This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Power/torque

Dr_C

Dr_C

Joined Oct 2003
955 Posts | 1K+
Sweden
The latest news on my supermono-bike are new intake port spec and totally new exhaust system. This called, of course, for some dynoing. Comparing numbers is less relevant, but I´m curious about other examples on power band. My torque is useful from 5500rpm and drops off at 7000-7500rpm. The power peaks close to 8000rpm. What is normal for any tuned 650 out there? Stroke and bore is stock (2003-spec).

/Dr_C
 
Hello

I have on my 2004 650;

64-65SAE HP at 7800rpm
62-63Nm torqye at 6000Rpm


stock I had 58-59Hp and 59-60Nm torque

greetings Madero
 
That sounds reasonable, Madero. My results are with the #62-cam. What cam are you using?

/Dr_C
 
Hello


Oem cam 2004,I tought 266 degrees duration and 10,80lift.

I tried also the X2 but had less top HP,my max Hp output became faster about 7300-7400Rpm and was stronger in low rpm but a loss of 3Hp on top.So I changed back to my OEM cam.Maybe with an other exhaust I had other results but the test were done with my DOMA who is an exhaust for supermotard low-mid.

My other FP is otherwise low on low rpm and very strong on top rpm.

MAdero
 
Dr C

you can get free horsepower up to a certain point as you will know but after that you can only 'rock' the power curve to suit your wishes and most of all the stopwatch.

your torque figures are a lot higher in the revs than madero's so i would look there.

to increase peak BHP i would consider a hairier cam, larger valves, larger ID headers. if you both run the same valve sizes i would say it's in the cam.

which lineaweaver cam is it that offers more top end? it wouldn't necassarily be a win and lose situation. a hairy cam WITH all else being right will infact lose you nothing at the bottom and give you a healthy top end boost.

depends where you are in the line of evolution!

regards

Taffy
 
Hey Dr C,

I've uploaded a few charts into my gallery. Bog stock 03 650 with different exhausts and one chart of different camshaft with OEM mx exhaust system. I'm sure you already know these figures but it may be useful for comparisons.

Camshaft

FP

Doma

Akropovic

Any chance of some photos of your new exhaust system then, assuming it's as unusual as previous models?

BTW what kind of pump do you use for your hydro forming? I'm having difficulty finding a suitable one at the moment - they're either too little pressure capacity or complete overkill (and very expensive).

Cheers,
Simon
 
I´m very satisfied with a usable register between 5500 and 8000rpm. With usable register I mean somewhere over 50Nm. Together with my close ratio gearbox, the bike works very well. I think the engine suffers from "slipping" valves (or whatever it´s called in english), which restricts further revving. Power peaks at 75hp, close to 8k and torque peaks at 75Nm at 6-6,5k, if I remember correct.

The current exhaust design is more like the MotoGP-style, fairly large and very short. I have managed to place the silencer under the engine, ending just behind the left footrest. This design boosted low/midrange radically and I lost just a little power (2-3hp) after the peak at 8-8,5k. The largest torque-contribution came, without a question, from the intake length.

When manufacturing my exhaust pipes I have always used normal compressed air. 1-2 bars is sufficient when "helping" the forming with a torch. And it doesn´t go BANG, I promise!

/Dr_C
 
"Valve float"! That was the correct term. My 40mm intake valves were way too heavy at 71 grams. I have made them lighter now, ending at 57 grams. Together with the new, somewhat tougher springs, I hope to have cured the problem. I´m off this weekend for the season finals. Then we will see if it worked...

/Dr_C
 
Again, what are all the different methods of measuring HPs?

How is the Yamaha R6 supposed to get 110 BHP with 50ccs less than the 650 Husaberg?

It gets only 45 ft-lbs (61Nm) of torque stock, same figure as the 650 Husaberg stock, per Madero.

I would not expect the R6 to give more than 65 HP stock (probably up to 80 when prepped, but I really have no clue, I am just guesstimating about something I barely know).

Thanks for an answer, I'd like to learn something :)
 
Hey LeFrog,

In one very short three letter acronym :- RPM :)

BHP is a function of RPM and if you look at the R6 it is producing its peak power probably about 15-16,000rpm. Peak torque will be not far off that either!

Riding one of these on track is a really different world from the 650 - under 10k rpm there is simply nothing, get past and only then does it start to come alive....so when the R6 starts to live, the bergy is dead and buried (in the world of revolutions, that is).

Cheers,
Simon
 
What is the peak RPM for the 650?
 

Attachments

  • Si-Vision005.jpg
    Si-Vision005.jpg
    37.5 KB
  • Si-Vision004.jpg
    Si-Vision004.jpg
    31.6 KB
  • Si-Vision000.jpg
    Si-Vision000.jpg
    47.5 KB
LeFrog said:
What is the peak RPM for the 650?
Click to expand...
That kind of depends on how long you want it to last ;-)

You can get the 650 engine to rev up to around 10,000rpm but at that point piston speeds become such that it gets dodgy. The stock 650 at 644cc makes its power at about 7 - 7.5k and runs out of breath at 8 - 8.5k rpm.

Cheers,
Simon
 

Similar threads

R
New To Me FE390 Maintenance Insights
Replies
24
Views
4K
robinasu
R
M
maKe's 570 motard build (the $$$$ pit)
Replies
48
Views
30K
HusaBELGfs570
H
sqd8r
KTM SMC 625, 'Berg 640e, DRZ400SM
Replies
10
Views
2K
BrianSM
B

Register CTA

Register on Husaberg Forum! This sidebar will go away, and you will see fewer ads.

Recent Discussions

Recent Discussions