[christofoo]

Heihetech,

Thanks for posting this. DCD sounds very interesting.

However, much earlier in this post you stated that emissions testing could be passed by deactivating or uninstalling DCD.

What I would like is a definitive answer whether it actually results in significantly higher emissions, regardless of regulations. Have you, or will you, put your invention on an emissions test dynamometer, compare it without DCD, and present the raw data?

Although there is extra oxygen reaching the cat during DCD operation, I wonder if it actually remains efficient - if the closed loop operation of the cylinders that are firing has the same properties as without DCD, then the cat may remain efficient. My understanding is the cat needs to get a small amount of HC/CO as reactants. This should occur if DCD works properly. But I need to see real-world proof.

I would even suggest that DCD should be programmed to be inactive for the first 120 seconds of operation, so that it doesn't slow down cat light-off. I would be further impressed with cold start-up emissions data with and without DCD.

I live in an area where smog is a problem. For example, in the summer, even when the air appears clear, the ground-level ozone affects me when I ride my bike around town. At times I have a chronic cough. Is that fair? Even if I were not personally affected, and only the old people suffered, would that be fair?

Even if you don't have problems with regulations, if DCD results in a tangible tail-pipe smog emission increase, I personally don't want it. And I personally don't want my neighbor to have it, and I would probably write my local legislators and ask them to outlaw it. Saving gas at the expense of others is selfish.

Although it may be an non-issue in areas geographically less prone to smog.

Thanks,
Chris