125-200cc Will crimped pipe hurt performance

[Pedec]

Just notice pipe is crimped will this affect performance. It ktm 200sx pipe on wr165. Did not notice any loss of power before taking bike apart.

 

[Huskynoobee]

Nope that's just fine tuning. When you punch a hole or taco it, then you'll see a difference.

 

[troy deck]

THAT, PLEASE IF YOU DONT FEEL IT DONT SWEAT IT

 

[wallybean]

The header pipe is the most critical part of the pipe to keep uniform. That isn't a huge deformation but it is still costing you some performance. That will come out very easily by having someone blow it out. I fix simple issues like that all the time.

 

[Pedec]

How do you blow it out.

 

[duggoey]

I would think it would have an effect. The repair process is not that easy if you dont have the right equipment. Its a process of sealing the ends and pressurising with an air compressor, you then gently heat the damaged part with a torch. It isnt recommended if you havent done it before or without someone helping who knows how. Im sure there are plenty of shops who can help you out up there.

 

[wallybean]

Yes it is better to have someone experienced doing the blowing out. It will take them at most 30 minutes to do a complete job. First they have to burn out the existing spooge and carbon build up. Then they plug the ends and pressurize the pipe somewhere between 30-50 psi works well. Heat up the affect area with a torch to a cherry red and the internal pressure causes the pipe to retake its original shape. This is over simplified and it is really easy to ffup. Some shops will use an inert gas so they don't have to heat up and blue the entire pipe. It also eliminates the worry of a possible "explosion". There is a 2" diameter hole in the wall of the shop 20 feet from the vise I was using when I had this happen when I first started doing this. Stained shorts and a shortened life also happened. The plug you use in the exhaust port flange of the pipe is still down there between the walls somewhere. Steep learning curve. Now that I have done literally hundreds of pipes it seems easy and straight forward.

 

[R-J van Hulst]

not feeling any loss of power means that you don't ride to the max

I know a bit about fluids and pipes and a deformation like that on that place has a big impact on how the media flows.

Flows of fluids is not behaving much different then gasses (yet gases flow quicker (especially when they are hot))

the flow would be disturbed considerably and different wave patterns will form.

As the 2 stroke exhaust is one giant flute created to resonance in a bandwidth of rpm's the performance will be effected, yet it may be in a rpm range that you don't push your bike in.

Robert-Jan

 

[Pedec]

Looking like I need a new pipe.

 

[Huskynoobee]

Those pipes aren't that easy to replace. If you think it's a problem, get it fixed.

 

[Pedec]

Does anybody know somebody who can fix 2 stroke pipes in Canada.

 

[lankydoug]

Does anybody know somebody who can fix 2 stroke pipes in Canada.

https://www.piperepair.com/

They are close to Canada

 

[Zomby woof]

There are tons of people who do that in Canada. Ask some of your riding buddies. If one of them doesn't do it, I'm sure they'll know somebody

 

[2premo]

Yes it is better to have someone experienced doing the blowing out. It will take them at most 30 minutes to do a complete job. First they have to burn out the existing spooge and carbon build up. Then they plug the ends and pressurize the pipe somewhere between 30-50 psi works well. Heat up the affect area with a torch to a cherry red and the internal pressure causes the pipe to retake its original shape. This is over simplified and it is really easy to ffup. Some shops will use an inert gas so they don't have to heat up and blue the entire pipe. It also eliminates the worry of a possible "explosion". There is a 2" diameter hole in the wall of the shop 20 feet from the vise I was using when I had this happen when I first started doing this. Stained shorts and a shortened life also happened. The plug you use in the exhaust port flange of the pipe is still down there between the walls somewhere. Steep learning curve. Now that I have done literally hundreds of pipes it seems easy and straight forward.

wow without a blow off protection it can be hazardous

 

[everfree]

Just notice pipe is crimped will this affect performance. It ktm 200sx pipe on wr165. Did not notice any loss of power before taking bike apart.View attachment 64642

I watched this Motor Trend YouTube video where they bash header pipes and dyno the effects. I thought it would effect motor output more. Of course, it has 8 exhaust pipes vs. 1 pipe, but still interesting.

View: https://www.youtube.com/watch?v=azPKIjxmmdU

 

[troy deck]

MXA did a dent test on 2t pipes some dents actually showed an increase on the dyno the dents where huge before they got a power loss

 

[2premo]

pulse tuning is important
that said pulse tuning for a wide RPM range means many compromises exist
if you were tuning for one VERY specific RPM you would notice a tuning loss at that point
but the modern off-road bike we are talking about lugs and revs, so the tuning of the pipe was never spot on anywhere
mine will need to be fixed as it's bent enough to not fit correctly

 

[wallybean]

Here is a view from the vise and next to it is the hole through the particle board. I won't post pics of the shorts. Sometimes it is a wonder I have survived to this advanced age.

The header pipe on the 165 is particularly important with the 200 SX pipe. It is also an easy fix as the only real issue is keeping the plug below 400 degrees working that close to the spigot.

 

[shawbagga]

Nice shootin' Tex!!!

 

[Xcuvator]

I blew the inlet plug out on my first one and yeah it was exciting. I was nervous about it and didn't burn the spooge out first, so I wasn't anywhere close to the line of fire.

Light tapping on the crease with a body hammer (much like straightening a body panel) also helps me to make some repairs invisible on un-plated pipes..