I've decided to move the O2 sensor down stream, maybe as far as where it Ys together.

I do have an 'ear' that could use some building up though, so thanks for your post.

Other than differing expansion rates, I have no idea about the metalurgy, and hadn't even thought about it. Thanks for pointing it out. Once upon a time, some 25 years ago, I knew there was a 'sweet spot' for sensor placement, but only remembered having seen 80s vehicles with the sensor located at t...

I was rather hoping to install the O2 sensor in the manifold to put it up stream of any leaks in the coupler, which it is very prone to. I was thinking maybe since it's just buildup and not trying to hold the cast together, that it would make it more doable than trying to repair a cast manifold. Tha...

Hi all, I'm looking to add an oxygen sensor to a 1970s cast iron exhaust manifold and would like to build up some thickness for machining. Considering thermal expansion differences, would it be prudent to use either silicon bronze or aluminum bronze for tig brazing?

Thanks in advance.

Chris

Thanks for the welcome, Mike.

And thanks to Josh and Coldman for your replies. Nice to know I'm at least on the right track, just need to practice a bit more.

Chris

Hi all, I'm trying to TIG braze steel to a cast/nodular iron housing using aluminum bronze like Jody did here: https://www.youtube.com/watch?v=xQN_yz-4Hhg&t=186s I V ground both my test piece of 3/8" steel strap (about 1-1.5" wide) and the cast, and preheated. After about 50 medium str...