Not in NY either if car is more than 25 YO.
----- Original Message -----
From: John F Sandhoff <sandhoff@csus.edu>
To: Jim Williams <jamesd_williams@yahoo.com>
Cc: <datsun-roadsters@autox.team.net>
Sent: Wednesday, August 16, 2000 2:12 PM
Subject: Re: Passing AZ emissions and carb adjustments
> I'm NOT an emissions expert (well, people standing behind my
> Mustang may disagree :-) ) but I'll add about a penny's worth anyway
>
> Jim writes:
> > Well I failed my first time through the AZ emissions
> > test, but not by much... Hyrocarbons were low and Co2
> > was good at high speed, but the Co2 failed at idle...
>
> I do not believe that this is a 'lean the car out' issue. Leaning
> the mixture affects hydrocarbons more than CO (I'm guessing you
> meant carbon monoxide, not carbon dioxide).
>
> By the way, it is possible to INCREASE your unburned hydrocarbon
> count by LEANING the mixture! My 1200 used to do that - it's called
> a 'lean burn' condition - not enough fuel for a complete burn, leaving
> behind unburned gas that goes out the tailpipe. That's why the 'lean
> burn' engines of a couple decades back had emissions problems
> (we'll avoid discussing stratification - an old idea that pops up now
> and again)
>
> > I had the timing at 0, dwell right on, idle at 1500,
> > and SU carbs leaned to a 1/4 turn from the top stop...
>
> That's a high idle. Good for testing, bad for driving.
>
> > Just want to confirm that the SUs lean out as the
> > mixture ring at the bottom of the carb compreses the
> > car adjustment spring and moves the nozzle upward...
>
> Yup. But if you're 1/4 turn (hmmm, one and a half 'flats') from
> full-on lean, your carbs are a bit out of whack. Typical setting is
> a full 2-3 turns. Are the needles set right (Shoulder flush with
> the piston body)? Do the jets look good (nice and round, not
> oval from wear)?
>
> > Can anyone tell me if there are leaner needles I can
> > purchase for leaner idle?
>
> High altitude needles. Keith Williams knows all about R-16 needles :-)
> If someone donates him a U-20 maybe he'll figure them out, too :-) :-)
>
> > Passing an emissions test for a 32 year old car is a
> > pain...
>
> Not in California any more :-) Sorry, I couldn't help it...
>
> -- John
> John F Sandhoff sandhoff@csus.edu Sacramento, CA
>
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