Joe Curry wrote:
>
> stu.jo@ibm.net wrote:
> >
> > Jane Burdekin wrote:
> > >
> > > Well folks, the GT6 failed emmissions again here in Colorado. What would
> > > make it passable (under 1000 hydrocarbons) at 2500 rpms, and fail at idle
> > > (923ish rpms)? I changed the spark plugs, and oil, added a quart of
>marvel
> > > mystery oil, and blew out the air filters. I would have had new air
> > > filters but the parts place is having operator error problems. If anyone
> > > has any suggestions let me know. Thanks, Jane
> > High hydrocarbons and low CO are due to a lean mixture and not a rich
> > one. I know that because I got my TR6 through by pulling out the choke a
> > tad.Co went up, HC came down
>
> I don't know how that would work, When I pull out my choke, I can see
> the carbon coming out the exhaust.
>
> Joe Curry '63 Spit
Joe, note I said a tad (thats two tenths of bugger all in plain
English). Enough to increase RPM by about 50.Obviously you can overdo
it, but high emissions are due to incomplete combustion, which can be
caused by a mixture being too lean or too rich.
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