If you want it to work reliably and cleanly,
my input would be to fuel inject it...
While carbs CAN work with converters,
injection gives much better control of the A/F mixture,
can listen to an 02 sensor, and will 'keep itself in tune' by
dynamically adjusting parameters way beyond what a carb
can sense.
Take a look at MegaSquirt or similar- it's not a ton of money,
and IF TUNED well, will emit less, run better, and probably make
at least as much, if not more, power.
You won't reach 'new car' levels of emission due to the head design,
but you'll get a lot closer than it was!
my '.02
Toby
-------------- Original message ----------------------
From: Ronnie Day <ronday@tlabgalaxy.net>
> > Greg Burrows
>
> > Ok, while I know that I don't drive the blaster that much (summers only),
> > there is no doubt that emissions-wise this is one dirty car (67 2000, big
>cam,
> > big carbs, high compression, ported head etc etc and no emission controls).
> I
> > was talking to my friend and performance guru last night, and with my rising
> > concerns about the environment I asked him about the performance detriment
>of
> > a catalytic converter. He said that adding one would result in virtually no
> > performance loss and would help clean up emissions. He said that it was a
>big
> > misconception that today's converters rob power, and that he laughs at those
> > "performance" people who say the first thing they are gonna do is remove the
> > cats. My exhaust is a 2 inch pipe running back to a dynomax turbo muffler
> > just behind the last x frame, then just over the rear axle and out. I am
> > thinking of adding a small cat between the two x frames to see what happens.
> > Has anyone else done any such thing?
>
> Greg,
>
> I'm not an engineer (although I often play one at work <grin>), but I doubt
> you'll accomplish what you want without a complete re-design of the intake,
> exhaust and ignition systems to work with the converter. For one thing they
> don't like leaded gas, and possibly octane boosters, and the amount of work
> and expense would be all of proportion with any reduction in emissions, if
> there actually was a reduction.
>
> Before I tried it I'd talk to an automotive engineering prof, preferably at
> a school with a Formula SAE program or something similar.
>
> FWIW,
> Ron
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