Wesley Scott wrote: > Connect the input to an o-scope. Remember the coil and capacitor act as an > oscillator. If the spark plugs are not easy to fire (possibly gapped too > wide or fouled), there will be multiple peaks in the voltage. It is a > design feature, if the plug doesn't fire on the first peak, it might fire on > the second, third, etc.
My plugs are brand new and are properly gapped, and I'm using some of the best plug wires money can buy. The Tiny Tach guy is at the end of his rope trying to figure out why it won't work with my engine. I'd think it would be easy to make it read accurately, since the pickup is inductive, in the form of a solid copper wire that wraps around ONE plug wire, and I have it installed several inches away from any other plug wire. The ratio of spark signal to noise should be huge, so therefore easy to separate. He had me build a resistive network to get the second unit to work (and I even incorporated a potentiometer so I could cover the whole range of possibilities) and it would either work erratically or shut down entirely and go back to hour meter mode. The third one is something he calls the "X" which has some sort of filtering in it. Same results as before...totally erratic. I give up on it... Mark Langford, Huntsville, Alabama N56ML "at" hiwaay.net see KR2S project at http://home.hiwaay.net/~langford
