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Exhaust gas analyser

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K2-K6:

--- Quote from: JezzaPeach on January 09, 2021, 08:54:44 PM ---Thanks Steve, I may have a tinker to see if it works on the pipe end. Wheeler dealers retro fitted one to a classic Honda car which partly prompted me wondering!

--- End quote ---

Was that the Civic they did in USA ?

JezzaPeach:
Yes I think so. A yellow one. I guess maybe a sensor needs to be nearer the manifold, but if it’s mainly for idle balance not sure if it would work at the pipe exit. Also may need to be “wide band” which appears to be 4 wire type, and there is a 2 wire type.

K2-K6:
I think they are just placed at front end on cars because that's where the cats are, so looking after mixture as close to cat as possible.

Some have used them at pipe end to give themselves reading as you ask (can't immediately find link to one) but seem to work.

Have you got a particular requirement to observe idle mixture? as most carburettor setups don't need it when set correctly. That's ordinarily if you're running a std setup for intake etc.

The Honda idle setup routine does effectively do this though (target mixture) if carried out correctly,  but by observation rather than outright measurement. It's an interesting little routine that's in their manuals as it effectively does what a fuel injection system adopts in optimizing the idle mixture.

I've an old stand alone mechanic "gas tester" that works quite well as it firstly calibrates against ambient air, then reads out how the exhaust compares to that. Fairly effective for what it does,  but of course you've no way of checking and logging readings when under load and moving.

JezzaPeach:
Many thanks, I have a couple of rather sooty plugs, so I thought it would be interesting to compare. I have balanced the carbs using vacuum gauges so everything else seems pretty well in order. That’s interesting I’ll take a look at the manual on the idle settings, I have just used the standard 1 1/2 turns. Thanks again.

K2-K6:
I think it was Seamus? in here posted some figures for a 500 that were obtained via mot equipment, which showed quite significant variability from cylinder to cylinder. 

They are obviously pretty small volumes, with just small physical changes making quite a difference.  But I'd of thought the main mixture would be more likely to give you general plug colour variation which would not clean up fully when running at idle speed.

As mentioned above,  someone good and experienced with a dyno would be invaluable to give more in depth picture of what's happening, especially if you can log figures for each pipe.

Are the brass jets etc Keihin?

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