranddriver.com/var/ezf...lication/201aa30d5cedebdd74e62c1d516c5ccf.pdf

Note the Si's painfully slow time compared to a trans that downshifts.

http://www.caranddriver.com/var/ezf...lication/bd4d43038b75633f2478539a08677c61.pdf

That's because the SI has a much lower 6th gear, not a apples-to-apples comparison there.

 

[GoSharks]

Unless you know how to pace yourself.

Why do you assume that constant RPM is the proper way to pace a climb? It isn't. By switching between sitting and standing, you also switch between slightly different muscle groups and cardiovascular requirements and gives a slight reprise for one "group" while still progressing on the climb.

Also, it is commonly accepted that climbing rpm will be slower than flat ground rpm. I tend to run ~10% less RPM on hills than flats (unless I run out of gears).
See:
http://www.bikeforums.net/archive/index.php/t-25392.html
http://www.bikeforums.net/archive/index.php/t-288172.html
etc

How does that relate to engines? It doesn't.

 

[Demo24]

Why are we arguing about biking methods? The simple analogy is this, you can't always maintain high gear on a bike, you can't always do that in a car. Both will 'bog' if you attempt to exceed this. Bikers case, they come to a stop. Engines case, it stalls comes to a stop. /analogy, stop trying to make it more than it is.

 

[LTC8K6]

That's because the SI has a much lower 6th gear, not a apples-to-apples comparison there.

No comparison was being made.

 

[JCH13]

Why do you assume that constant RPM is the proper way to pace a climb?

I didn't assume it was the proper way to pace a climb. Why did you assume that I assumed that? :awe: