PeachParts Mercedes-Benz Forum - View Single Post

Jeremy5848 · #15 07-03-2009, 01:19 PM

Quote:

Originally Posted by KarTek

I would install the probe in the plug area where the EGR was but the tip really needs to extend at least 1/3 of the way into the exhaust stream for the most accurate reading.

It will create artificially low readings if it's stuck in the eddy currents in that little tube.

It might be possible to create a "deep well" plug that will let the probe mount deeper into the tube or possibly a longer version is available.

Failing that, it's really easy to drill and tap a hole in the right spot on the cast iron manifold.

Yeah, I am concerned about that. I like your idea of a "deep well" plug but the EGR take-off isn't even straight so it would take a lot of careful cutting and bending. Even with an extra-long probe it would be a challenge. What pressure would the seal have to withstand? NASA did something similar when they were building the Saturn 5 engine. Hmmmm . . .

I'll probably try it in the end of the EGR take-off just to see what the results are. As for making a hole in the exhaust manifold, I would be concerned about leaving chips for the turbo to find (grease on the tap, sure) unless I pull the thing apart, which I really don't want to do just now.