GRR just dented my header! should i be concerned? - Wrist Twisters
 
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post #1 of 14 Old 10-08-2009, 06:43 PM Thread Starter
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GRR just dented my header! should i be concerned?

Ya i went up my friends driveway i thought i had nuf angle to get up as i had done many times before to get up his gutter and lip of concrete, but i didnt, ended up making a flat spot in the small bulged section of the header where it goes from 4 down to 2 at the bottom.

Should i be concerned? The dent is like 3in long 3/4 in wide and it got pushed in a max of 3/16ths of an inch... probably more like 1/8. The reason im concerned is i thought i read somewhere that there is catalytic converter material there, and getting pushed up like that would definitely restrict flow a ton, but i thought there was just one cat in the single section where the big bulge is?
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post #2 of 14 Old 10-08-2009, 06:53 PM
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Naah.. Let her fly and send your friend a bill.

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post #3 of 14 Old 10-08-2009, 08:27 PM
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Quote:
Originally Posted by nd4spdbh View Post
Ya i went up my friends driveway i thought i had nuf angle to get up as i had done many times before to get up his gutter and lip of concrete, but i didnt, ended up making a flat spot in the small bulged section of the header where it goes from 4 down to 2 at the bottom.

Should i be concerned? The dent is like 3in long 3/4 in wide and it got pushed in a max of 3/16ths of an inch... probably more like 1/8. The reason im concerned is i thought i read somewhere that there is catalytic converter material there, and getting pushed up like that would definitely restrict flow a ton, but i thought there was just one cat in the single section where the big bulge is?
There is no catalytic converter in there. It is actually in the bulge in the vertical section of pipe right before it Ys off to the cans (if you even have it at all). i don't know if this is fact or not, but supposedly the black Y pipe is cat free and the stainless Y pipe has a cat in it.

Someone on here recently rolled ball bearings through their headers and posted that they were clear end to end.

As for worrying, I don't think i would. But if you really want to replace/fix it, I'm sure somebody on here who has converted to the 900rr setup would be willing to sell their headers.

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post #4 of 14 Old 10-08-2009, 09:24 PM Thread Starter
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ok so long as there aint no cat in there im fine with it.

i know my california model has a cat and i can see it in the single section pipe that goes through the swing arm.

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post #5 of 14 Old 10-08-2009, 09:46 PM
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The cat is in the Y pipe. I knocked mine out with a long screwdriver and a hammer



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post #6 of 14 Old 10-09-2009, 06:29 AM
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i threw a cat once





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post #7 of 14 Old 10-10-2009, 02:43 AM
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Quote:
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i threw a cat once
I think ive eaten cat at my local chinese restaurant

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post #8 of 14 Old 10-10-2009, 08:13 AM
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I think ive eaten cat at my local chinese restaurant
I thought that was all they served?

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post #9 of 14 Old 10-11-2009, 07:42 AM
 
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Rock and Roll

I was pushing it hard along my local set of twisties up in the hills, and while committed through a corner I heard this very loud CLANG and felt the bike reverberate, but not through the steering or back end. I pulled over a few klick further on, and looked my scoot over, and in the same place as what nd4spdbh indicated I had picked up a dent, about 2" long and .5" thick. All I can say it would take one hell of a massive hit to dent a stainless tube like it was even if you used a hammer. There was also a coating of pulverised sandstone on the surface of the dent. I rode back to where it happened, but couldn't find anything. All I can think of was while I rode past a brick sized rock must have fallen from the cliff and rolled across the road, out of my sight, into the manifold, and then got knocked back off the road. If I had hit that rock with my wheels, I don't think I would have stayed on the bike as it would have smashed the front tyre and wheel. Weird shit can happen.

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post #10 of 14 Old 10-11-2009, 08:32 AM
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Quote:
Originally Posted by zookmor View Post
I thought that was all they served?
I don't know about where you are, but at least 75% of the Chinese restaurants around here are right next door to pet stores.

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post #11 of 14 Old 10-11-2009, 09:12 AM
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I always believed a little more power could be found if you cut that little bubble out and replace it, along with the restrictive smaller diameter section, with a nice free flowing straight piece of stainless steel tubing.



Man, that took some digging in the old old archieves find!
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post #12 of 14 Old 10-11-2009, 09:24 AM
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Exhausts, when I had my 919, I honestly lost track of how many different exhausts I tried.

Here is a comparison and some other stuff from the archieves.....

919 vs 900RR Stock Header Comparisons





And here I made a few measurements just because -



And the first old Kerker system I tried, plus a titanium 929 header I never did try but to this day it is mounted on the wall, I'm looking at it now.....

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post #13 of 14 Old 10-11-2009, 03:22 PM Thread Starter
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lol ya i took it for a good 100 mi ride all throughout the Santa Monica mtns yesterday... completely forgot about the dent, as i was winding through the awesomeness's called, decker canyon, latigo canyon, and kanan road :-)

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post #14 of 14 Old 10-11-2009, 03:34 PM
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Oh yeah, the dent, probably will not make any noticable difference.

Enjoy the ride!!!

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