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rcexl tach for troubleshooting - 4/19/2012 4:48 AM   
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Status: offline 		I was reading an airplane review in one of the magazines and one of the pics showed an rcexl tach with a caption that said it could be used to troubleshoot ignition problems. Anyone know how?

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RE: rcexl tach for troubleshooting - 4/19/2012 5:39 AM   
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Status: offline 		If it doesn't show somewhere between 1500 and 10,000 rpms, your engine is not running and you should investigate why.

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RE: rcexl tach for troubleshooting - 4/19/2012 1:02 PM   
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RE: rcexl tach for troubleshooting - 4/19/2012 1:46 PM   
RCVFR


 

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Status: offline 		Maybe the one who made the statement knows how?


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RE: rcexl tach for troubleshooting - 4/19/2012 3:16 PM   
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RE: rcexl tach for troubleshooting - 4/19/2012 3:36 PM   
Turk1



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Status: offline 		My short experience, that tach doesnt work smooth. Sometimes displays for several seconds then goes crazy.Then begins to display again then goes mad.I dont know what all those means but you need luck to be able to catch the RPM when you throw a look at it.

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RE: rcexl tach for troubleshooting - 4/19/2012 3:37 PM   
pe reivers



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RE: rcexl tach for troubleshooting - 4/19/2012 5:34 PM   
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Status: offline 		The one I have works OK but you need to be in a dark room to read it.

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RE: rcexl tach for troubleshooting - 4/19/2012 6:31 PM   
pe reivers



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RE: rcexl tach for troubleshooting - 4/19/2012 8:44 PM   
Turk1



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Status: offline 		Send which one?RCEXL unit or tach?I will try to test some others from friends.

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RE: rcexl tach for troubleshooting - 4/19/2012 11:01 PM  1 votes
pe reivers



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Status: offline 		Turk1,
Try a tach from your friends and see if it's better or the cause is in your setup, then talk to the seller of the device about what to do. If the engine runs fine the Ignition seems OK.


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RE: rcexl tach for troubleshooting - 4/20/2012 12:06 AM   
rexbirk


 

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Status: offline 		RcExcel makes an ignition tester. I have used it and it seems to work.

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RE: rcexl tach for troubleshooting - 4/20/2012 12:07 AM   
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Status: offline 		About all one can do is use it to monitor the engine RPMs and if the RPMs change noticeably from what they have been showing, then you have a problem of some sort. Such as the engine was always turning 6,800 RPMs and now it suddenly only turns 5,200 RPMs, then what happened or changed just then?

Now with electronic tachs hooked up to a engine. I have noticed on some motorcycle or scooter engines, that when the tach starts behaving weird and displaying odd RPMs as you are riding along, that the spark plug boot or cable has come loose or worse the ignition coil is going bad. What happens with the modern engines is they use something like a COP system (coil on plug) for the ignition. This entails using a really small ignition coil and running a higher voltage through the primary windings to generate the high voltage to fire the spark on the spark plug. Something like 80 volts or more us used on these things to drive the coil with. The higher the coil drive voltage the smaller you can make the coil. Now the coil doesn't have to be placed on the spark plug, it can be separate too. But the same methods apply. 

What happens with the lower voltage COP systems, say using 80 volts or so, is when the spark plug boot comes loose or something, the spark gap increases a lot, causing the high voltage side of the coil to generate a huge voltage increase of a 100,000 volts or more. That causes the insulation on the secondary wire windings inside the coil to break down and short out. But it tends to be a delayed action with the lower voltage systems, so it is later before the coil goes bad as the windings short out more and more, even after you put the cable back on tight. With the higher voltage systems the coil burns out almost instantly. I remember BMW manuals stating to never pull a spark plug unit off the engine while it is running, or it will kill it immediately.

So anyway if the tach is any good and seems to be working OK, and then it suddenly goes bonkers you want to check your wire connections closely for loose ones. Hopefully it is the tach unit going bad instead.




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RE: rcexl tach for troubleshooting - 4/20/2012 3:03 AM   
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quote:

ORIGINAL: earlwb

About all one can do is use it to monitor the engine RPMs and if the RPMs change noticeably from what they have been showing, then you have a problem of some sort. Such as the engine was always turning 6,800 RPMs and now it suddenly only turns 5,200 RPMs, then what happened or changed just then?

