Peter Bancks wrote: > I have a feeling that on a 6 cylinder distributor and coil powered unit the > tach should be set to 6 pulses per revolution, the three pulses setting > would be for a 6 cylinder coil pack setup where the plugs spark on the > exhaust stroke as well a-la motorcycle CDI unit.
Typical four stroke engines (such as cars and Corvairs) fire once per two revolutions of the crankshaft (one TDC is for compression stroke, the next one is for exhaust stroke), so a Corvair fires six times per two revolutions, (averages firing three times per revolution), so I have it set correctly for my engine type. I hooked up my Karmann Ghia's tach to it today and ascertained that both EIS and Tiny Tach are way out in the weeds. The Tiny Tach reads about 5000 rpm at idle, about 7000 at 2000 rpm, and then it goes back down to 5000 at 3000 rpm! The EIS is off by some wierd integer number, but it fluctates so much it's hard to guess what it is. The Ghia tach got me through the day of testing though (yes, I know I have to multiply by .67), and I proved that it's putting out good power and with a good mixture. I also found out my oil cooler leaks. Mark Langford, Huntsville, Alabama N56ML "at" hiwaay.net see KR2S project at http://home.hiwaay.net/~langford
