While googling around for info on a piece I was writing about the California 1966-1970 NOx control retrofit mandate, I came across this very interesting company/product line:

http://www.neutronics.com/Current/retrosys.html
http://www.neutronics.com/Current/composite3a.html (too much info to load into one graph; no way to calibrate Y axis to quantify emission levels, but apparent reductions are probably real)

They tout the system as being applicable to vehicles originally equipped with 2-way (HC/CO) nonfeedback catalytic converters, but it also looks like just the ticket for cleaning up the exhaust of an oldie not originally equipped with a catalyst at all. Carburetors and catalysts don't play nicely without feedback mixture control of some kind.

Most gearheads don't care any more than they're legally required to about what comes out the tailpipe, but it really is much nicer to live with a car that isn't trying to gas you half to death with stinky exhaust every time you're stuck in traffic and the wind happens to shift the wrong way. It would not surprise me to see data showing this system can (very very slightly) improve fuel economy or at least not reduce it. And this CARB-approved retrofit system might be a way out of smog-check hell for those with '80s vehicles that won't pass smog but you can't get the factory-spec repair parts. I'm going to get in touch with the outfit and ask 'em some questions.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Interesting! I looked at the website and couldn't tell what the product actually was. For example, for 1975 year vehicles, does this product replace the carb? With what is the carb replaced? I would assume some sort of throttle body injection system. If so, do they include all the necessary fuel system upgrades? Does the system keep the carb? How? Does the system come with a new carb? Finally, price?

I am still slowly plugging away with adapting a Ford MAF based sequential fuel injection system to a slant six. Tis system will be 100% compatible with catalytic converters and would have open and closed loop feedback modes as well as EGR capability. I plan on keeping the EGR functional on my brother's Duster when I install this system.

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Casually looking for a Clifford hyperpak intake for cheap.

It doesn't replace the carb. On an engine without an air pump, it controls the oxygen content of the exhaust reaching the catalyst by admitting extra air to the intake manifold when necessary via an air inlet valve teed into the PCV hose. On an engine with an air pump, it never changes the mixture entering the engine; rather, it adds air to the exhaust stream as necessary via an extra air valve in the line from the air pump to the catalyst. The installation manual, downloadable from the site, is only 14 pages long (and some of those are taken up with "Tools you'll need" and other nonspecific info). Looks pretty simple.

Your MAF-based system will be far superior as far as engine operating efficiency -- please keep developing it!

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Whoops! I missed the download section. I downloaded the manual and get it now. Basically it is a computer controlled air valve.

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Casually looking for a Clifford hyperpak intake for cheap.

It will lean out a rich mixture by either adding air to the intake or exhaust.

Won't do anything if you're already lean.


But lean won't destroy a catalytic converter like rich can.......

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes