[T3] Speaking of T4 mufflers

[Jim Adney]

On 25 Jul 2018 at 22:02, Keith Park wrote:

> The last one I had on my T4 conversion exhausted out the middle and
> the tailpipe went right, I had the Lambda sensor on the upper rear
> corner of it.  This time Im using and Ernst, as Jake seemed to think
> they flow better, this exhausts out the right end, with a long
> resonator tube that goes back into the muffler. 
> 
> So where should I put the lambda sensor on THIS one?  I imagine things
> stagnate on the right end before it goes out so maybe the left end?? 

If the muffer's not yet on the engine, it might be worth probing the inlets with 
a long wire to see if you can see how it's plumbed inside. Remember that 
some Type 3 mufflers have internal plumbing that gives 4 equal length pipes 
and some don't. I wouldn't be surprised to learn that Type 4 mufflers were 
the same.

It seems likely that a well made Type 4 muffler would have an internal 
arrangement similar to a well made Type 3 muffler, with all 4 cylinders 
ending up equally in the middle. If your muffler has an internal damper that 
starts there, that's probably the best place to put your sensor.

Even if the inlets in your muffler all stop just inside where they enter the 
body, wouldn't somewhere near the start of the internal damper be the best 
place for a sensor, since that would have a fairly even mix of all 4 cylinders?

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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