O2 Sensor Location
 

Guys, I having my CMI tails setup for O2 bungs. I tried doing some searches but didn’t get anywhere.

What side are you installing O2 sensors? I’ve seen a couple people reference doing the odd bank but with a single plane intake #8 is the farthest away. Does it matter? I have twins so maybe even on one, odd on the other?

Either way, looks like I’ll need to have them inline with then water inlet. Not a lot of room. Pic below is pre-carb builds.

Thoughts? I’m headed out shortly to drop off pipes.

https://cimg9.ibsrv.net/gimg/www.off...a4f3caa1e.jpeg

Id do all four pipes then cap the ones you are not using, 2 to 3 inches aft of the jumper hose should be fine, orient them so they kind of face each other on each engine is what Id do,

Here is where I mounted mine. Sensors not installed in this picture but you can see where they go. These were installed by CMI. Sorry for the mess I was finishing this years engine install.
Good Luck

https://cimg9.ibsrv.net/gimg/www.off...6b5f191aff.jpg

I have mine at approximately 1 o'clock with the bung 1/4" off of the band. Mine have a 1" ring before by the band. It worked great on the dyno.
https://cimg2.ibsrv.net/gimg/www.off...1e6a1850d.jpeg
https://cimg2.ibsrv.net/gimg/www.off...8d767b9883.jpg

Got it. Much appreciated guys!

They’re marked 2.5 inches down from the jumpers.

Wish I had the room outboard. It’s really tight against the sides. Wrenching anywhere around that area is a major pain.

Hey Gary, off topic but did you still need an HP500 filter head?

No it would not fit in the space I had. I modified my HP bracket to mount the Merc std head and added a temp sender to it. I used the Hardin 7 plate oil cooler that mounts onto the flywheel cover. All very tight but turns out very clean.
Again before clean up and detailing.

https://cimg1.ibsrv.net/gimg/www.off...8711464b4e.jpg

Nice!

Mine took a whole different turn with locations on a lot of stuff. I made new brackets for everything on the backend. I have my filters vertical because there was no room at all with the monster oil cooler. End to end it’s about even with the inside of the header tubes.


https://cimg3.ibsrv.net/gimg/www.off...21127605b.jpeg

I hope it all fits back in the boat! Lol

Anyway, sorry to have hijacked my own thread. I dropped everything off at the fabricator this afternoon. I should have the pipes back Friday. I went ahead and had all four done.

Here is the location of mine (before putting the extender on). About 10 o'clock, odd bank. I would also plan ahead for installing a bung extender/heat sink such as this linked below just in case you need it. This cured my issues of having water short out my o2 and I was lucky enough the o2 cable still cleared the hatch.

Heat sink/extender: Innovative HBX-1


https://cimg8.ibsrv.net/gimg/www.off...c7d8f96c43.jpg