4-1 vs 4-2-1 - Kawasaki Forum :: KawasakiWorld.com
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post #1 of 24 Old 10-02-2001, 10:06 AM Thread Starter
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why are there different exhaust setups? what are the pros and cons of each exhaust set up? is it true that a 4-2-1 will give you better low-midrange power -vs- the peak power of a 4-1 setup? also will a high give less power than a standard pipe because of the curve? for example the standard yosh RS3 and the high yosh RS3? I know alot of ?'s but I need answers so that this winter I can install a new exhaust. And yes I know Akro is the best, by the way I realize that it is quite but can't you just take out some of the damping material in the canister before you install it, wont this make it louder?anyone done this?

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post #2 of 24 Old 10-03-2001, 03:36 AM Thread Starter
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32 views and no comments? could it be that I stumped the board?

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post #3 of 24 Old 10-03-2001, 03:50 AM
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I think so, I am not really sure.

I think I heard that a 4-2-1 has better low end response and a 4-1 has better high end response, but then again it may be reversed. LOL I am not sure.

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post #4 of 24 Old 10-03-2001, 04:03 AM
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I think the pipe for you would be a Muzzy. I believe Team Kawi uses the Akro cause they spend a lot of time up around the 9, 10, 11k range where they're looking at peak power. Muzzy pipes will turn out some impressive numbers and won't be that far behind the Akro up top. They will probably have better midrange numbers as well.

My opinion from some of the numbers I've seen would be pretty inline with what Easy said: 421 better midrange, 41 better peak.

As far as the pipes being loud, I just bought the Akro and the sound is awesome. It's more of a low rumbling noise at idle. And nice and loud under acceleration.

The Muzzy pipes are even louder, more of a raspy obnoxious loud which is what made me want to get one of those.

I don't regret getting the Akro, but I think you would like Muzzy pipes.

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post #5 of 24 Old 10-03-2001, 04:45 AM
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I have a Micron and a PC3r on my 2001 (4-2-1). My cousin has two 12's. One (2000) with a Akro (which he takes to the track alot) and one (2001) with a Muzzy, which he rides for fun. At my request he rides my bike to compare the performance with his two 12's. He says that he loves the Akro, and it's better than both the Muzzy and Micron. He also says that he gets more out of my Micron than his Muzzy. This comes from somebody that race his bike all the damn time. (One thing though.) He doesn't have a PC3 on either of his bikes.

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post #6 of 24 Old 10-03-2001, 04:59 AM Thread Starter
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I think I will be going with the Akro( I wish they had a larger selection of finishes available), Muzzy looks cheap(I realize it is a good pipe), I think that the only reason people even have them is because they were the first ones to provide an aftermarket pipe for the 12. I wish someone had a renegade dual high pipe system that would comment.

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post #7 of 24 Old 10-03-2001, 05:10 AM
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Akro..."simply the best"



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post #8 of 24 Old 10-03-2001, 05:23 AM
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those dual highs look cool but I personally don't think they'd perform that great. Your ass would get hot too with those pipes under there. If you get the Akro (I'm VERY happy with it) get it from Doug at SpencerCycle, you'll get the best deal BY FAR

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post #9 of 24 Old 10-03-2001, 09:08 PM Thread Starter
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yeah they do look really nice but 1200-1300 dollars? are they crazy? If I did get them it would be only for looks, and I'm sure they do have performance gain over stock. According to there dyno 10hp not bad. But then again you know they posted the best dyno run that they got so I wonder just how many times they had to dyno it to get a number that high.

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post #10 of 24 Old 10-04-2001, 02:43 AM
 
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4-1 pipes are used for DragRacing...More midrange

4-2-1 pipes are used for RoadRacing...More top end



This is what I was told...





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post #11 of 24 Old 10-04-2001, 07:36 AM Thread Starter
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Is is possible to make the akro louder, for example removing some of the dampining material? anyone done this or know the answer?

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post #12 of 24 Old 10-04-2001, 03:11 PM
 
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Sndnga, you need to go back and read earlier posts about Akro pipes. Doug at Spencer Cycle sells them for less than $950, including shipping. In fact he has special deals which include PC111R/K&N Filters/ Akro. You just can't beat his prices. Only a fool would pay $1,200 for one.

Check out the site spencercycle.com



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post #13 of 24 Old 10-04-2001, 03:16 PM
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That's about what I got mine for $944 with shipping to be exact. I originally wanted the Akro but I was going to settle for something else cause I wasn't going to pay $1200 for it. Then I found SpencerCycle and I'm so happy I held out for it! It sounds SOOOOO nice!!!! It rumbles at idle and is loud as hell when opened up

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post #14 of 24 Old 10-04-2001, 05:59 PM
 
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//Nerd Mode on



Here's how I understand it.....



The exhaust generates a pressure wave where the pipe diameter changes. In a 4-1 pipe, theres a strong primary harmonic pressure wave and and a few others. Since there's only one diameter change, these harmonics don't interfere with each other. This pressure wave travels back up the pipe towards the cylinder. When the negative portion of the wave coincides with an exhaust stroke - and more particularly the valve overlap between the exhaust and intake, more exhaust is scavenged and more fuel/air mix is drawn into the cylinder. When a positive wave hits, it doesn't allow as much exhaust and the cylinder gets a short fill. This manifests as a big ugly flat spot, followed by a neck-snapping high spot. The RPM range where these harmonics hit are tuned by the length and shape of the headers.



A 4-2-1 generates several smaller waves at different frequencies. These waves act directly on the motor in the same way as the 4-1 pipe, but they also interfere with each other, both destructively and constructively. Therefore in a 4-2-1 pipe there are lots of harmonics for designers to work with. A well tuned pipe (such as the Akro by all accounts) provides a smoother effect in more spots in the RPM range.



I have a Muzzy, and in my experience (1 bike), it's tougher to tune the fuel across RPM than others I've heard of. It has a big harmonic right around the idle(which really fucks up the idle), another strong wone right at 3K and then it's pretty damped and smooth from there on up.



Anyone else have something to add, or if I've got it wrong - post away! <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/smile.gif ALT=":)">

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post #15 of 24 Old 10-05-2001, 03:04 AM
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I can tell you that there are absolutely NO idle probs with the Akro. She lofts the front wheel much smoother now

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