Bug vs. Bus mufflers

Mr. Bubblehead · Posted: Mon Jan 30, 2006 10:03 am Post subject: Bug vs. Bus mufflers

Other than one outlet vs. two is there a difference between type 1 and type 2 mufflers (1600cc engine)? Are the internals different? I need to replace the muffler on my bus and I have a new bug muffler here and I was wondering if I could just weld up the right-side outlet and use it.
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ronnie · Posted: Mon Jan 30, 2006 10:24 am Post subject: Re: Bug vs. Bus mufflers

krusher · Posted: Mon Jan 30, 2006 10:42 am Post subject:

I think the internals are differant, I had a friend who did this and it made the engine run hot and like shit, like it was blocking up one side of the engine.

VWBobby · Posted: Mon Jan 30, 2006 12:35 pm Post subject:

A stock bug muffler sucks enough power as it is, image how bad it would be with 1 outlet welded shut! Cool

It would be like sticking a banana in the tailpipe.

Wayland · Posted: Mon Jan 30, 2006 8:13 pm Post subject:

It depends on the muffler. As far as I know bus and bug mufflers are the same inside (really not much inside them at all!) What you would have to consider though is what side the heat riser pipe comes down. It must exit in to the tailpipe (so you want one w/ the heat riser pipe coming down on the lt. side) You'll also have to fabricate a bracket to support the tail pipe. Unless you are attatched to the stock look, why not go for a header and single QP system. Stock mufflers are VERY innefficient, and restrict motor too much in the high rpms.

oilspot · Posted: Mon Jan 30, 2006 10:10 pm Post subject:

Mr. Bubblehead · Posted: Tue Jan 31, 2006 5:55 am Post subject:

iamdonquixote · Posted: Tue Jan 31, 2006 7:26 am Post subject:

guatebus · Posted: Tue Jan 31, 2006 8:29 am Post subject:

I ran into this issue last year when I got rid of a crappy header on my 1600dp. I wanted to go stock muffler to experience the joys of a properly functioning heat riser. Unfortunately none of the VW parts shops where I live (Central America) had bus mufflers...only bug mufflers were available. I didn't want to pay huge dollars for overseas shipping of a (heavy) muffler from the States so I went with the bug version.

I considered closing off one outlet but what I did finally was rig up a two outlet system. Of course you don't want to have the pea shooter pipes cause that entails hacking the rear apron and other barbarities. I had the local muffler boys weld up brackets and bend tail pipes, one on the left and one on the right. So it kind of looks stock with the tail pipe exiting to the side/rear, only I have two tail pipes instead of one.

Perhaps this is a bad idea and I'm totally ruining my engine or something, but it seems to be working OK. Just another option you may want to consider.

Guatebus

VWBobby · Posted: Tue Jan 31, 2006 8:32 am Post subject:

It can also harm the engine. It builds a lot of heat in the heads when you have a restrictive exhaust. Combine the restriction with the fact you are pushing a 2200lb loaf up a hill, and the engine is not happy. Of course most people aren't looking for performance in a bus, but at least research what you're doing.

pyrOman · Posted: Tue Jan 31, 2006 8:52 am Post subject:

guatebus · Posted: Tue Jan 31, 2006 10:56 am Post subject:

I don't have a photo or camera handy, so I used photo editor to hack up a photo someone posted in the gallery. My setup kind of looks like this:

Image may have been reduced in size. Click image to view fullscreen.

With the apron and bumper on you can pretty much only see the ends of the tail pipes.

- Guatebus

pyrOman · Posted: Tue Jan 31, 2006 11:21 am Post subject:

That is actually a pretty "trick" looking muffler! Razz

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15 windowdelux · Posted: Tue Jan 31, 2006 5:08 pm Post subject:

Heres another option using a stock bug muffler. Just weld a bend into the muffler and have it exit below the stock bumper.
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Andrew · Posted: Tue Jan 31, 2006 6:24 pm Post subject:

Personally, on a 1600 sp, I felt a noticeable difference between the stock muffler and a header. I didn't lose as much speed on hills with the header over the stock muffler. I ended up running stock, though, just because it was quieter with better ground clearance.

As for stock mufflers, though, you can usually pick them up at swap meets pretty cheap. The last one I got, I paid like $20 for at a swap.
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Split Decision · Posted: Wed Feb 01, 2006 8:20 am Post subject:

I thought that if you used anything that didn't exit out the side you risked sucking exhaust fumes back into the cabin/engine?
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On year seven of the "I'll get it done next week" engine rebuild.

Andrew · Posted: Wed Feb 01, 2006 9:26 am Post subject:

60vwnewengland · Posted: Thu Feb 02, 2006 6:29 am Post subject:

Mr. Bubblehead · Posted: Thu Feb 02, 2006 7:32 am Post subject:

Thanks for all the info. If I have to buy something (looks like I will) I think that I would prefer a header with a single or dual QP muffler. Can anyone recommend a good header to use, one that has heat risers on it for the carb? I also would like one that clears the apron, but I don't want the exhaust dragging on the ground. I currently have one of those EMPI 4-tip exhausts (came with the bus) and 1) it looks ugly, and 2) it is too close to the apron and has burned off all the paint.
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67jason · Posted: Thu Feb 02, 2006 7:37 am Post subject:


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