Summers on the way
Join Date: Nov 2008
Location: New Zealand
ignition timing what is it for a twinspark
Ok, doing some mantainence on my 156 as it was pinking/detonating sometimes (seldomly) at random times, so i ran alfaDiag and diagnossed a faulty in the RPM sensor. I ran a sensor check on the timing and found out that the advance was sitting at about 14deg but when reved it jumped to -35deg??? (yes that is a negative 35), the motor at the time was runnig smoothe had full power and wasn't detonation. what am i actually reading becasue im sure it cant be the advance?
when i do find the advance what should i expect it to be, and range between?
the last thing is that the mesuremt was fairly constant but there was a noticable pulse to the reading, is this normal or should it be a dead straigt line?. the pulse only varies +/-1 to 2 deg or so