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GT6 GT6 stromberg carb question

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pei

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I am trying to finish tuning my emmission control strombergs. I have them balanced and linkage and idle set and the car is running and starting well. Here is the question. I have no access to an analyzer to set the final adjustment screws on the carbs. Will a colortune device work instead of the exhaust analyzer?
Regards
Joe
1970 GT6+
 
pei said:
Will a colortune device work instead of the exhaust analyzer?
Click to expand...
Not entirely, but it will probably get you pretty close, all other things being equal.

If you use the Colourtune to properly tune to a range of throttle openings (as the instructions indicate) I would assume you would meet the emissions spec (such as it was) for a 1970 vehicle. If you need to get through emission tests, maybe you might want lean it out just a tad for the test.

Do you have to test emissions in PEI for that age vehicle? Were there any specs back in 1970? At the time I thought emissions control consisted of a PCV valve and non-breathing oil filler cap.
 
Thanks Ross,
There are no tests here, But the carbs for this year have fixed jets. The idle trimming screw needs to be set with an exhaust gas analyser( according to BL manual.) I will try the color tune and see if it makes a difference.

The emmission control consists of a control valve on the inlet manifold and a carbon canister.
 
Aha. In that case I think Colourtune (or Colortune) will do the job. I have been pleased with the result. Handier for you I suppose if you had two colortune tubes, since you're going to get some variation between cylinders. You'll have to fiddle with it a bit probably but it does work.

FYI, there's a pretty good reference for rebuild and tuning ZS's by Nelson Riedel at https://web.archive.org/web/20040327211401/www.buckeyetriumphs.org/

Cheers.
 
That does look interesting, especially the changing from fixed to adjustable needles. Triumph made this change on the 73 models.
I will try the colortune and see how it works.

Regards
Joe
 
I've two and wouldn't give 'em up!
 
Emissions testing? We don't have that stuff in Alberta.
I set my twin ZS's via color of the spark plugs, a slow method perhaps since it's trial and error but quite accurate (at least I think so)
 
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