Dave Morris wrote: > Kewl! Is that EIS output a standard RS-232 signal that you just read into > Excel through the COM port?
You think THAT was cool, EIS data logging just told me what my problem is that I've been having for months! Check out http://home.hiwaay.net/~langford/corvair/eis_runs/ . #2 cylinder is just plain dropping off line at anything much over idle! My guess is sparkplug breakdown, but shear conjecture will be entertained. An EIS would be a valuable addition to WW's engine dyno/test stand, and I consider it (or something similar) indispensible in the panel. I called GRT today myself, and got the same word as Dan. I'll put a potentiometer on mine and dial it up till it's steady, and then let everybody know what it takes. The weather really stinks for the next few days though, so somebody else is welcome to beat me to it. You should've seen me looking like the Michelin man (several layers of clothes) in the cockpit trying to read the laptop, with no canopy installed. The canopy is connected to the forward deck, which was removed so I could goof around with stuff like thermocouple leads. I looked like a cold wet dog when it was over. I can tell you that P/R of 3, 5, 6, or 8 don't work on my engine. Actually, I've tried them all. Maybe with a new resistance value it'll do better. I have a Tiny Tach that I finally bludgeoned into working correctly by shielding the lead with grounded aluminum foil, validated by an optical prop tach, so I know the EIS is wrong now. The data run shown above peaked at 2700 rpm, but EIS showed 2200, if your mind is capable of instantaeous averaging, but then I was back to my "closest yet" P/R of 5. Other than that, I love the EIS! A nice improvement would be a USB port in place of the laptop though, so my memory stick could do that work with no user input or laptop required... Mark Langford, Huntsville, Alabama see homebuilt airplane at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net
