I have stainless marine exhaust manifolds, that are water jacketed, is anyone using o2 sensors on similar setup and where?

posted a picture on another site.


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Very easy to do. Drill the hole, pinch the two pieces together and weld shut, weld bung, pressure test and done

On my stainless marine 3's I put o2 sensor on bottom side of the manifold close to a exhaust port where its NOT water jacketed per Tyler Crocketts advice. He tuned it on the dyno and I re-tuned it on the water and its never melted down, runs good so far (100 hours), Smitty

While back OSO member recommended this piece.

http://wagsengineering.com/products/...sensor-spacer/

Good for between riser and manifold configuration.

THX

Jeff Wagner builds some nice stuff and is very skilled, however, the manifold spacer shown is for use with STOCK mercruiser manifolds, NOT stainless marines, Smitty

That is a good alternative for stock risers.

Here is where I put them in my Stainless Marine manifolds. I marked ideal position and you can see where I actually put them so I could get a weld on the inside. I went through the water jacket and welded on both sides.

There is no need to weld them on the inside. As mentioned above, drill a hole through both pipes. Then put the rounded end of a ball pein hammer on the pipe. Hit it with another hammer so that the rounded edge of the hammer rolls the edges in toward the inner pipe. Ideally, you want that gap less than 1/8" so it's easier to weld the gap. Once the inner and outer pipes are close enough, then weld up the water passage between the two. Once that's done, simply place the bung on the outer pipe and weld it in place. You don't have to weld the inside since you already closed off the water passage. Before I weld the bung on I like to run some water though the riser to be sure it's sealed up.
In your risers, I would place them in the turn about 6" or so above where the manifold and riser meet.
Eddie

years back ihad a set of custon stainless marine risers made w/the bungs welded in.i think the were 15mm or something close.they resemble the risers that rookie posted.

thanks Eddie, need to do my lightnings...great help...Rob