[Tennessee Tim]

patty442:

Yes, I got the article. Thanks so much. It's truly incredible.

I have learned that the use of an O2 sensor is only one tool and nowhere near as helpful as it is for tuning EFI. It is virtually useless for idle and progression, particularly with a cam with a lot of overlap. It will typically show too ruch, even when actual combustion chamber conditions are too lean. It can be very helpful in tuning the main circuit, though, at least help to make sure that conditions aren't dangerously lean. I intend to revise the tutorial to reflect the good and bad of using a wideband sensor based on my experience. What I am finding is that the "old school" techniques (plug cuts, sniff test, "butt dyno", etc.) seem to be the most effective when combined with some knowledge of how the carbs and their components work.

I would be delighted to participate in a conference call to discuss further. I think you have my e-mail. If not, you can use the e-mail feature here to drop me a line.

Thanks for your comments.

Tim