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Old 08-07-2015, 08:37 PM   #1 (permalink)
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Default Catalytic Convert on a Carb engine

Hey I was wondering if getting a catalytic converter would help me not smelling like gasoline each time I drove my car. I wasn't sure if it was a carb thing or if it was because I was running no cat's.

this is my first car with no cats, so I wasn't sure if getting cat's would fix it. I have a friend with a Jeep with no cat's as well on a carb engine and he has the same problem.... but both of our car's came this way so we were not sure if this was common and typical symptom of running no cats.

Well anyways... I was quoted around 150bux to put cat's on, I wasn't sure if it would help or not. I drive around with no doors so i can smell the fumes.
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Old 08-07-2015, 10:43 PM   #2 (permalink)
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If gasoline is what you're smelling, you most likely have a fuel system leak, and no, a catalytic converter is not going to help you.

I live in a country where there are no emission regulations, and most of the vehicles have no cats, I own two Suzukis, one fuel injected, the other carbureted, without cats from the factory, and there is no smell of gasoline - my family has also owned another six Suzukis, four with carbs, two injected, again, no cats, from the factory, and no smell of gasoline.

Find where the fuel is leaking & fix it and that will get rid of the smell.
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Old 08-08-2015, 04:31 AM   #3 (permalink)
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Are you smelling raw gasoline or that distinctive make-your-eyes-burn funk from the exhaust like it's running rich?
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Old 08-08-2015, 12:37 PM   #4 (permalink)
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ahhh problem solved!!! yeah it was a cat, it costs me 160 with labor to put it on.

its so weird.. this is the first time i ever driven my samurai without smelling like I just finished cutting the lawn.

i think the biggest problem is that i just run my samurai completely open.. so the smell is intense without cats.

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Old 08-08-2015, 02:59 PM   #5 (permalink)
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I'm glad you got it sorted, I have had that experience with older carb vehicles, Addition of a cat can help with that, HOWEVER if the vehicle is properly tuned, timed, valve lash within spec, good compression, absence of vac leaks or EGR issues, it should run pretty clean w/o a cat.

My Sami has EFI and I live in SD where there are no emissions testing and I put a cat on mine anyway, mostly because I figured it would quite it down a little more. I used to on occasion catch a whif, but faintly and rarely, with the cat its completely clean to the senses. If yours was smelling like it was and the cat cleaned it up than the cat is doing it's job but in effect it's a band-aid to what is probably a tuning issue that still exists. Running to rich or lean each has it's own consequences. If I had a carb equipped Sami right now I would install a side draft CV carb or a Weber/Dellorto because they are so tweak-able and fairly reliable once setup. IMHO a cat is never a bad idea on a street driven vehicle but more poking around might be a good idea. Right now i'm right on top of buying a mobile sniffer so I can see AF ratios in real time while driving/riding.

Oh yea, sweet looking Sami!
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