Create a Custom 2 Stroke Exhaust System - DIY Expansion Chamber."

[@malcrandall1309]

Sincere thank's for posting! Your pipe looks a work of art! The dream team of you and Alex at 2strokestuffing working together!

[@AutoBeta2T]

Thanks Malc, I'm hoping it'll work well too. If not I'll stick it on the wall in the lounge 😀 It would be cool to do something with Alex, but he's probably not aware of me... maybe one day!?

[@EinarLerschen]

Glad to see you back in business!

[@AutoBeta2T]

Eikka, many thanks, it's good to be back. 😄

[@iancooper5615]

Great vid dave, sorry to hear stuff not going 100% in your private life pal, hope your Dad is ok. Gonna steal your iron ball idea for shaping, love it. 👍🏼

[@AutoBeta2T]

Cheers mate, yes it's not been a great year this year but hopefully it'll end on a high! Dad's improving so that is good. Plenty of balls here: m.ironfinials.co.uk/?url=https%3A%2F%2Fwww.ironfinials.co.uk%2Fmetal-balls.html&#2820 Not sure where I got mine from but they look the same.

[@JohnBobRoger]

Dave...I have a new to me 1982 AR80. Going to get her going and then try to find a pipe but may have to attempt a build if no specimens over here...Thanks to you and the other fellas for paving the way. Was an RD/RZ guy back in the day....Awesome vids..Cheers..: )

[@AutoBeta2T]

Cheers John, where abouts are you?

[@CliveSwabs]

KTM sx 85 exhaust chopped up and modified .

[@Kieranzxt1]

Great to see you back and the project progressing 👍

[@AutoBeta2T]

Thanks Kieran - pleased to be back 😁

[@Verificador119]

Very nice work,I used to make racing exhaust in the ´90s with similar methods. Congratulations !

[@AutoBeta2T]

Thank you 😊

[@andycompton4885]

Most excellent sir and great to see you back 👍

[@AutoBeta2T]

Thank you Andy - it's good to be back. Hopefully I can stay back too!

[@markthoughtswithukrainemas2072]

Ive just pulled out my old photo album ,, when I had my old Kawasaki AR80 with standard gearing I would do 65mph ( ill let you google gearing and where red line would take it ) I went and got it Stan Stevens tune done on head and port that was it and it would do 76 MPH on standard gearing I seem to remember it was just under 11,000 RPM , with out a doubt with correct gearing it would of done 84 MPH as it was pulling well at 76 MPH into red , so just food for thought guessing with Clock error I might of been 8 to 9 % out so I was genuinely doing 70 + MPH on standard gearing . SO with better tune Exhaust etc etc .. Im sure you will get there . I had a Yamaha RD125LC partly derestricted got 98 MPH out of that so probably 88MPH real speed with id say 19 BHP

[@AutoBeta2T]

Hi Mark, I definitely hope so. I know they were near in the original magazine article. I need to think about getting the gearing somewhere near for testing soon.

[@darrelltaylor4542]

Great work Dave look forward to next installment ,all the best with the family side.

[@AutoBeta2T]

Cheers Darrell 😊 Hopefully it won't be too long this time.

[@NaiquiCool]

Hi from 🇨🇵, an interesting vidéo for me...again,thanks👍

[@AutoBeta2T]

Merci Naiqui 🙂

[@dariusjackson5603]

Dude i love your channel im fixing to start making bikes from scratch dt100 chassis copy with stronger steel with blaster engine and cafe racer look but track ready with a blaster 200 engine and kx85 suspension.also will do 90 so highway unable i need to make a custom pipe for it though your saveing my ass

[@AutoBeta2T]

Hi Darius, cheers and sounds like some cool projects you have going on there! I'm pleased the videos are helping 😊

[@paradiselost9946]

havent done this in ages... i always just fudged my peak rpm around a bit until i ended up with length/diameters with nice even intergers... like 25mm over 125mm lets you make 5 rings at 25 long with a 5mm increase... rather than 25.2, etc... i felt 200 rpm or so here or there, or a bit of compromise on the band was worth the hassle of non-laser cut accuracy... all those little half and quarter mm adds up! lay em out with a piece of filler rod marked at appropriate intervals, bent in place. can guesstimate bends to a certain extent. throw the odd cardboard former on for diameters and tweak for clearance where its an issue... learnt early on that theres a limit to how sharp a bend you can take in one go before the turbulence chokes you. this shape was really easy enough to hydroform, but that takes some fiddling with the initial layout to get it popping right... miss my nsr150. almost motivated to start playing with it again. sigh. making a piston and sleeving a cylinder... sigh. if im going to blow parts up id rather know that i can make them again... limited number of pistons available. odd size. no alternatives.

