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bluething
Samba Member
Joined: August 22, 2006
Posts: 31
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 Posted: Sun Aug 27, 2006 9:58 pm Post subject: stereo muffler ????? |
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my mechanic speaks of a "stereo muffler" for a bit extra horses, can somebody enlighten me?
or has he been smoking something illegal 
thanks
mike |
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Towel Rail
Horizontally Opposed
Joined: April 15, 2005
Posts: 4622
Location: SE CR IA US NA PE
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| Posted: Sun Aug 27, 2006 10:11 pm Post subject: |
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| Maybe an extractor with dual mufflers? That's the best I can come up with. It's less restrictive, but VW's seem to be more driveable with a little backpressure. |
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Ferretkona
Samba Member
Joined: December 03, 2005
Posts: 1306
Location: Columbia, CA
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| Posted: Sun Aug 27, 2006 10:31 pm Post subject: |
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| Maybe the exhaust of a 73? |
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FreakCitySF
Samba Member
Joined: June 08, 2004
Posts: 642
Location: San Francisco
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| Posted: Sun Aug 27, 2006 11:40 pm Post subject: |
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73 = stereo
74 = mono
dual exhaust?
what else could it be? |
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bluething
Samba Member
Joined: August 22, 2006
Posts: 31
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| Posted: Tue Aug 29, 2006 2:43 am Post subject: |
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ok!
so this is what he meant
is this right (stereo muffler)? |
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Towel Rail
Horizontally Opposed
Joined: April 15, 2005
Posts: 4622
Location: SE CR IA US NA PE
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| Posted: Tue Aug 29, 2006 6:34 am Post subject: |
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| Oh. Dual mufflers. The Thing Shop sells a system like that. |
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bciesq
Samba Member
Joined: April 13, 2005
Posts: 495
Location: Orlando, FL
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| Posted: Tue Aug 29, 2006 7:21 am Post subject: |
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The Thing Shop system has 1 and 2 on the same header/muffler and then 3 and 4 on a separate header/muffler. The two sides are uneven in operation because 3 and 4 fire in sequence but 1 and 2 don't.
I've been researching headers for a couple of weeks and I've never seen a 2/3 and 1/4 dual setup. What are the supposed advantages? I guess you would get more of an even operation as two sides would be firing in paired sequence, but I don't see how you would get any scavenging (the headers won't be of equal length, each header spends half the time with out exhaust flow), so I'm not getting the point.
I'd be interested to hear an explanation.
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'73 Thing -- making 45 mph exciting again. |
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bluething
Samba Member
Joined: August 22, 2006
Posts: 31
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| Posted: Tue Aug 29, 2006 7:40 am Post subject: |
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well my mechanic has worked on Things all his life and swears by it, so im going to go for it
worth a try i suppose  |
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bciesq
Samba Member
Joined: April 13, 2005
Posts: 495
Location: Orlando, FL
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| Posted: Tue Aug 29, 2006 8:07 am Post subject: |
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| bluething wrote: |
well my mechanic has worked on Things all his life and swears by it, so im going to go for it
worth a try i suppose |
Let us know how it goes -- I'm really curious to see the results. My concern is that on my Thing Shop system it is the "in sequence" 3/4 side that has the most vibration as opposed to the 1/2 side where the pulses are more spread out.
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bluething
Samba Member
Joined: August 22, 2006
Posts: 31
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| Posted: Tue Aug 29, 2006 8:09 am Post subject: |
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will do  |
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iltis74
Samba Member
Joined: November 20, 2003
Posts: 826
Location: Anchorage, AK
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| Posted: Tue Aug 29, 2006 7:59 pm Post subject: |
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| The firing "sequence" on the 1/2 side is the exact same as the 3/4 side, as far as I know. Guess I could be wrong? Likewise the grouping of 1/4 and 2/3 is essentially the same. Maybe he wants to keep the evens and the odds together, and get fancy keeping lengths the same, otherwise I just don't see the point of criss-crossing around. Be better to ask the performance crowd at this point, though they'll just tell you to get a merged header and be done with it. |
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bljones
Resident Wit
Joined: February 08, 2002
Posts: 2377
Location: ontario canada
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Ferretkona
Samba Member
Joined: December 03, 2005
Posts: 1306
Location: Columbia, CA
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| Posted: Tue Aug 29, 2006 8:22 pm Post subject: |
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bciesq
Samba Member
Joined: April 13, 2005
Posts: 495
Location: Orlando, FL
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| Posted: Tue Aug 29, 2006 10:11 pm Post subject: |
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| iltis74 wrote: |
| The firing "sequence" on the 1/2 side is the exact same as the 3/4 side, as far as I know. Guess I could be wrong? |
You're right. I was staring at the diagram and had a brain freeze (although my 3/4 side does run rougher on my car for some reason).
Now that I've thought about it, the functional difference between the Thing Shop system and this one is that the Thing Shop system has the cylinder with the shorter header in each pair firing before the cylinder with the longer header. The system in the diagram has the cylinder with the longer header firing first.
Brain freezes aside, I still don't understand how this system works better than a merged header.
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Towel Rail
Horizontally Opposed
Joined: April 15, 2005
Posts: 4622
Location: SE CR IA US NA PE
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| Posted: Tue Aug 29, 2006 10:23 pm Post subject: |
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| bciesq wrote: |
| Brain freezes aside, I still don't understand how this system works better than a merged header. |
It can't. I think the only reason for a dual muffler setup as shown above is for better ground clearance. I'm still voting for the extractor.  |
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bciesq
Samba Member
Joined: April 13, 2005
Posts: 495
Location: Orlando, FL
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| Posted: Wed Aug 30, 2006 4:06 am Post subject: |
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| Towel Rail wrote: |
| bciesq wrote: |
| Brain freezes aside, I still don't understand how this system works better than a merged header. |
It can't. I think the only reason for a dual muffler setup as shown above is for better ground clearance. I'm still voting for the extractor. |
Right. After looking at Bucko's military 181, I can see that the dual header has a practical purpose in allowing for (a) better ground clearance (b) hand cranking the engine (in addition to the hole in the bumper, military 181s have a hole in the rear breast tin and a special nut on the crank pulley) and (c) use of a trailer hitch. I don't think that I can include performance on that list.
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bluething
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Joined: August 22, 2006
Posts: 31
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Towel Rail
Horizontally Opposed
Joined: April 15, 2005
Posts: 4622
Location: SE CR IA US NA PE
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| Posted: Thu Aug 31, 2006 10:03 pm Post subject: |
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They should have re-tested the stock muffler with the new main jet.  |
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bluething
Samba Member
Joined: August 22, 2006
Posts: 31
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| Posted: Thu Aug 31, 2006 10:09 pm Post subject: |
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Hi Ya!
i can buy a stock muffler cheap, but was it a main jet?
got any pic's |
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