Shortened exhaust cans - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 12 (permalink) Old 05-19-2006, 10:37 AM Thread Starter
 
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Shortened exhaust cans

I took 1 1/4" off each can on my 06 ZX10r. Along with a definitely deeper exhaust note, it made a huge difference in the look of the bike! My only concern was loosing to much back pressure as I already have removed the butterfly valve in the exhaust, but actually seems like I gained throughout the rpm range. Seems to pull alot harder in the lower rpm's, gonna have to get on the dyno soon to confirm. Ill post a pic a little later of before and after.
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post #2 of 12 (permalink) Old 05-20-2006, 10:41 AM
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Yeah I want some pics.... I'm very interested in what it will look like...






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post #3 of 12 (permalink) Old 05-21-2006, 02:17 PM
 
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I have the same bike, my question is what is the butterfly valve?
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post #4 of 12 (permalink) Old 05-21-2006, 08:17 PM
 
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Quote:
Originally Posted by wgc_3
I have the same bike, my question is what is the butterfly valve?

the butterfly valve is located at the collector and its purpose is to keep up the low-end power....(maintaining backpressure at low rpms/ and it opens up in the upper rpm range)
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post #5 of 12 (permalink) Old 05-21-2006, 08:20 PM
 
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I have a friend with a 97 CBR F3 that cut his can into a shortie. He stunts that bike so it helped him out with that.
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post #6 of 12 (permalink) Old 05-22-2006, 12:04 PM
 
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Since, we are on the topic of the '06 ZX-10R, I have a question I have quite a large dent in the header will this really effect anything?

(I would upload a photo but everytime I try it doesnt uplaod?)
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post #7 of 12 (permalink) Old 05-25-2006, 04:19 PM Thread Starter
 
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Found a before and after dyno with butterfly valve taken out of a zx-10, same dyno, about 15 min apart on runs and this one did gain below 7000 rpm and stayed the same over. I will post pics of the exhaust after my kids wake up. Have a 2 1/2 yr old that gets very angry if she dont get to help wash the bike.
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post #8 of 12 (permalink) Old 05-25-2006, 04:27 PM
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What... the valve did what?




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post #9 of 12 (permalink) Old 05-25-2006, 05:45 PM
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Quote:
Originally Posted by Gas Man
Yeah I want some pics.... I'm very interested in what it will look like...

I've got an 03' 636 with a short can now. I'll get some pics up soon. I would think that with the short pipes and them being undertail that you might run into a plastic melting problem.

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post #10 of 12 (permalink) Old 05-25-2006, 07:17 PM
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I've seen them in person. It's a really clean job. They aren't short enough to melt plastic.

2006 Kawasaki ZX-10R
Tank Pad, StompGrips, Homemade Fender Eliminator Kit
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post #11 of 12 (permalink) Old 05-25-2006, 07:58 PM Thread Starter
 
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Quote:
Originally Posted by Gas Man
What... the valve did what?
The butterfly valve serves two purposes, 1. help with back pressure for better bottom end performance and 2. lower noise emissions in the lower rpm's. Visually watching the valve, it starts to open @ 6000 rpm and is full open just before 7000 rpm.
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post #12 of 12 (permalink) Old 05-25-2006, 08:07 PM
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Quote:
Originally Posted by mlkx3
The butterfly valve serves two purposes, 1. help with back pressure for better bottom end performance and 2. lower noise emissions in the lower rpm's. Visually watching the valve, it starts to open @ 6000 rpm and is full open just before 7000 rpm.
I know what they do but I was just confused by your statement... it just wasn't clear enough to get thru my dumb head....




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