Ignition advance

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Ignition advance

Postby ridenfly » Wed Apr 10, 2013 8:58 pm

Is there any difference for the total advance of the Ural ignition versus PowerArc? What is the total advance of the stock Ural? The recommended stock static advance is 4 deg. This is minimal compared to other bikes. I haven't been able to find any info on the stock or PA advance curve.
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Re: Ignition advance

Postby n3303j » Thu Apr 11, 2013 1:08 am

Not supposed to be.
PowerArc does provide two different advance curves.
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Re: Ignition advance

Postby ridenfly » Thu Apr 11, 2013 12:47 pm

I have a 2007 with PA and a 2004 stock ign. Can't really tell any difference but the 2004 is modified so a comparison is not apple to apple. I have switched to the supposed 'retarded" curve on the PA when climbing long steep grades ( wolf creek pass goes from 6500 to 10000 in 4 miles) and can't tell any difference.
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Re: Ignition advance

Postby Coluralado » Thu Apr 11, 2013 12:54 pm

Here is some info on the Ducati igntion.

The factory ignition (Ducati) has a working range of 4-18 degrees. At idle you will see the timing mark centered in the timing window, after 1800rpm the ignition will be full advance at 18 degrees.
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Re: Ignition advance

Postby ridenfly » Fri Apr 12, 2013 10:54 am

Thanks Derrell, I had seen that sometime but couldn't remember the numbers. Still wondering the difference of PA.
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Re: Ignition advance

Postby Msblu79 » Fri Apr 12, 2013 5:50 pm

I think the folks at Raceway did alot of testing for the PA manufacturer prior to offering them and might have some info on the PA specs they decided on. :foilhead:
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Re: Ignition advance

Postby rougaroo » Fri Apr 12, 2013 7:36 pm

The folks at PA will talk on the phone with you about any questions you may have. When I talked with them one time they said that the regular curve is "slightly more aggressive" than the Ducati advance curve and that the loaded curve is about 2 degrees retarded from that for running up long hills or running under a full load.

When people talk about an advance curve they aren't talking about a straight line, where it starts at 4 degrees and for each X number of rpms there are Y degrees of advance. Most advance curves are sloped, and it is that slope that makes the unique differences. So the PA regular curve may start and end at the same place that the Ducati advance curve does, but the "slightly more aggressive" means that the slope is slightly steeper.

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Re: Ignition advance

Postby ridenfly » Fri Apr 12, 2013 9:36 pm

To summarize from previous posts
4 deg BTDC at idle
18 deg max advance at 1800 rpm for stock
PA ad Ducati are same at full advance, 18 deg
PA has steeper slope. I assume this means it gets to full advance before 1800 rpm
One would assume that all the PA differences are below 1800 rpm.
Again, I don't remember exactly but 1800 in top gear is less than 25 mph.
I guess the reason I can't tell the difference between the two systems is I never ride at less than 1800 rpm in any gear.
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