MCN's screwed up somewhere again... (1000CC test)

[johnnyrod]

A mistake in MCN? No way! I'm mildly surprised they don't all make 1,000,000+BHP and corner on rails

[Gazza77]

Originally Posted by ThEGr33k

Right then... The MCN test our this weak, the 4 Jap bikes vs the BMW S1000RR.

The problem? Power, basically MCN have tested them on a Dyno (apparently) and the lines and numbers they have come out with are interesting to me, but not in the usual "wooo thats nice aint it" kind of way, its in the "how the hell can that work?" kind of way.

Right then, people might know that the Torque (ft-lb) and Power (BHP) are directly related and you can convert torque at a certain RPM to BHP at that same RPM simply by doing torque x RPM / 5252=bhp and bhp/rpm x 5252 = torque.

So from that you will know that if two completely different bikes have the same torque at the same RPM they will have the same power. and visa versa.

Now look at this picture:



What looks off to you? Well either the power line for the BMW is way off or the torque line is. Why? Well as above, if the BMW has a power line above the other bikes, its torque line should be also... is it? Nope. So, which one is wrong? Id guess power line, and that the torque is pretty much bang on. Which means that if the torque at 11,800rpm (where the power graph says peak power is) is about 72ft-lb (hard to tell with scale of graph) the power will be 75*11,800 / 5252 = 162BHP.

So what if the power line is right? Well 183 / 11800 x 5252 = 81.45 ft-lb at 11,800 RPM, now that is pretty unlikely imo, a Desmo RR Motogp replica dont even make that at that sort of RPM!

So what do you think? How on earth did this get past them at MCN (he he)?

cheers for reading.

You sound surprised by this.

Originally Posted by johnnyrod

A mistake in MCN? No way! I'm mildly surprised they don't all make 1,000,000+BHP and corner on rails

Oh, they do, they are the dogs danglies

until the next updated bikes come along, then this years superfantastic bikes become heavy, slow, cant hold a line, crap brakes, need revving at 20,000,000 rpm to be on par with the latest greatest

The graphs don't correlate with one another at all, it's not just the BMW. According to that, the R1 and CBR both continue to make close to peak power at 12k rpm even though the torque has dropped to nought by then.

It's like the two charts were made from two lots of very different dyno runs, or two seperate people guessed them. (Or one incredibly dumb person).

Actually I have noticed something else... A few of the bikes that in the power graph rev to 13000+rpm, yet on the Torque one they rev to under 12000rpm. ha ha. sigh.

No doubt we'll get the weekend warriors all going round on the BMW saying "mines got way more power", then pulling this report out...

Originally Posted by sinbad

The graphs don't correlate with one another at all, it's not just the BMW. According to that, the R1 and CBR both continue to make close to peak power at 12k rpm even though the torque has dropped to nought by then.

It's like the two charts were made from two lots of very different dyno runs, or two seperate people guessed them. (Or one incredibly dumb person).

Ah sorry didnt notice that you beat me to that.

Indeed, the graphs looks pretty screwed. I read the 2009 summery part of this weeks paper and it seems that there was someone who dyno'd a BMW and got this power output from it then MCN said he said it had 200bhp at the crank... like they can test that. Sigh. For all we know my old SV might have had 300bhp at the crank and lost 230bhp of it to the wheel

So yea, one big ball dropped

so perhaps we should send a link to this thread to the editor of MCN?

maybe he can get someone to explain whats gone wrong in the Mathematics and Statistics deparment at MCN Towers

"ah, yes, well, t'trouble you see was we forgot to carry t'one"

Originally Posted by Alpinestarhero

so perhaps we should send a link to this thread to the editor of MCN?

maybe he can get someone to explain whats gone wrong in the Mathematics and Statistics deparment at MCN Towers

"ah, yes, well, t'trouble you see was we forgot to carry t'one"

lol Hope that t' is not a hit at my accent

Originally Posted by ThEGr33k

lol Hope that t' is not a hit at my accent

na, its just my generic "number crunching" accent in my head its a nice soft irish accent

Originally Posted by Alpinestarhero

na, its just my generic "number crunching" accent in my head its a nice soft irish accent

Ahhh ok then