I have read that leaner mixture means higher HC/lower CO. Are you running
too lean?
Also, you may be able to lower HC by retarding ignition.
And then there is the trick to add alcohol to the gas, but I don't
remember which emission this affects.
Ulix
On Fri, 29 Jan 1999, Rick/Carolyn wrote:
> Hi All,
>
> Well it that time again for jacque to be smoged and under the new smog
> laws she flunked. So here is my question.
>
> I'm high on HC 333 PPM, spec 230 ppm, at a Idle. Now if I understand
> emissions right, When HC are high CO isn't. They are inverse of each
> other. CO is kept low by increasing the firing temp. This will bring
> up the HC's. If I was to lower the firing temp, ie. lower temp range on
> the plugs, this would increase CO and decrease the HC's.
>
> Has anyone ever tried this?
>
> I'm only out by 100 PPM, that's not much, CO is way low. This is the
> way it works on Gas Turbine anyways.
>
> Engine has been reciently done on top, valves, timing chain, etc. Car
> is a 76 XJ12C. I don't want to get rid of the V12, this is what most
> garages recommend.
>
> TIA
>
> Rick
> --
> 52 MGTD,Sparky 74 MGB, B-tris 76 XJ12 Coupe, Jacque
> 60 Bugeye, Puddles 58 MGA Coupe, Ruby
> http://www.softcom.net/users/walters
> http://www.geocities.com/Heartland/Acres/4644
>
Ulix __/__,__ ___/__|\__
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'67 Sprite '74 X1/9
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