Exhaust Smell Fix?

My 1956 CJ makes me stink like exhaust when I drive it. The tailpipe exits behind the passenger side rear wheel to the side. It's tuned correctly as confirmed by my A/F ratio gauge using an O2 sensor in the exhaust manifold.
What if I put a small catalytic convertor in line? Would that work to clean up the smell? Can I run a converter with non-oxy fuel?

 

You think it is from the tailpipe exhaust??? You burning oil or what? Open body or enclosed cab? Is your exhaust getting caught in some turbulence and rolling back in?

Don't mean to be sounding "short" with my questions , but my short dual pipe, open body, V-6 doesn't make a noticeable stink. I know that's not comparing similar rigs, but your exhaust problem puzzles me.

 

Open top. Not taking your response as "short". I may be burning some oil but I drive it so little that it gets an oil change every spring when it comes out of the garage. It never is down at all on the stick. I get a little smoke when on the gas hard and when it starts up cold.
I don't see any smoke when cruising.
It seems to me that it's swirling up behind the Jeep.
I have all of my drivetrain vented up into cab behind the firewall. It doesn't smell like gear oil. Smells like if I was standing behind the pipe.

 

What roll bar spare carrier n such. My first Jeep was a 283 in a flatty and sometime depending wat was in the back I’d smell exhaust like your sayin. I had duals that exited right in front of the rear tires. I think it’s an airflow thing from the rear.

Just my 2 cents hope it helps

 

My V-6 has a single exhaust that exits out the passenger side behind the rear wheel. I don't smell exhaust while driving. Now in the garage before it warms up, Yes. (Doors open)

 

I've got a piece of 1/2" copper pipe mounted to the firewall with 3 nipples on it. There's an elbow on one end that goes in through the firewall and has a breather vent on it. The trans, t-case and front diff vent lines attach to the nipples on the pipe on the firewall.

Maybe I am burning a bunch of oil and that's what's causing my smell. It runs so good though and the A/F ratio gauge reads good at the manifold.

 

My tailpipe is flush with the side of the body. Do you guys have yours extending out passed the body at all and if so how far?

 

Your a/f gauge sensor may get gooped up by oil if in fact you are burning a lot of oil

 

Thanks. Looks like what I'm running.

 

With the windshield up, no top, my daughter complains that my '56 has an exhaust smell.

No smell at all when I run with the windshield down, as the jeep gods intended. Problem solved.

 

This^

 

My wife complains every time I drive my '78 f150 because of the "stinky old truck" smell. I know I have a leak in the drivers side header which probably makes a big difference. But, old vehicles always smell. It's the unburnt fuel heading straight out of the exhaust pipe.

A catalytic converter would help clean those smells up. Plus, the new ones dont really cause any restriction like the the old ones do. Try it and report back to us!

 

I’d be interested to hear about that as well

 

You could read through the Wikipedia page about catalytic convertors Catalytic converter - Wikipedia I expect you could fit a 2-way convertor and not need precise control of the mixture to keep it working. However, I also expect that these pre-81 2-way convertors need a flow of air in the exhaust (air injection) to function at all. There are modern convertors that don't need air injection, but I expect these are all 3-way types and may stop working unless you keep close control of the air-fuel mixture. Don't inow - maybe not. You could track the A/F and compare to how well your convertor is working. Convertors are not free - they have significant scrap value in the platinum (typical) catalyst.

 

I was also going to comment - thanks Howard for reminding me - the Jeep factory exhaust would have been designed to give the least possible fumes coming back to the occupants, esp. when running topless. I know the '70s era pipes would exit right at the rear corner, and the pipe end was shaped to deflect the stream downward. I drove plenty with surrey top or no top and did not notice much smell. No cat. Strange exhaust sound though - similar to what your compressed air nozzle makes.

The drawing above shows a funny rounded end on the pipe - maybe artistic license for the actual turned-down tip?

 

Another thought - air injection might be enough to get rid of the stink. That will lower the HCs in the exhaust, if it's really the stink and not the burning eyes that's the issue.