# Exhaust header design. Motorcycle content **URL:** \ **Category:** Shift518 Automotive\ **Created:** [December 15, 2011, 10:08am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800 "2011-12-15T10:08:49Z")\ **Posts on this page:** 19\ **Page:** 2
**Author:** ![Boxersix](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boxersix/32/6327_2.png) [@Boxersix](https://forums.speedlife.net/u/Boxersix)\ **Post date:** [December 17, 2011, 9:10pm UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/21 "2011-12-17T21:10:57Z")
> [@FS: 88 Conquest TSi SHP!!!!!!!!!SOLD!!!!!!!!](https://forums.speedlife.net/t/fs-88-conquest-tsi-shp-sold/47296/19): > > after the collector or the X pipe in the stock system, does the “tail pipe” length matter? IE the “slip ons”. > > or does all the tuning and exhaust science go on primary and/or up to the collector? It most certainly matters but again is going to be such a finite element in the tuning I wouldn’t go nuts with it. Factor in the length of the system between the merge and the beginning of the silencer and you’ll be right on par with where you need to be. Factoring in the silencer is going to require some fluid dynamics and factoring in the rapid expansion of the pulse within the volume of the silencer body. I’ll post more on the tuned pipe theory later, and link you some ceramic packing as well. ---
**Author:** ![KrazyKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/krazykid/32/6371_2.png) [@KrazyKid](https://forums.speedlife.net/u/KrazyKid)\ **Post date:** [December 19, 2011, 6:46am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/22 "2011-12-19T06:46:45Z")
Thanks Adam! The “silencer” is going to be all of about 6" long or how ever much I can fit under there. Idea is a 3" dia 16ga SS tube how ever long I can make it, lets call it 6", cut down the center. add in two, 1" or 2" X 6" strip of 16 ga flat bar between the 2 halves, making a 3"X4or5"X6" long oval tube. Cap the ends, send a 1.5" or 2" dia pipe through that from the merge, drill the piss out of it, and put a bad ass exit tip on it. Not going to do a hell of a lot (I think) to quiet it down, but hopefully it adds a little bit of back pressure so I dont risk burning up the exhaust valves people say ducati’s like to do with straight pipes. ---
**Author:** ![pitman](https://avatars.discourse-cdn.com/v4/letter/p/4da419/32.png) [@pitman](https://forums.speedlife.net/u/pitman)\ **Post date:** [December 19, 2011, 10:24am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/23 "2011-12-19T10:24:51Z")
[http://www.k20a.org/forum/showthread.php?t=82202](http://www.k20a.org/forum/showthread.php?t=82202) heres a nice write up. i was reading about exhaust designth in a couple books and they say its hard to get it exact just as mentioned in link. but if you take some time youll get it right 2 strokes need back pressure so thats a good easy to find design to look at. looks like you know what you doing but a different perspective might help ---
**Author:** ![PFaux](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pfaux/32/6722_2.png) [@PFaux](https://forums.speedlife.net/u/PFaux)\ **Post date:** [December 19, 2011, 12:30pm UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/24 "2011-12-19T12:30:38Z")
can in buy it when you are donE? ---
**Author:** ![KrazyKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/krazykid/32/6371_2.png) [@KrazyKid](https://forums.speedlife.net/u/KrazyKid)\ **Post date:** [December 20, 2011, 6:58am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/25 "2011-12-20T06:58:21Z")
> [@Praxair Roll Call!](https://forums.speedlife.net/t/praxair-roll-call/47341/5): > > [Megaphones and Reverse Cones Theory and Results | Honda / Acura K20a K24a Engine Forum](http://www.k20a.org/forum/showthread.php?t=82202) > > heres a nice write up. i was reading about exhaust designth in a couple books and they say its hard to get it exact just as mentioned in link. but if you take some time youll get it right > > 2 strokes need back pressure so thats a good easy to find design to look at. > > looks like you know what you doing but a different perspective might help Sweet thanks man! + rep. Ill read through that today. > [@Shipping a Vehicle](https://forums.speedlife.net/t/shipping-a-vehicle/47342/5): > > can in buy it when you are donE? It will be for sale after it does its rounds at a few shows for us as advertisement. ---
**Author:** ![KrazyKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/krazykid/32/6371_2.png) [@KrazyKid](https://forums.speedlife.net/u/KrazyKid)\ **Post date:** [July 25, 2012, 7:26am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/26 "2012-07-25T07:26:56Z")
might as well bump: Bike is running good and rides great. It needed exhaust in a bad way, so I set to work. Made everything but the first few inches of the primaries into the head, no need to replicate them when I can just reuse the ducati originals. I made the muffler baffle like a short version of the Screamin Eagle baffles for HD’s. Made the end caps to slip inside the 3" SS slash cut tip, welded on the baffle tube, wrapped it with packing and secured it with some SS tig wire. Cut the muffler caniset to shape and slide the baffle in. Sealed with gold high temp silicone and secured the baffle