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DNK
03-03-2007, 12:10 PM
Does any one know the size of the dist. roll pin??

https://i123.photobucket.com/albums/o316/donkelly23/Rollpin.png

tomshobby
03-03-2007, 01:01 PM
Just happened to have my dizzy laying next to my computer. Without taking it out it appears to be .9 long x .1875 dia.

I just got my dizzy back from Jeff at Advanced and there is a solid pin in it. I think it is the original pin.

DNK
03-03-2007, 02:08 PM
Thanks Tom. So it is not actually a roll pin but a solid metal rod?

TRMark
03-03-2007, 02:49 PM
My TR4 uses a dowel (solid) pin. Not a tension or roll pin. Really don't know why solid instead of a roll, can't be the torque involved. The lucas dizzy from my old alfa engine uses a dowel also. Someone around here probably knows the answer.

martx-5
03-03-2007, 04:00 PM
My guess is that the solid pins are cheaper. My personal preference would be a spring type roll pin.

DNK
03-03-2007, 04:02 PM
Art should I go with the roll pin???

DrEntropy
03-03-2007, 04:07 PM
The only reason I can think of is the roll pin may be subject to movement (compression) and embrittle over time, but I've seen both types used for this application. Old Bosch dizz I have in the 1750 Alfa has a roll pin. All the 25D dizzy's I have use a solid one. *shrug*

Bugeye58
03-03-2007, 04:14 PM
One of my GT6 dizzys' has a roll pin, the other has a solid pin. Take your pick, I guess.
Jeff

martx-5
03-04-2007, 08:41 AM
I like to use the roll pins for several reasons...

1. They are easy to find locally.
2. Since they are larger then the hole they were designed to be used in, if there is any wear in the hole, the roll pin will take up the gap.
3. I have never seen one fail when used to replace a non-heat treated solid pin.