Now with electronic tachs hooked up to a engine. I have noticed on some motorcycle or scooter engines, that when the tach starts behaving weird and displaying odd RPMs as you are riding along, that the spark plug boot or cable has come loose or worse the ignition coil is going bad. What happens with the modern engines is they use something like a COP system (coil on plug) for the ignition. This entails using a really small ignition coil and running a higher voltage through the primary windings to generate the high voltage to fire the spark on the spark plug. Something like 80 volts or more us used on these things to drive the coil with. The higher the coil drive voltage the smaller you can make the coil. Now the coil doesn't have to be placed on the spark plug, it can be separate too. But the same methods apply. 

What happens with the lower voltage COP systems, say using 80 volts or so, is when the spark plug boot comes loose or something, the spark gap increases a lot, causing the high voltage side of the coil to generate a huge voltage increase of a 100,000 volts or more. That causes the insulation on the secondary wire windings inside the coil to break down and short out. But it tends to be a delayed action with the lower voltage systems, so it is later before the coil goes bad as the windings short out more and more, even after you put the cable back on tight. With the higher voltage systems the coil burns out almost instantly. I remember BMW manuals stating to never pull a spark plug unit off the engine while it is running, or it will kill it immediately.

So anyway if the tach is any good and seems to be working OK, and then it suddenly goes bonkers you want to check your wire connections closely for loose ones. Hopefully it is the tach unit going bad instead.





Thanks Earl, that pretty much answers what I was looking for. My engine was running fairly well on the stand but before I could tune it to the point where I was going to fly it, started  
running erratic like the needles had changed, wouldn't accelerate properly, sounded like it was missing. This was without changing any settings, just doing it on it's own. The tach was indicating what seemed like proper rpm, but would cut out to zero intermittently and then back to normal. I will try a new ignition and see if that is it.


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RE: rcexl tach for troubleshooting - 4/20/2012 3:19 AM   
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Status: offline 		I have one like that. Very useful to tune your engine. As far as troubleshooting goes - not so much.
The only thing I can think of is that you can test your ignition sensor, when you turn the prop you should get some reaction on the display.



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RE: rcexl tach for troubleshooting - 4/20/2012 2:18 PM  1 votes
pe reivers



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Status: offline 		If the tach shows it, it probably is just the hall sensor. The tach is completely driven off the hall signal.
See the post of JediJodi on RCexl testing in the sticky gas beginners thread. I believe post #29. I also linked to it from my web page.


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RE: rcexl tach for troubleshooting - 4/25/2012 12:07 PM  1 votes
pe reivers



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Status: offline 		Here is a quote from the tachometer manual indicating the other check function:
"
If there is interference from the ignition system, tachometer displays 0 or arbitrary values, this can be check for ignition system RFI
"



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RE: rcexl tach for troubleshooting - 4/25/2012 1:41 PM   
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Status: offline 		That is what I was looking for, but I have not been able to locate a manual for it. Thanks.
quote:

ORIGINAL: pe reivers

Here is a quote from the tachometer manual indicating the other check function:
"
If there is interference from the ignition system, tachometer displays 0 or arbitrary values, this can be check for ignition system RFI
"





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RE: rcexl tach for troubleshooting - 4/25/2012 4:10 PM  1 votes
pe reivers



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Status: offline 		It's included with every new tachometer!



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RE: rcexl tach for troubleshooting - 4/25/2012 4:29 PM   
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Status: offline 		Thank you Pe,great info.

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RE: rcexl tach for troubleshooting - 4/25/2012 5:08 PM   
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Status: offline 		I must have bought the discount version because mine didn't have instructions! Thanks for posting this. I have printed them out.


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RE: rcexl tach for troubleshooting - 4/25/2012 5:15 PM   
pe reivers



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RE: rcexl tach for troubleshooting - 11/4/2012 9:29 AM   
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i have the newest version V2.1

when the Tach is connected i get NO SPARK at all!!!

but i do see some readings on the display as i rotate the shaft over the the hall sensor few times...

when i disconnect the Tach from the Y connector , i get a spark again...


any ideas??

thx in advance

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RE: rcexl tach for troubleshooting - 11/4/2012 7:58 PM   
pe reivers



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Status: offline 		Get a new tach.

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RE: rcexl tach for troubleshooting - 11/5/2012 10:48 AM   
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Status: offline 		just got a nice email from the HK seller that he will mail me a new TACH




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