with 4 rivets. As you can see its a 2-1 design, I made the merge from 2 mandrel bends splayed together to converge nice and smooth, then slip fit into the baffle nice and tight, then held together with 2 dirt bike exhaust springs and tabs, as well as secured and located with the bracket to the engine case behide the rear barke. Which still needs to be formed against the muffler better and final welded. Primaries are 1.5" 16GA. The forward cylinder was re-routed VS the factory pipe to allow access to the oil filter and drain plug a bit better and knock 2 inches off the total length leading to the collector. The rear cylinder is naturally going to be a bit short to the collector unless I sent the tube forward under the motor and 180’d it back in, which would be hard without a 2" or less CLR. So I decided to shorten the front pipe a bit as mentioned and try to lengthen the rear pipe as much as I could to get them a bit more equal length. the factor ducati pipes were different lengths by 4", the combo of pipes I made is now only 1.75" different front vs back primaries. Dont mind the welds, the tubing is mild steel and its getting header wrapped anyway… so it got a bit more heat and more filler so it wouldnt crack being shaken to death on a V-twin. This was my first exhaust on a bike made from scratch so I was not about to sink the money and time in tigging up SS so clean I can eat off it, when I didnt even know if the exhaust was going to work! So here it is, needs to be wrapped and muffler powercoated. But it looks cool, and sounds great. Much quieter than straight pipes, decel pop is almost totally elliminated, deeper tone, added a bunch of back pressure and richened up the tune. Powercommander is installed and flashed with the “K&N no air box lid and slip ons” file then I can tweak it from there. Runs night and day different on the short blast down the road and back last night. More to come. ![http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120720_002333.jpg](http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120720_002333.jpg) ![http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120720_002345.jpg](http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120720_002345.jpg) ![http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120720_002400.jpg](http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120720_002400.jpg) ![http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120724_234222.jpg](http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120724_234222.jpg) ![http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120724_234231.jpg](http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120724_234231.jpg) ![http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120724_234243.jpg](http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/20120724_234243.jpg) [![http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/th_20120724_233354.jpg](http://i1222.photobucket.com/albums/dd482/CapitalRegionCustoms/th_20120724_233354.jpg)](http://s1222.photobucket.com/albums/dd482/CapitalRegionCustoms/?action=view¤t=20120724_233354.mp4) ---
**Author:** ![JSEnclosures](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jsenclosures/32/6678_2.png) [@JSEnclosures](https://forums.speedlife.net/u/JSEnclosures)\ **Post date:** [July 25, 2012, 7:34am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/27 "2012-07-25T07:34:35Z")
sounds good jacket, gloves, helmet and shorts make me crack up ---
**Author:** ![IOM\_G8\_GT\_888](https://avatars.discourse-cdn.com/v4/letter/i/5f8ce5/32.png) [@IOM\_G8\_GT\_888](https://forums.speedlife.net/u/IOM_G8_GT_888)\ **Post date:** [July 25, 2012, 7:47am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/28 "2012-07-25T07:47:49Z")
^ This, was going to say that lol. looks cool sounds good. nice work! ---
**Author:** ![KrazyKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/krazykid/32/6371_2.png) [@KrazyKid](https://forums.speedlife.net/u/KrazyKid)\ **Post date:** [July 25, 2012, 8:22am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/29 "2012-07-25T08:22:15Z")
yea yeah yea… I know! lol it was 1AM and I just head to hear my hard work pay off. went down the hill, turned around and came back to park it and go home. I could have gotten hit by a mac truck the moment I pulled away too, so I know it doesnt matter the distance. SQUIDLYFE Y0! ---
**Author:** ![bennyfizzle](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bennyfizzle/32/6291_2.png) [@bennyfizzle](https://forums.speedlife.net/u/bennyfizzle)\ **Post date:** [July 25, 2012, 11:03am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/30 "2012-07-25T11:03:45Z")
no me gusta ---
**Author:** ![KrazyKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/krazykid/32/6371_2.png) [@KrazyKid](https://forums.speedlife.net/u/KrazyKid)\ **Post date:** [July 25, 2012, 12:51pm UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/31 "2012-07-25T12:51:18Z")
> [@FS: 1996 audi a4](https://forums.speedlife.net/t/fs-1996-audi-a4/50098/18): > > no me gusta por qué ---
**Author:** ![Boxersix](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boxersix/32/6327_2.png) [@Boxersix](https://forums.speedlife.net/u/Boxersix)\ **Post date:** [July 25, 2012, 2:12pm UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/32 "2012-07-25T14:12:35Z")
You have an odd fascination towards using piecuts :lol Looks good though! ---
