I'm trying to dial in the Weber 32/36 on my Slant 6, and decided it would be much easier to rig up an A/F ratio gauge. I've found some old discussions here and elsewhere about this, but I have one question I can't see answered.

Is there a wideband sensor that will screw into the stock O2 sensor location in the later Slant 6 exhaust manifold? Are these threads a standard size? I have a later manifold on my engine with an old rusty sensor still stuck in it, but I haven't attempted to remove it yet.

Of course this begs the question of whether this is even a good idea, or if it would be too hot for the wideband sensor. I've seen people suggest welding a bung in the exhaust pipe just after the manifold, and then using a heated sensor. I just figured it would be easier to skip the fabrication and use an unheated sensor in the stock manifold location, if possible.

If I can't use a wideband sensor in the existing manifold port, I'll probably just pick up one of these and install it at the recommended distance down the pipe.

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Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing

The AEM brand gauge I own has 18mm threads for the O2 sensor,not sure what the threads in your ex man are.

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V8?? We don't need no stink'n V8!!

I'm looking around the Bosch website to see what the threading is on their wideband sensors, but no luck so far. I may have to call someone up.

Alternatively, before I spend $200+, I could also just pick up a stock replacement O2 sensor and one of these. Not nearly as accurate, but probably good enough for my purposes. Do all narrow-band O2 sensors output the same voltage range? This gauge says it operates at 0-1.0 V.

I'm assuming that all Slant 6s with O2 sensors use the same sensor. Does anyone know if this is incorrect? A quick spot-check of RockAuto shows all the 225-powered Aspens and D-100s having the same options for sensors. I just need to figure out which vehicle to feed to the parts store.

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Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing

Narrow band sensors are useless for high-performance tuning. Don't waste your time.

All the wideband sensors I have used are standard 18mm threading. Weld-on bungs are widely available.

Where would you install the wideband sensor on a Slant 6, in the pipe just after the manifold? I somehow doubt that the stock O2 sensor was 18 mm.

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Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing

I would take out the Lambda sensor (narrow-band O2) and put the wide band O2 sensor in it's place. They are both M18x1.5 thread.

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Joshua

Great, that's good to know. Would there be any problems with overheating the wideband sensor, with it that close to the exhaust ports?

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Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing

If this is a permanent install then I would locate the sensor farther downstream, but if it's temporary on a normally aspirated engine I would use the stock location for convenience.

Here's a good reference for properly installing wide-band O2 sensors. http://www.wbo2.com/lsu/lsuinstal.pdf

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Joshua

Thanks for the info, I'm reading through it now.

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Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing

The cheapest O2 sensor which are the original 1 wire style have to be heated by the exhaust up by the exhaust to work right , the next generation had 2 wires,one for ground followed by 4 wire-the addition of a heater to keep the sensor active at idle.They all work on the 0 volt-lean -to 1 volt - rich. with .5 at 14.5 to one fuel air ratio. The newer cars run lamda sensors now .

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I may be slow,but I"m ahead of you.

A small note on the choice of bung for the sensor: Innovate now sell an extended bung (1 inch long) that is said to protect the sensor better, while retaining the measuring capabilities when using the short (1/2 inch) bung.

Olaf.

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Aspenized