home made exhaust/muffler

[outdoorsman310]

I made this yesterday for my 1970 c20 355 engine, it sounds great to me although unfinished. I wonder if it will work the same with a straight piece of pipe as with this bendy one. i need to do the other side and address ground clearance, but it sounds great.
https://scontent-b-lga.**.fbcdn.net/hphotos-ash3/t1/1503976_768754119806913_365926113_n.jpg
https://scontent-b-lga.**.fbcdn.net/hphotos-prn1/1512588_768755039806821_1831419493_n.jpg

 

[Zeke]

What in the hell....?

 

[outdoorsman310]

I added the pipe from a honda or something. the previous owner put the glasspack stuff together

 

[aussiek2000]

I don't get it

 

[G_P]

Replacing the muffler with a straight piece of pipe would have been easier........

 

[ex-x-fire]

I don't know if it'll be louder or what.

 

[mechan]

Were the doors closed in the shop and were you painting prior to deciding this was a *great* new way to plumb the exhaust?

 

[outdoorsman310]

the bendy pipe is welded to the pipe before the glasspack and to another hole after the glasspack but i didnt feel like welding up the part after the muffler fully so the weld is just holding it together. Why? I wanted to make a good exhaust sound and was designing a muffler but did not feel like or have time to make it so I tried this. it is about the same volume as a regular glasspack but the sound is higher quality than a glasspack and sounds more like a chambered muffler

 

[outdoorsman310]

and it does not sound like a straight pipe. I tried that and it sounds terrible

 

[justanengineer]

1 inlet and 1 outlet, the extra pipe is just to alter the sound or am I missing something?

 

[Gareth68]

I think I will have to pass on this design for my own vehicles.

 

[Jay Sco]

Ok. You have 200+ posts so I don't think your trolling. But I don't get it either. Can you draw up a pic, or mount it to something and take pics? I'm not sure what's what here.
And calling it the 'bendy' pipe isn't helping matters. How about the bent pipe? Bendy makes it sound either flexible or like a crazy straw.

 

[Zeke]

the bendy pipe is welded to the pipe before the glasspack and to another hole after the glasspack but i didnt feel like welding up the part after the muffler fully so the weld is just holding it together. Why? I wanted to make a good exhaust sound and was designing a muffler but did not feel like or have time to make it so I tried this. it is about the same volume as a regular glasspack but the sound is higher quality than a glasspack and sounds more like a chambered muffler

That's the best part. Nothing like a little CO in the cabin.

 

[GTA Matt]

It's the O-pipe I've been hearing about http://kalecoauto.com/index.php?main_page=product_info&cPath=11&products_id=42

 

[garboui]

 

[outdoorsman310]

1 inlet and 1 outlet, the extra pipe is just to alter the sound or am I missing something?

yes, the other pipe is to alter the sound. I thought the curve back would be somewhat of a vacuum or restriction so it doesnt just act as a straight pipe. I am no engineer or physicist. This was an experiment to try to make my own type of muffler with a good sound. Here is a poor quality drawing of the exhaust system.
http://www.garagejournal.com/forum/attachment.php?attachmentid=304331&stc=1&d=1388274278

 

[outdoorsman310]

o pipe eh? lol. I wanted to see if anybody has made their own mufflers or anything like the contraption that I made.

 

[1upmoto]

not sure if serious....

 

[chrisa7164]

mufflers are cheap..why reinvent the wheel?

 

[Aspen RT]

I was thinking of making mine in the shape of the Mopar "M".......

 

[PCO6]

o pipe eh? lol. I wanted to see if anybody has made their own mufflers or anything like the contraption that I made.

No.

 

[outdoorsman310]

For anybody that does not understand what I have changed, I made another poor quality diagram to show what I have done. I guess I will try making this with both a straight, and an L shaped "equalizer" pipe to bridge before and after the glasspack and see how it sounds and go from there.

 

[Jay Sco]

Your not 'equalizing' anything, your bypassing it. I applaud your effort to try something....different. And I really hope it works out. But I can't help but to ask myself if this belongs in the WTF thread.

 

[outdoorsman310]

I can see where you would get that. its not really equalizing, I just said that to give the pipe a name. basically i had to drive around with a horrible sounding straight pipe for a few days due to an injury and i was going to throw the glasspack back on but wanted to change the sound because i didn't like the regular glasspack sound and wasn't going to go and buy flowmasters or build custom mufflers in that time. i was surprised by how good the exhaust sounded and decided to post on here to get some input on exhaust designs and such but just got a bunch of ****.

