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b_r_u_t_o_n
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Joined: December 01, 2017
Posts: 4
Location: Boulder, CO
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 Posted: Thu Dec 14, 2017 8:03 am Post subject: Lining up Cat>Muffler>Tailpipe |
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Hi all,
1985. 1.9 GL Camper.
Put in a new catalytic, muffler, and tailpipe last night. I'm not sure I have the parts rotated/aligned properly. Perhaps it's just a problem of "exact fit" not being an exact fit.
Parts are a Walker quiet flow ss muffler, magnaflow catalytic w/the plug for sensor, and tailpipe from Gowesty.
1. I'm having a pretty tough time getting the muffler strap bolt back through enough to bite and tighten. Can I just go get a longer bolt?
2. Tailpipe is angle up just a tad and ever so slightly protruding out. Is this a problem? Tailpipe also didn't line up bolt holes with mufflers so well, in all configurations I tried.
3. For the catalytic, I'm guessing the cat should be lined up so the plug is facing up.
They are connected so that O2 plug is upstream, the inlet arrow faces towards the cat.
Just wondering if this pretty common with aftermarket parts from the local parts store. Thanks all. Cheers! |
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dgbeatty
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Joined: October 26, 2006
Posts: 702
Location: Sacramento
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| Posted: Thu Dec 14, 2017 12:21 pm Post subject: Re: Lining up Cat>Muffler>Tailpipe |
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| If you could post some pictures it would help. |
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Vanagon Nut
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Joined: February 08, 2008
Posts: 10371
Location: Sunshine Coast B.C.
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| Posted: Thu Dec 14, 2017 1:20 pm Post subject: Re: Lining up Cat>Muffler>Tailpipe |
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| b_r_u_t_o_n wrote: |
Hi all,
1985. 1.9 GL Camper.
.....
Parts are a Walker quiet flow ss muffler, magnaflow catalytic w/the plug for sensor, and tailpipe from Gowesty.
1. I'm having a pretty tough time getting the muffler strap bolt back through enough to bite and tighten. Can I just go get a longer bolt?
2. Tailpipe is angle up just a tad and ever so slightly protruding out. Is this a problem? Tailpipe also didn't line up bolt holes with mufflers so well, in all configurations I tried.
3. For the catalytic, I'm guessing the cat should be lined up so the plug is facing up.
....
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It sounds like the muffler seam is interfering with the muffler brackets. Are you sure you have the muffler in correctly? i.e. inlet to cat? the muffler should have an arrow on it showing direction of flow. Unlike the 2.1 muffler, it appears the 1.9 inlet and outlet are the same distance away from the muffler body so.....
The Bentley image shows the tail pipe and inlet gaskets indexed at different positions.
It sounds like the cat O2 hole will be plugged but yes. That hole should be at around 1:00 looking from end of tail pipe. Look at Digifant exhaust pics in Bentley? I see the 1.9 has O2 further upstream at 2-1 manifold.
Neil.
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1981 Westy DIY 15º ABA
1988 West DIY 50º ABA
VE7TBN |
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djkeev
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Joined: September 30, 2007
Posts: 32591
Location: Reading Pennsylvania
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danfromsyr
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Joined: March 01, 2004
Posts: 15144
Location: Syracuse, NY
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| Posted: Thu Dec 14, 2017 2:46 pm Post subject: Re: Lining up Cat>Muffler>Tailpipe |
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put it all together loose 1st don't cinch down anything till it's all in place..
then methodically clamp it all tight..
what goes 1st and what goes last is dependent of each individual mousetrap.. so you'll have to watch as you tighten.
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regis101
Samba Member
Joined: July 28, 2005
Posts: 2078
Location: Livermore, Ca
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| Posted: Thu Dec 14, 2017 3:27 pm Post subject: Re: Lining up Cat>Muffler>Tailpipe |
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Cat. I had tried one of the Magnaflow CA zippy do Cats. The two end flanges were not even close to being parallel with each other. It made the muffler wow into the hangar. Returned it. Sourced a real CA Cat and all is well.
Muffler. Stock is ~5" diameter. Measure your aftermarket to compare. Otherwise it may not sit in the saddle correctly. Could be the reason you want to use a longer bolt.
Muffler. The tail pipe end has the threaded holes. Installing backwards may create fitment probs.
Just some past observations. YMMV
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Peace, Regis |
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b_r_u_t_o_n
Samba Member
Joined: December 01, 2017
Posts: 4
Location: Boulder, CO
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| Posted: Thu Dec 14, 2017 3:49 pm Post subject: Re: Lining up Cat>Muffler>Tailpipe |
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Thanks guys,
The muffler is slightly larger in diameter, just enough to where it doesn't want to seat well with the upper part of the strap. Went with a 50mm bolt and was able to get it to grab and bring the muffler up.
Yes, the muffler was mounted with the inlet at the cat and the threaded end for the tailpipe.
I'm still not exactly thrilled about how the tailpipe is landing. But now that it snowed and cooled off in Colorado; I'm going to come back to it when we get a few warm days. Although doesn't seem much for options to rotate it any other way.
Yep, O2 is upstream from the cat, but this is how they're built now? Being to work with all models. At least Van-Cafe describes it that way.
BTW, how far away from tail should I be feeling the pressure or wind coming from the tailpipe? Engine runs a little rough which I'm working my way through, but thought maybe since I can feel the exhaust a few feet away it may be an indicator of something? |
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Vanagon Nut
Samba Member
Joined: February 08, 2008
Posts: 10371
Location: Sunshine Coast B.C.
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| Posted: Thu Dec 14, 2017 9:20 pm Post subject: Re: Lining up Cat>Muffler>Tailpipe |
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| b_r_u_t_o_n wrote: |
Yes, the muffler was mounted with the inlet at the cat and the threaded end for the tailpipe.
I'm still not exactly thrilled about how the tailpipe is landing..... Although doesn't seem much for options to rotate it any other way.
Yep, O2 is upstream from the cat, but this is how they're built now? Being to work with all models. At least Van-Cafe describes it that way.
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Ha. Oops. My bad. Forgot that flange for tail pipe is threaded! Makes muffler install pretty obvious.
Ya I was just referring to the Bentley Digijet exhaust diagram. It shows the factory position of O2 sensor upstream of cat in the WBX 2-1 J pipe.
If you "exhaust" all options to correct the tailpipe position, maybe cut it, mark where you want it, take it to an exhaust shop to have it welded? I bet it would cost very little. And I think that WBX tail pipes wear out before the muffler so I doubt it'll ever need to be installed on a new muffler.
Neil.
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1981 Westy DIY 15º ABA
1988 West DIY 50º ABA
VE7TBN |
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