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Need help understanding timing


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46 minutes ago, Stanglover said:

 Do you have 15L? That is a very commonly used slot width. 30 degrees c/a + 6 initial = 36 total mechanical.

To find a slot width take the degree you are wanting and multiply it by .013  and then add .150 to account for the pin width.  So a 15L (30 degrees)  = 30 x .013 + .150 = .540 width.

 

Kilgon

 

 

"The only dumb question is the one not asked"

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Kind of a continuation of this thread. I bought this dizzy off of flea bay because of price and condition. It is supposed to be for a 1970 351C so I thought it would have the 10L/13L slots. It is a Ford reman dizzy, and the parts sure look good but it has the 13L/15L slots, and it is set to the 13L slot but the arm does have a plastic bushing inserted over it. Does this mean it was altered by Ford for the 20 degrees of advance instead of the 26 degrees? If anybody knows about this please let me know. Thanks!!

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7 hours ago, Kilgon said:

To find a slot width take the degree you are wanting and multiply it by .013  and then add .150 to account for the pin width.  So a 15L (30 degrees)  = 30 x .013 + .150 = .540 width.

 

So glad we have a mathematician amongst us!! Thanks Kilgon. That could be a great help to others........... and myself.

Geoff.

 I learn something new every day!

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1 hour ago, Omie01 said:

Kind of a continuation of this thread. I bought this dizzy off of flea bay because of price and condition. It is supposed to be for a 1970 351C so I thought it would have the 10L/13L slots. It is a Ford reman dizzy, and the parts sure look good but it has the 13L/15L slots, and it is set to the 13L slot but the arm does have a plastic bushing inserted over it. Does this mean it was altered by Ford for the 20 degrees of advance instead of the 26 degrees? If anybody knows about this please let me know. Thanks!!

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That piece of plastic looks pretty beat up unless it's just the way the picture make it look like. I too bought a dizzy that had the plastic sleeve and why I previously mentioned it might be a quick fix, but to be honest, I have no idea if it was a Ford thing or not. The problem with the sleeve is it does reduce the travel width, but it also acts on the other side, reducing the "at rest" position by the thickness of the plastic, if that makes sense.

If it does work as a travel restrictor, then the total would depend on the thickness of the tubing wall. I'm still not sure that makes any sense, but hopefully you and others get the idea.!

Geoff.

 I learn something new every day!

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It's just the way it looks, (bad camera). It is actually a very nice looking snap in sleeve. I do understand what you are saying. I have a good ignition/dizzy guy that set up my last one. I guess I will take it to him and have him go through it. Thanks for the input!

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