Timing advance curves

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20 Jul 2024 21:07 - 20 Jul 2024 21:16 #902405 by bneedy
Timing advance curves was created by bneedy
Can anybody tell me why there are two different curves in a timing advance graph in the manual? I can’t seem to find any answers to this in the forums. My apologies in advance if it’s already been explained somewhere. Any information is greatly appreciated.
Last edit: 20 Jul 2024 21:16 by bneedy. Reason: Image didn’t work
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21 Jul 2024 01:45 #902410 by zed1015
Replied by zed1015 on topic Timing advance curves
That chart doesn't really show two different curves.
It shows timing advance in relation to engine speed.
The right hand line is full advance approaching 2000 rpm and above.

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21 Jul 2024 02:20 #902411 by Wookie58
Replied by Wookie58 on topic Timing advance curves
Agreed, the area between the lines should be "shaded" for clarity. E.G.: the graph for my "K" shows an upper reading of 41.5 and a lower reading of 38.5 at full advance (factory spec is 40) this is in part due to manufacturing tolerances of all the components involved (bob weights, spring tension etc) All "mass produced" components have a "tolerance"
This is in part why modern engines of smaller capacity make more power, where ignition curves and fuelling can be "mapped" to get the best out of the motor.
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26 Jul 2024 14:50 - 26 Jul 2024 15:01 #902577 by bneedy
Replied by bneedy on topic Timing advance curves
Those curves are from a 1984 GPz 1100. It does not have a mechanical advancer. The advance is electronic within the igniter.
Last edit: 26 Jul 2024 15:01 by bneedy. Reason: Too many of the same attachment
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26 Jul 2024 16:23 #902581 by Wookie58
Replied by Wookie58 on topic Timing advance curves
There will still be manufacturing differences between the components involved (trigger, pick up coils etc) the area between the two lines represents "in spec"
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26 Jul 2024 17:46 #902583 by bneedy
Replied by bneedy on topic Timing advance curves
Thanks but I’d bet that has nothing to do with it. 
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26 Jul 2024 20:17 - 26 Jul 2024 20:19 #902584 by F64
Replied by F64 on topic Timing advance curves
Wozza and loudhvx answered this question in 2018 on this site.

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Last edit: 26 Jul 2024 20:19 by F64.
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26 Jul 2024 21:16 #902587 by bneedy
Replied by bneedy on topic Timing advance curves
This is why I typically don’t have anything to do with forums. You can ask a question and you never get an answer from somebody who actually knows what they’re talking about. It’s just a guess. Like this. And then there is the snark. Some keyboard warrior in the clique who’s got to prove you’re wrong. With a crayon. It’s a guess. You don’t know what you’re talking about. Nothing proves what you’re saying. Somebody else said it on the site. So what. Where is the proof? Again, it’s an electronic ignition. No mechanical parts. No wear and tear. It doesn’t happen when it’s electronic. If you don’t really know the answer, keep it to yourself.
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26 Jul 2024 21:16 #902588 by gd4now
Replied by gd4now on topic Timing advance curves
Just another example of a topic/issue/question that has been covered in the past here. The amount of info on site is a great resource when one can find it or it is pointed out by another member who has found it.

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26 Jul 2024 21:28 - 26 Jul 2024 21:39 #902589 by bneedy
Replied by bneedy on topic Timing advance curves
Just another post by a snarky guy whose opinion nobody really cares about and needs to get off the keyboard to go get drunk or something. I already said that I looked for it and couldn’t find it. And if I had, it would have been irrelevant to the question anyway. Have you ever noticed when you look at a curve on an electronic ignition today, there’s just one? Not two. Because it’s electronic. I don’t care if you can’t understand that. Go away.
Last edit: 26 Jul 2024 21:39 by bneedy.
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26 Jul 2024 21:58 - 26 Jul 2024 22:00 #902590 by DoctoRot
Replied by DoctoRot on topic Timing advance curves
Sounds like you’re projecting. No need to be a child. 

the tolerance in timing error doesn’t come from the electronic ignition. It comes from the accuracy of drilling the dowel pin that determines TDC in the end of the crank. The crank end  diameter is so small that even a couple thousandths difference can equate to a few degrees of timing error. I personally have found 1-2 degrees timing error on different cranks from the era. Nothing to do with the ignition system at all. 
Last edit: 26 Jul 2024 22:00 by DoctoRot.
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26 Jul 2024 22:04 - 26 Jul 2024 22:22 #902591 by bneedy
Replied by bneedy on topic Timing advance curves
I’m projecting? I’m a child? Look in the mirror. Why did you feel it was necessary to make this stupid arrogant pointless post? Another member of the old clique who felt it was extremely important to defend the status quo. Again, you prove my point. Just trying to make yourself appear intelligent and knowledgeable? Guess what? You failed. You’re not. Who is really the child here? It’s you. Grow up before it’s too late. Get over it. It’s ok. Really. And by the way, who asked you anyway? You really felt it was necessary to make this waste of everyone’s time post? Why? Get over yourself. Go do something useful. Watch TV. Go to bed.
Last edit: 26 Jul 2024 22:22 by bneedy.
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