Homemade expansion chamber

[Frankenstein]

TIG is the answer if you can buy the gear.
Less heat distortion and works well with thin metal.
Need gas and a DC welder.

Tig would make it enormously easier, even mig, if you want to head to that then definitely do it, arc is my flavor and it suits me well. Nothing feels as accomplishing as the fine spray of warm shattered flux to the face, like striking gold you just materialized out of thin air.

 

[Steve Best]

The MIG needs to be gas shield and not flux-core. A lot of guys have "needles" poke thru the joint, not that it affects flow. Just kinda funny.

 

[Frankenstein]

The MIG needs to be gas shield and not flux-core. A lot of guys have "needles" poke thru the joint, not that it affects flow. Just kinda funny.

I specifically mentioned arc was my "flavor" and it comes with more than enough Flux.

 

[butre]

oxy fuel is my flavor. electricity is for chumps

 

[Frankenstein]

oxy fuel is my flavor. electricity is for chumps

Nothing like reversible dc currents to weld absolutely anything. You can even pick your frequency for things like tinfoil hats.

 

[KCvale]

View attachment 75709 I'm trying to make an expansion chamber, cause I need one and why not.
I'm not doing this the right way, to be honest.

Well, it helps to know exactly what an Expansion Chamber does, How, and Why before you make a pipe ;-}

2-stroke engines have raw fuel waste out the tailpipe, an Expansion Chamber is a TUNED pipe that shoves some of that raw fuel back in before it fires again.

Just follow the raw Green gas...

If your pipe is not tuned you may not be getting any fuel back in, or shoving everything back in including spent fuel exhaust.

The shape and size of the chamber determines how much of a reverse boost you get, but it's the length of the header pipe that sets the timing, and timing is crucial.

 

[motorbiek]

got this functional today. it's too fricking loud! the tinny metal makes a really loud noise even with a muffler. darn. makes a lot of low and midrange power. top end is too lean so I can't comment on that side of performance yet. will upload a video soon

heres the video: https://www.flickr.com/photos/148254497@N08/33138383096/in/dateposted-public/

 

[gary55]

Exhaust wrap will cut a lot of the noise. Might want to run it a while first to see if you have any leaks that need repaired before wrapping. So if the pipe is gangsta, and you wrap it. Does that make you a, oh forget it.

 

[Street Ryderz]

Exhaust wrap will cut a lot of the noise. Might want to run it a while first to see if you have any leaks that need repaired before wrapping. So if the pipe is gangsta, and you wrap it. Does that make you a, oh forget it.

Lol good one brother!

 

[motorbiek]

modified the pipe a little bit. changed stinger to 3/4". that quieted things down and its running really good. there are still some pinholes holes in the pipe, gotta find em.