[@AutoBeta2T]

@paradiselost9946 Great info - thank you. I'm interested to hear at what bend radius you found power dropping off? I try to keep my radius quite large and pie cuts less than 15 Deg (total). I'm wanting to hydroform a full pipe at some point. I've hydroformed headers before and had good dimensional accuracy but I've heard it can be difficult to control the belly diameter and allowances have to be made for the extra stretch in the larger diameter areas.

[@paradiselost9946]

@@AutoBeta2T min bend radius... never really found one! as tight as i could manage and still have something to weld. but yes, no more than 15 degrees included on each cut. try and be lazy, take it in two pies versus 3 or four...and you just wasted a lot of time by "saving" some. the pressure wave doesnt care about the abrupt changes, but the gas flow definitely does. hydroforming, it does get tricky on the merge from trumpet to belly, have two conflicting curves going on... that i usually just avoided by not doing too much on one go, joining three sections still beats joining... yeegods... done 109 before? never again! no problem if it had a mould but we arent that rich, are we? the header/diverger as a separate with excess to trim off and let the flare do its thing, same as the converger. bellys just some sheet in the roller as always.

[@CliveSwabs]

Have u ever tried using Polylok stainless flexible exhaust pipe for the downpipe? U can get it with collars on which you can slot and clamp if u wish .ive just put 2 pieces on a Formula 125 twin and they are so far holding up perfectly .im just putting some on an RG 2t

[@AutoBeta2T]

Hi, is this the stuff? www.everyexhaustpart.com/cart/polylock-flexible-tube

[@CliveSwabs]

@@AutoBeta2T ye thats the stuff .u can get it any size and with collars on too if u ask em..look on e bay and make some enquiries

[@AutoBeta2T]

Will it extend and contract?

[@postulator890]

Just remember, that O2 sensor takes up volume in header pipe and will affect things and you might get a funny return pulse to port.

[@AutoBeta2T]

Hi, it's an egg probe but yes it will effect the pipe. Maybe a back to back test if probe in v probe out?

[@weegaz22]

Fantastic, its looking really good now, are you considering doing any kind of electroplating just as a bit of corrosion prevention?

[@AutoBeta2T]

Hi Gaz, probably not as I don't think this will be the final pipe. I'll maybe soak it in oil when it gets hot to try and prevent the surface rust. A mate of mine has had good results with clear heat proof lacquer...

[@Ni9kye]

Nice work, sorry to hear about the old fella

[@AutoBeta2T]

Cheers Ni9kye 🙂 Dad's getting there now I think 🤞

[@markthoughtswithukrainemas2072]

I think women are to be avoided ,, been single for 10 Years myself I do mean 100 % single , No problems, no heart ache , no arguments , and financially much better off, my advice would be do things that make you happy , only do it for yourself , -- Glad your back

[@AutoBeta2T]

Cheers Mark 😀

[@Graters1989]

Hey mate I know you’re into high performance. How come you haven’t done a video comparing a belly stinger vs conventional. I used a belly stinger Jennings or bell said it reduces noise and improves midrange and definitelt found it does both. Be interesting to see on the dyno. I literally just inserted the stinger so it terminates in the belly section of the chamber and welded it up at the end of the baffle cone.

[@AutoBeta2T]

Hi, it is something I have wondered about doing. Maybe a test one day I recon :)

[@Graters1989]

@ the moped guys use the belly stinger a L kit. Also for easy tuning they just use a valve at the end of the baffle cone in addition to belly stinger so they can quickly change the stinger (outlet restriction) parameters. Makes for faster tuning.

[@watchyMCFCwatchy]

Have you considered the alternative method of using 2 single sheets welded and pumping with oil to form the shape?

[@AutoBeta2T]

Yep - I have hydroformed a header before but not a full pipe. The plan is to do one at some point.

[@wtmotobikes8838]

What thickness of metal do you use for making your pipes out of?

