Maintenance & Technical > KX500 Original
Exhaust pipe tuning
KXcam22:
Hangtime,
I just put a gnarly on my bike so I recall the differences (somewhat). The gnarly gets fatter sooner and is a lot fatter than the stock pipe (that's not very scientific is it). The overall length is about the same and going from memory the stinger on the gnarly might be longer. I'm going riding this morning so I will take a few comparison pics of the gnarly (unfortunately it's on the bike) and post in my gallery. The lengths and angles have a lot to do with things like overrev and where the focus of power is. I don't recall exactly which does what. I'll have to dig out my Jennings book and refresh my memory. Also keep in mind that the occaisional custom "dent" added to clear frame rails etc doesn't rob too much power and can sometimes simplify things lots. Cool project. Cam.
Polar-Bus:
--- Quote from: kx5tsi on September 23, 2006, 03:53:59 PM ---my experience with tuned pipes is limited to rc cars, but at least with the small 2 cycles, the longer the head pipe the more top end you get. But the actual pipe design is more important. The performance of a pipe is more depending on how quickly it goes from the head pipe diameter to the largest diameter of the chamber. The quicker it opens up to the chamber, the more low end, and vice versa. Lets say it opens up at a 45 degree angle, you are going to have a much more low end punch than one that opens up at a 30 degree angle, but the 30 will have more top end. Not saying its fact, but its just my two cents.
kyle
--- End quote ---
The behavior of a tuned exhaust is no different in a nitro engine, KX500, snowmobile, etc. Generally speaking the more "gradual" the taper in the divigerant cone, the more top end, and higher RPM's. The more abrupt, and larger in diameter the cone, the more bottom end.
bellracing2:
Thats why all the old school guys always said "fat is where it's at " when talking about pipes .
doordie:
And then we have to calculate: :wink:
1.Exhaust portimes.
2.Extra pipe volume/length,when KIPS is closed.
3.Temp(thinner or thicker material)
4.Application(MX/Motard/Enduro/Desert)
A pipe isn?t just a pipe,Lol :-D
hangtime:
Thanks for all of the input... The cone on the CR pipe definitely gets bigger quicker, so I'm assuming the low end (which I prefer) would benefit. If when this is up and running, and the pipe is just not usable. I'll have to find someone to make a custom cone pipe.
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