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  #11  
Old 25th August 2015
aswracing's Avatar
aswracing aswracing is offline
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Originally Posted by IXL2Relax View Post
My Craftsman Digital Timing Light (14066) has a 2/4 cycle button - the manual says to use the 2 cycle mode for DIS with wasted spark (DIS=Distributorless Ignition System) - So it must internally calculate how to ignore the extra firing signals...

It looks like Actron makes that equivalent model in a plastic case (Sears even sells it online) - I think the Actron CP7529 is the equivalent (See Actron model here: https://actron.com/sites/default/files/hr_pdf_16313.pdf - OpManual here: https://actron.com/sites/default/fil...lish_16313.pdf)
That's cool ... but how does it deal with the uneven firing interval? I mean, it's going to get two pulses at 315 degrees apart, and calculate the delay based on 360, so the delay will be wrong, then it'll get the next pulse 405 degrees later, again calculate the delay based on 360 and be wrong, ad inifinitum.
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  #12  
Old 25th August 2015
Tom Beckner Tom Beckner is offline
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Originally Posted by groovemeisterus View Post
Is there a thread on here that can explain in detail why such a timing light
should be set to "zero", when dynamic timing for "20 degrees BTDC" that
anyone would know about?
When the setback light is set to zero, and the light flashes, what you see is
what you get.

If you see two dots, and those dots are stamped in the flywheel to represent
20 degrees before top dead center, then you are at 20 BTDC.

Tom Beckner
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  #13  
Old 25th August 2015
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groovemeisterus groovemeisterus is offline
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Originally Posted by Tom Beckner View Post
When the setback light is set to zero, and the light flashes, what you see is

what you get.



If you see two dots, and those dots are stamped in the flywheel to represent

20 degrees before top dead center, then you are at 20 BTDC.



Tom Beckner

Thanks Tom
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  #14  
Old 25th August 2015
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Originally Posted by aswracing View Post
That's cool ... but how does it deal with the uneven firing interval? I mean, it's going to get two pulses at 315 degrees apart, and calculate the delay based on 360, so the delay will be wrong, then it'll get the next pulse 405 degrees later, again calculate the delay based on 360 and be wrong, ad inifinitum.
iNDUCTIVE TIMING light doesnt calculate anything

It flashes when induced by the secondary voltage
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  #15  
Old 25th August 2015
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Originally Posted by rocketmangb View Post
iNDUCTIVE TIMING light doesnt calculate anything

It flashes when induced by the secondary voltage
So you're saying dial-back lights aren't inductively triggered? Should I take a picture of mine?
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  #16  
Old 25th August 2015
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I see what you are saying now

Set at zero its ONLY usable at IDLE or basically 20 degrees BTDC

So IF you dial it back to TDC and record the dial back degrees you should have a baseline ?
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  #17  
Old 26th August 2015
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Originally Posted by aswracing View Post
That's cool ... but how does it deal with the uneven firing interval? I mean, it's going to get two pulses at 315 degrees apart, and calculate the delay based on 360, so the delay will be wrong, then it'll get the next pulse 405 degrees later, again calculate the delay based on 360 and be wrong, ad inifinitum.
I produced the following chart to help visualize the firing sequence & factors involved:

Since I can't find any actual documentation of how the latest digital timing lights (DTLs) are designed, I can only speculate from my own perspective...

The DTLs use microprocessor chips - so they can calculate things as well as measure & respond - therefore, I would suspect they might be able to distinquish between the WEAKER WASTED SPARK and the STRONGER EVENT SPARK to decide which is the compression stroke... I have to test my DTL to see if it actually works on the Sportster - If so, this may be the how answer...

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