[@AutoBeta2T]

Hi - 0.8mm

[@wtmotobikes8838]

thank you. im going to be trying to make some pipes myself soon. first time @@AutoBeta2T

[@AutoBeta2T]

Cool - I hope they go well. The best pip I can give it to take time on fitment - it is key to not blowing holes in them then having to fill - Have fun and let me know how you get on.

[@PPekka]

I was just wondering. Does the curving of the pipe effect the performance much compared if it would be straight as in the drawings and simulators and would it be difficult at all to rotate the cylinder and the piston 180 degrees? You could have the pipe go straight to the back under the saddle and that would let you do some kind of ram air intake if you have the carb in the front 🤔

[@AutoBeta2T]

Hi PPekka, I haven't done any tests but from what I have read it does make a difference.

[@exsoulagent]

Great work 👍🏻

[@AutoBeta2T]

Cheers ☺️

[@randywooldridge9064]

Dang good job

[@AutoBeta2T]

Cheers 😃

[@76Teme]

Make the end baffle cone diameter 16.8.mm and try 👍

[@markaddy53]

great job that lad well done keep it goin

[@AutoBeta2T]

Thanks Mark - will do 😀

[@BG-Tuning]

whats the 'pipe' called at 14:00

[@AutoBeta2T]

I'm making part of the header pipe there.

[@BG-Tuning]

@@AutoBeta2T Yes, but not the thing your welding, but the thing you hang the sheet metal on?

[@AutoBeta2T]

@BG-Tuning ah, I'm not sure. It's just a bit of pipe I use.

[@ballockybill2277]

Fair play to you man !

[@AutoBeta2T]

Cheers mate :)

[@hunter9372]

Nice job, Can I ask what software your using to calculate dimensions.

[@AutoBeta2T]

Hi, I modified a design by Graham Coker in EngMod2T. This pipe was for a AM6 engine but didn't rev high enough. It was just chance that it worked well with this engine. I have since used Graham Cokers' exhaust design program to try some other designs in EngMod2T. I hope to try a few when I get a chance too. Graham Cokers' spreadsheet is really good and I know of a lot of real world tuners that use it to produce good pipe designs.

[@hunter9372]

@@AutoBeta2T Thank you for your reply I shall look up Graham Cokers.

[@AutoBeta2T]

facebook.com/graham.coker.54

[@dwhxyz]

Great video and good to see you back! What EGT sensors are you using ?

[@AutoBeta2T]

Hi, they were from tcdirect - Type K Thermocouple - Inconel 600® Sheath (1100ºC) 3mm dia x 100mm long - www.tcdirect.co.uk/product-2-190-1/Mineral-Insulated-Thermocouple-with-Pot-Seal-0-25-0-5-0-75-1-0-1-5-and-3-0mm-diameters And thank you for the feedback - it means a lot.

[@dwhxyz]

@@AutoBeta2T 👍👍

[@dwhxyz]

@@AutoBeta2T Hi again, my RG500 is close to going on the dyno again and I think I really need to fit some EGT probes to each pipe before I do this time. Do the TC thermocouples bend ok as I would need to bend them ~90 degrees as soon as they exit the the compression fitting ? I assume you are using the adjustable compression fittings from TCD - which ones did you go for ? Do they supply the weld on bosses or did you source them from somewhere else ? And finally what are you using to read/log the temperature readings during your dyno runs ? 👍

[@AutoBeta2T]

Hi, yes they bend easily. They are 3mm dia ones. I may have the part number somewhere at home. The fittings are at 1/4 NPT (I'll double check) but others could be used I guess as long as it's for the 3mm probe. Boss wise I made my own but I saw some on eBay for about £8. My Dyno has two inputs for egt/cht so I'll just stick them in there and it will overlay it on the run. I need to get a gauge for real world testing. I do have a SPA one but it broke... Stage 6 maybe. Could do with a peak egt memory function.

[@dwhxyz]

@@AutoBeta2T Thanks you so much for taking the time to reply that's all been really helpful. Packaging/fitting 4 X EGT probes to the RG500 is certainly going to be challenge! The other issue is a decent gauge and data logger. The MGL Avionics Vega TC-4 CHT / EGT (see parts4aircraft for other gauges) is probably the most practical gauge I could fit but is does not data log. The other option is the reveltronics utcomp pro which for its capabilities including data logging looks very good value but I'm not keen on it's 3.2" rectangle screen!

