I soo hate to see pipes with telescoping headpipes,header pipe,next is a larger pipe slid over the head pipe and so on,,PG,Leo vince,Technigas,etc. like this method cause its cheap,,works fine when the exhaust gas is going out,but what about the reflected returning mixture charge before the exhaust port closes?Kinda like a down hill skier on a stair well!Tapered head pipes are where its at,gotta have that smooth flow(in both directions) to have a decent pipe..A quiet pipe would be ideal for this ride,the Penton/KTM dirt bikes had the most simple set up kinda like this;
Ive used this baffle setup on many pipes and love it,doesnt hurt the power at all,but makes it nice and quiet..
Well done tsimi!!Looks like a nice pipe!Headpipe is 1.1 degrees,2 stage diffuser,1st stage 36.1-178-68=5.3 degrees,2nd stage 68-128-100.2=7.3 degrees..2 stage baffle,1st stage 100.2-70-87.5=6.7 degrees,2nd stage 87.5-140-24.5=12.7 degrees..total length 790,headpipe is 28% total length (30-32% ideal),headpipe+diffuser is 66.5% total length (64-68% ideal).. From the belly back is the same as the C16,the fwd sections were redesigned for a slightly lower max rpm,but smoother delivery..As usual Yasuni has built a pipe that others will copy(maybe even me!!),it should run verrry well!!!
Last Edit: Nov 15, 2017 12:28:38 GMT -5 by 90GTVert
Here are the pipe measurements. Some of the pieces are oblong so I got the average of the diameter. My smart phone isn't smart enough for me to write over a picture of the pipe but you should get the idea.
From the dimensions,we have a 211mm long headpipe at 1 degree then a 3 stage diffuser of 185mm at 2 degree,54mm at 6.9 degree and 142mm at 6 degree Baffle cone is 213mm at 9.1 degree.. Total length of 880mm Headpipe is 24% of total length (ideal is 30-32%) Headpipe+diffuser is 67% of total length(ideal is 64-68%) This is a quite simple pipe with a few strange dimensions,the 880 TL gives an estimated 9800RPM peak power,,styling and sex sells!!
Last Edit: Nov 15, 2017 12:29:16 GMT -5 by 90GTVert
More pipe tech;How to measure a pipe,carefully examine the pipe and determine where the angles change(headpipe to 1st stage diffuser,1st stage to 2nd stage diffuser,and so on,,Measure the OD(outside diameter)of both ends,record measurements,,next use a piece of soft wire(coat hanger,copper,or aluminum)and place it on the SIDE of the bend,exactly in the center,mark the length and straighten the wire for measurement,continue to the next cone,etc;
Hope all this makes sense!!
Last Edit: Nov 15, 2017 14:40:21 GMT -5 by 90GTVert
Had to average some of the dimensions due to the number of segments,but here is the results; Has up to date dimensions,tuned for around 11,250RPM,should be a strong pipe with the right cylinder porting!
Last Edit: Nov 15, 2017 12:36:46 GMT -5 by 90GTVert
So here I was in my fab shop with a pipe cut in half so I built a pipe, saving the header, with pieces of exhaust tubing-no science or ruler was used. I tack welded it all together and gave it a good rubdown with brake cleaner and applied HVAC silver tape to the non welded joints just to ride it around the block a few times and see what it would do. The HVAC tape withstood a few miles of heat and I removed the tape with a heat gun and razor blade then finished it off with brazing rod, filling all the gaps. The HVAC tape let me do any mods first without doing the final welding.
We covered the sectioned headpipes,and hydroformed headpipes,here is another method that yields a decent part. A mandrel bent exhaust tube is selected for size using the big end of the headpipe,a center line is drawn on top and bottom of the pipe,then the small end circumference is calculated(say 30X3.1416=92.248,then divide in half = 47.124),that # is transfered to a paper strip and laid on the side of the pipe between the 2 center lines,then we have the 'pie slice lines'for cutting..
The elbow can be cut in shorter sections for easier pie slicing,here they are cut and pie sliced;
They are far from round then,so channel lock pliers are used to get them close before welding them;
Here is the final part,its far from a 5 minute fab,but does work well;
Last Edit: Jun 5, 2019 12:48:24 GMT -5 by 90GTVert
Senna1Rossi: Thanks renagade281!
May 23, 2016 14:59:12 GMT -5
Fox: I don't really know how to say this but straight. I am Dave's Girlfriend Kellilee and bluntly and VERY SADLY he passed away early Tuesday morning. I know he would want ya all to know this. Thank You Brent for befriending my love he was very happy on here!
Jun 18, 2016 16:26:04 GMT -5
Fox: www.gofundme.com/29mgf6b8 I hope it is ok to pass on his gofundme page link. If not you will un-post it I'm sure. Thanks again all!!
Jun 18, 2016 16:31:18 GMT -5