Stock Exhaust Tubing Specs - Wrist Twisters
 
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post #1 of 16 Old 10-29-2008, 12:57 PM Thread Starter
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Stock Exhaust Tubing Specs

Hi all.

Anyone out there know where to find the pipe specs for the stock exhaust system? I dont have a calliper, otherwise I would measure it myself.

If you care, here's why.

I found a picture on the Hornets nest where an Aussie used the stock headpipe, cut just past the back mounting bolt, and had a "midpipe" fabricated to mount to a side slip on mufler. The 4th post has a couple pics at this link. About the cleanest side exhaust I've seen. The purpose of knowing exhaust specs is to make it easier to plan this and find the appropriate stainless tubes.

http://www.hondahornet.co.uk/message...pic.php?t=8575

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post #2 of 16 Old 10-29-2008, 01:09 PM
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If you ever decide to add solo rear sets securing the can will be a problem. Other than that it is a clean looking installation.

Sorry I can't help with the pipe specs.

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post #3 of 16 Old 10-29-2008, 01:12 PM
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I like it, kind of cool how he mounted it to the exsisting passenger bracket.




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post #4 of 16 Old 10-29-2008, 01:20 PM
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CRR900 exhaust vs. Modified 919 exhaust

You be the judge. I like the modified 919 exhaust.

Modified 919 exhaust


CBR900 exhaust

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post #5 of 16 Old 10-29-2008, 02:04 PM
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I think the modded 919 header looks better. Mostly because the can isn't hanging so far out the back. I wonder if that crazy bend in the middle will affect it any? Probably not worse than stock, I guess, but not as free as the 900RR exhaust.

Just a thought. Can we have the best of both worlds? The short can and the tight headers?

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post #6 of 16 Old 10-29-2008, 02:55 PM Thread Starter
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I'm trying to get ahold of the guy that did it for measurements.

As far as short can: I think you could modify the new CBR 1000 aftermarkets that have the funny "s" turn midpipe, but its gonna cost you.

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post #7 of 16 Old 10-29-2008, 03:16 PM
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post #8 of 16 Old 10-29-2008, 03:41 PM
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Quote:
Originally Posted by Heath View Post
Hi all.

Anyone out there know where to find the pipe specs for the stock exhaust system? I dont have a calliper, otherwise I would measure it myself.
Outside diameters:
Head pipes -- 1.375" (35mm)
Outlet of first collectors -- 1.485" (just shy of 38mm)
Outlet of second collector -- 1.75" mean (44.5mm) This measurement is approximate as the entire length is a bend, and varies from 1.77" to 1.725".

If you are serious, the best route would be to cut off the rear bend as close to the collector as possible and weld a double bend in 1.75" O.D. on to it, or just a short straight piece to slip on to.

Rob

If it has already been done, it is safe to assume it is possible to do it.
On the other hand, if it has not been done never assume it is impossible to do it.
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post #9 of 16 Old 10-29-2008, 04:24 PM Thread Starter
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Thanks for the sizes. The one thing I like about that setup is that the one I saw keeps the rear header mounting bolt. Is your suggestion to cut it before that bolt? I ask as to clarification. Before I actually do this, I want to look at all angles and consider different ideas.

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post #10 of 16 Old 10-29-2008, 04:26 PM Thread Starter
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I also have noticed that if you could cut the header at the correct place, it would make bending a midpipe easier do to the angle, preventing having to work one of the 90 degree bends at a different angle in relation to the pipe.

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post #11 of 16 Old 10-29-2008, 04:36 PM
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Had to go back and look again -- the bracket for the rear mount welds to the rear collector, so it will still be there if the only cut is past that, on the outlet side of the collector.

The alloy Honda uses is not specified, but judging from the corrosion I'd say it's in the low 400 series, such as 410, 416/18, or 422F.

Rob

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On the other hand, if it has not been done never assume it is impossible to do it.
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post #12 of 16 Old 10-29-2008, 04:39 PM Thread Starter
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Will which type of metal make a big impact on whoever I can get to weld it?

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post #13 of 16 Old 10-29-2008, 05:00 PM
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Quote:
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Will which type of metal make a big impact on whoever I can get to weld it?
no.. as long it is a qualified tig welder he will know what to do...



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post #14 of 16 Old 10-30-2008, 05:17 AM
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That looks nice but it seems like a good bit of trouble when you could just buy a 900rr header. If you want it shorter you could modify the slipon like Barton did. Whatever floats your boat. Make sure you show us pics when you are done.

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post #15 of 16 Old 10-30-2008, 05:24 AM
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the blue is a damn fine touch if i may say so





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post #16 of 16 Old 10-30-2008, 11:38 AM
 
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i like mine

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