Hi gang.
I'm running a 6n dizzy on my PY lump, for the improved hall sensor. So far, I've not driven it but it idles up to temp and the fan kicks in & out. It hunts a bit when stone cold, but soon evens out (as I hear they often do). It's a happy engine, as it'll sit at 820rpm (ish) and when I pull the blue temp sensor it goes up to 1000 rpm - all good. AFR is showing 14.6 at idle when warm.
So as I just plonked the dizzy on and although it's running nicely I need to set the base timing before winding the boost up on't road.
Here's how my 6n dizzy looks (mainly so you can note the position on the adjusting slots.)
So I borrowed a snap-on strobe (which is how I know the RPM so accurately). Warmed her up & pulled the blue temp, revs raised. I set the scope to 5 degrees advance and the timing mark looks like this - RED arrow represents the mark, so you can see it. Small BLUE arrow represents roughly where the mark was at 5 degrees advanced with it running.
At this point, the car is running champion. If I start to move the dizzy round to force the mark to line up with the TDC indicator it starts off ok but by the time I get it to line up, the revs drop and it stalls. Summat ain't right.
I don't want to damage the engine on the road. I reckon either my TDC marker is wrong, or i've got a gash single bottom pulley but both look ok. The pulley can only go on one way. Anyway, i'm struggling to set the ignition timing meaningfully.
Is there another way to do it?
Am I doing something wrong?
What am I missing?
Does your 6n dizzy sit in the same orientation as mine at 5°?
Any help appreciated.
Ross.