 

[Jern]

Is it possible that the angle of the pipe in front of the glasspack could cause a vacuum effect (like crank case evac systems) at lower flow rates (part throttle), and then as the glasspack becomes more restrictive (full throttle), pressure would bypass the glasspak?

Or maybe it's acting like a resonator?



Try the other side and see what you get. It'd be interesting to see what the flow is doing at different rpms.

 

[Haveblue]

It made me think of Helmholz resonators in intakes, so I did a quick search on HR exhaust..seems you are on the right track Not such a crazy idea after all!

 

[outdoorsman310]

hmm those are interesting. I thought somebody other than me has had to do something like this since the invention of the internal combustion engine! I thought the angle of the pipe I added would use something like the venturi effect to prevent a complete bypass of the glasspack. I will experiment on the other side with a straight piece of pipe and go from there as that seems to be a relatively easy option. I just hope it doesnt bypass the muffler and sound like **** but I will see. my muffler design had something similar to those resonators so I guess it wouldn't sound too bad If i ever build it.

 

[astroracer]

Google "X" pipe. I would suggest doing that. The X is an equalizer and will mellow the exhaust note between the two pipes, plus adding a bit if low end torque.
Mark

 

[Jay Sco]

Ah, you just didn't feel like buying different mufflers, well then carry on. I'd say give the straight pipe a shot, glass packs are pretty much a straight through design anyway. I'm no physicist but I'd guess with that back bend maybe 30% of exhaust got rerouted through your design. With the straight piece added I'd say it would be more like 50%.
Didn't mean to give you ****, but those pics you posted had me scratching my head.

 

[1953mercury]

It's going on a Chevy. Perfect. Mike

 

[alwaysFlOoReD]

An idea I have is to divide the exhaust flow and then aim both at each other inside a chamber. This would cancel out some noise and pulsation. What you built is similar to the idea I have but yours would seem to be tunable for rpm by changing the length of the extra pipe.

Richard

 

[Mr.N]

I thought the angle of the pipe I added would use something like the venturi effect to prevent a complete bypass of the glasspack.

Your modification has nothing to do with the Venturi effect.
You're bypassing the muffler and have chosen an angle of entry that creates back pressure in the muffler. If anything your doing the opposite by opening a path for more flow and then creating more turbulence in your main tube. I'm not sure you'd impress Mr. Bernoulli with that setup.

I would suggest working on other modifications before you do to much with the exhaust. The comment about not fully welding the tubes and the pictured welds has me concerned for you and your passengers.

 

[outdoorsman310]

there is enough air flow through the rust holes in the cab to not be worried about co

 

[brucer]

put an H-pipe on it and be done..

 

[ZAPPER68]

LMFAOLOTF....good one, now I have to wipe the coffee off of my computer screen, thanks a lot

 

[yaidunno]

It made me think of Helmholz resonators in intakes, so I did a quick search on HR exhaust..seems you are on the right track Not such a crazy idea after all!

Not quite. Those resonators are a sealed chamber that doesnt re enter the exhaust. Its usually tuned to cancel a certain frequency.

 

[Haveblue]

^ That was my point actually! the pic I posted on the left is a bit misleading, the red arrow is pointing to the capped end of the chamber. I agree with whats said about x, or h pipes. The best placement, from my understanding is at the hottest place in the exhaust, usually fairly close to the engine.

 

[Lippyp]

I thought he'd come up with an X or H pipe for a single exhaust!

 

[1SlowFormula]

I cannot see the original pics, but I do see the sketch and would say yes I have done the exact same thing in my firebird before it was turned into a drag car, look into exhaust cutouts, and you will see where a lot of people and aftermarket products that support adding a muffler bypass back into the tailpipe so that is still exits outside the vehicle. I agree it sounds better that glass packs and not as loud and harsh as straight pipesmine was loud but mellow at idle and part throttle, but stomp on the trottle it got really loud...

Also I know guys who have done the same thing but put in an electric cutout valve to go from almost stock quiet to loud at the flip of a switch, all existing out the same tailpipe. I had one buddy in NJ, after we left a drag strip who got pulled over because the cop heard 2 cars Quickly and Loudly accelerate from the light ("exibition of speed" would have been the ticket) and when my buddy was pulling over he flipped the switch back to stock exhaust and when the cop walked up the cop asked him to start the car and he told him that it was running, the other guy with just the loud exhaust got the ticket.

 

[Goldhawg]

Wow....all I can say is wow. Viva la diferencia! I've not laughed so hard in a while.