O2 Sensor in Riser
 

Anyone use one of these?

http://howellefi.com/gm-tbi-products...or-marine-use/

I like this as a more permanent solution then the spacer.

http://www.ebay.com/itm/310137061646...%3AMEBIDX%3AIT


Thoughts? Comments?

The problem with the first option is all the machining required. You not only by the part but then have to find someone or do the machining your self. What happens if the welds crack? Its a lot more repair time than just replacing a gasket as with the second option.

The second option is very simple and easy to install. I use that exact spacer and have also used the WAGS engineering piece. Both work great and I've been running them full time for 5 years. The spacer also keeps the sensor farther from the water mixing location.

Hope this helps.

There is no welding in the first option. There is a hole drilled and tapped in the exhaust stream, then the bung is installed with an outer "set" nut and viton (or similar) o-ring to seal up the water. I do like the O2 sensor closer to the head with the spacer.

I am worried that my corsa diverters will no be so accommodating for the spacer. I thought about machining off some material from the riser and manifold to help with the rise but am uncertain until I get a better look.

What risers do you have? Installing bungs isn't hard work for a good TIG hand.

Factory risers

What is the thickness of the spacer? Im wondering if the spacer was machined at an angle if it would be easier to match up with existing exhaust.

That's good idea.

I'll look into that option since they are the same cost. Only have to use two more gaskets.

My friend installed that second spacer in his stock merc cast iron exhaust. He kept blowing 02 from moisture. The stock exhaust water dump is still relatively close to that joint, too close for an 02 if you want to run AFR all day.

On a side note I have bungs welded in my CMI tails, and I love them. The local welder did such a good job they look factory, pretty amazing and no issues with moisture.

Not true for all cases. As I stated I've been using those spacers for 5 years of year round boating with no issue from moisture. Excessive cam then it would be a problem with stock exhaust. I'm at 221/230 @ .050" , 114 LSA hyd roller small block, stock exhaust for reference.

I have a brand new Wags spacer never used for $60 shipped.

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