Pertronix magnet install

[mlc240z]

I just installed the Pertronix Ignition on my 1971 240z. I just wanted to check on one thing. Is it normal for the round magnet that goes on the lobed dizzy shaft to be a relatively 'loose' fit? I expected it to be tighter and more of a snap fit. It went on easily but I expected it to conform to the lobes and be 'locked' into the shaft rotation. Magnet was fully seated and not riding high. I was able to easily turn the shaft without moving the magnet, but after I replaced the rotor it seemed to move with the shaft.

Sound right?

[Bambikiller240]

I........ I was able to easily turn the shaft without moving the magnet, but after I replaced the rotor it seemed to move with the shaft.

Sound right?

Not sure I understand what you are saying. The magnet sleeve is supposed to move WITH the the shaft. If it didn't, it would be slipping around the shaft and it would be impossible for the Pertronix to fire at the proper time..

The magnet sleeve should slide onto the shaft and be in a fixed position when fully seated.

[mlc240z]

That's what I felt, but it only seemed to 'lock' to the shaft when I placed the rotor into position. I would have thought that it would be a tighter friction fit by itself without the clamping pressure of the rotor. While the shaft lobes have some wear, it didn't seem that bad. I was afraid the magnet was sized slightly too large for my year Z, and just wanted to see if anyone else ran into the same situation. She runs fine, definitely better than points, much smoother, no choke cold starts, and seems to be well worth the money.

I'll probably check with pertronix to verify.

Thanks

[Bambikiller240]

Well, I don't know how loose yours is, but mine is fairly tight.

Keep in mind that there is no contact between the magnets and the pick-up that senses the magnets (or anything else for that matter), thus no friction, or drag to cause the magnet sleeve to move about.

[mlc240z]

Had another distributor from a late 71/72, so I tried the magnet on that shaft. It fit nice and tight just the way it should. It's not a wear issue, there is a definite size difference on the early 71 distributor cam lobes.

So I swapped the shafts and reinstalled. Works the same (probably better at higher revs) but I have a little more peace of mind knowing that the fit is right.

Just a heads up if anyone is doing this install on an 70-early 71 Z.

Thanks for the info Carl