**Author:** ![bennyfizzle](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bennyfizzle/32/6291_2.png) [@bennyfizzle](https://forums.speedlife.net/u/bennyfizzle)\ **Post date:** [July 25, 2012, 3:14pm UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/33 "2012-07-25T15:14:27Z")
Idk I just dislike the sound, it looks fucking awesome though! I mean, it sounds like I’d expect it to sound, but I love the bassy thump thump thump sound these make stock. It just sounds like a harley with a shitty exhaust now lol. I don’t think I’ve ever said I liked a stock exhaust over a pie cut, dope, slash cut dump on anything. Weird. I must be getting old. ---
**Author:** ![KrazyKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/krazykid/32/6371_2.png) [@KrazyKid](https://forums.speedlife.net/u/KrazyKid)\ **Post date:** [July 26, 2012, 6:50am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/34 "2012-07-26T06:50:41Z")
> [@WOOT of the day!](https://forums.speedlife.net/t/woot-of-the-day/46135/110): > > Idk I just dislike the sound, it looks fucking awesome though! > > I mean, it sounds like I’d expect it to sound, but I love the bassy thump thump thump sound these make stock. It just sounds like a harley with a shitty exhaust now lol. > > I don’t think I’ve ever said I liked a stock exhaust over a pie cut, dope, slash cut dump on anything. Weird. I must be getting old. the camera phone doesnt do it justice at all. And thankfully sounds nothing like a fart can harley IRL. It sounds completely different. Also the stock exhaust was a silent hum. lol sounded like a hover. haha Ill have to shoot another video with a decent camera. > [@Water Powered Cars... why not?](https://forums.speedlife.net/t/water-powered-cars-why-not/55290/14): > > You have an odd fascination towards using piecuts :lol > > Looks good though! 2.5" CLR to keep it tucked up tight. and the verticle cylinder needed such a tight bend no way a mandrel would get me that. And i think its easier to tape and spin a bunch of wedges around to get from point A to B and do all the math and crap to find the right deg to find a hunk out of a mandrel. I actually started with a bunch of U bends, put about an hr into trying to get them to fit right and got all pissed off becasue they were way too wide. ---
**Author:** ![Boxersix](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boxersix/32/6327_2.png) [@Boxersix](https://forums.speedlife.net/u/Boxersix)\ **Post date:** [July 26, 2012, 7:26pm UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/35 "2012-07-26T19:26:04Z")
[Www.woolfaircraft.com](http://Www.woolfaircraft.com) next time you need a tight bend. They’ll make it for you if not stocked ---
**Author:** ![ds50r](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ds50r/32/3491_2.png) [@ds50r](https://forums.speedlife.net/u/ds50r)\ **Post date:** [July 26, 2012, 9:37pm UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/36 "2012-07-26T21:37:47Z")
So I’m a bit late with this but this is the exhaust a fellow svrider made I think it looks killer especially with the custom single sided swing arm ![http://i267.photobucket.com/albums/ii300/dom300zx/Snapbucket/38B39934.jpg](http://i267.photobucket.com/albums/ii300/dom300zx/Snapbucket/38B39934.jpg) ---
**Author:** ![KrazyKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/krazykid/32/6371_2.png) [@KrazyKid](https://forums.speedlife.net/u/KrazyKid)\ **Post date:** [July 27, 2012, 6:37am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/37 "2012-07-27T06:37:23Z")
> [@Who can find what wrong here](https://forums.speedlife.net/t/who-can-find-what-wrong-here/50284/11): > > [Www.woolfaircraft.com](http://Www.woolfaircraft.com) next time you need a tight bend. They’ll make it for you if not stocked yeah I got stuff from them too, transitions and some tube in the past. I didnt pay attention to how tight they bend, thats cool. 150-065-150-090-1010 1.500" 0.065" 90 Deg 1.500" Tight Mild Steel $18.50 150-065-250-180-1010 1.500" 0.065" 180 Deg 2.500" Tight Mild Steel $16.00 2.5clr for a 180 or 1.5clr for a 90… It would have taken atleast atleast 3 180s which wouldnt be that bad price wise actually. Now that I know this design works, if I get adventagous maybe ill get some SS 180’s and make a really nice one. ---
**Author:** ![KrazyKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/krazykid/32/6371_2.png) [@KrazyKid](https://forums.speedlife.net/u/KrazyKid)\ **Post date:** [July 27, 2012, 6:38am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/38 "2012-07-27T06:38:02Z")
pics or a build thread for that SV? I like the design. ---
**Author:** ![ds50r](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ds50r/32/3491_2.png) [@ds50r](https://forums.speedlife.net/u/ds50r)\ **Post date:** [July 27, 2012, 7:05am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/39 "2012-07-27T07:05:56Z")
He sent me that via a text message he haven’t posted a build thread yet I think it would look sick on any twin the swing arm is off of a Honda vfr easy to modify and make work [Previous page](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800.md?page=1)