[@Trevorpartington-yc6ri]

YAY! he's back !

[@AutoBeta2T]

Good to be back, thanks Trevor 😀

[@ÉoTeixeira-g]

você teria algum curso ou alguma maneira de me ensinar sobre escapamentos 2T? eu tenho muita vontade de aprender mas não tenho quem me ensinar

[@AutoBeta2T]

Hi, I don't have a course, hopefully watching these videos will give some of the information on how to build them. 😊 For the next pipe build I'll look to show more on the construction side. Also, I'll try to make something that shows how I come up with the design too.😊

[@ÉoTeixeira-g]

@@AutoBeta2T muito obrigado bro, eu sou um intusiasta em 2t e como eu tenho 17 anos aqui no brasil não posso atuar na area que eu gosto (preparação de carros 2t) vou assistir a todos os videos e trago o resultado do ganho de performance que consegui com meus escapamentos

[@AutoBeta2T]

​@@ÉoTeixeira-g brilliant! I wish you lots of success with your exhaust! Let me know how you get on 😊

[@mattfear6201]

Hi. Nice job on that. I might try making a pipe.

[@AutoBeta2T]

Cheers Matt 🙂 Good look with your pipe!

[@mattfear6201]

What program do you use to get the templates for cutting?

[@AutoBeta2T]

Hi Matt, I used Mota in this video but it's just a feature of the Mota program that is a 2 Stroke simulator and does cost over £100. A lot of people use this program for printing their cone templates: www.conelayout.com/

[@Scissors69]

Do you have the two sensors so you can get an average of the exhaust temp?

[@AutoBeta2T]

Hi Dave, yes. I saw the idea on Jeff Henise's site here: www.highwaymanbikes.com/race-pipe-tuning-for-the-yamaha-td3-250cc-twin/#more-640 Additionally I want to establish a base line temp for egt 1 and 2 on the Dyno and replicate it in reality on the road. I've a feeling that the pipe will cool more on the road than on the Dyno. I can then make adjustments to the pipe tuned length on the road. Hopefully giving a little better performance.

[@dwhxyz]

@@AutoBeta2T Thanks for posting that link 😎

[@markthoughtswithukrainemas2072]

Your head is somewhere else thats why your making mistake ,, you need to just laugh and enjoy what your doing

[@AutoBeta2T]

Haha, I do enjoy it. I've just forgotten so much I'm making errors relearning lessons from before. 😁

[@andyhoms2001]

Time for some new gloves big homie! 😅😅😅

[@laburette]

Weld done! 😊👍

[@AutoBeta2T]

Thank you! 😃

[@tinolino58]

Much to nice 😍

[@AutoBeta2T]

Thank you 🙏

[@topfuelteddy]

Really interesting stuff, ive done a few of my own fag packet design pipes for my valves , can i ask what tin snips you use ?

[@AutoBeta2T]

Hi Teddy, cheers 😁 The tin snips are Stanley. I did buy the red and green left and right handed ones but actually I find the yellow universal ones good for everything. How did your pipes work out?

[@topfuelteddy]

@@AutoBeta2T Thanks bud , they've actually got them on offer at Toolstation at the moment, my pipes looked great but never really got to test any of them because when my son was born 10 years ago I just chucked the bikes in the garage and covered them up , got 3 , all LC's in various forms, some a bit trick . My mates had the AR 80 s , I had the rd80lc back in the day , remember going to the bmf rally and one of my mates went to start his bike turned on the petcock , petrol pissed everywhere, someone had knicked his carb , for the AR 50 no doubt , happy days , be sure to keep up with your channel.👍

[@AutoBeta2T]

hi Teddy, how are the tinsnips?

[@topfuelteddy]

@@AutoBeta2T Hi mate Only just got back this morning from a holiday abroad. Was watching all your really interesting vids poolside. I've used the Australian guys pipe calcs software to work the cones, AuMechanic. Do you recommend any other pipe calc software? Thanks for the reply btw .

[@AutoBeta2T]

Hi Teddy, I usually use Graham Cokers' software (CRP) but he doesn't have his website anymore but he can be contacted through Facebook. It's a really good calculator that has different specs for cc and application. Other than that I use EngMod2T.

[@trunevpavel4463]

good afternoon, is it possible to contact you in any instant messenger or social network?

[@AutoBeta2T]

Hi, my email is [e-mail]