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rc interferrence - 1/3/2013 8:11 PM   
BATMAN-RCU


 

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Status: offline 		Can a loose spark plug cause rc cliches with 2.4 system. Engine is Zenowa 45 gas. I know it can with radio on 72 but not sure about 2.4. Appreciate any comments.
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RE: rc interferrence - 1/3/2013 9:09 PM   
ira d


 

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Status: offline 		Yes ingnition system can effect 2.4 systems the stray rf will sometimes get in receiver battery or servo wiring and cause glitching.

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RE: rc interferrence - 1/4/2013 5:26 AM   
eddieC



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Status: offline 		If you don't have one, I suggest a metal plug shield. Solder coax to it, then ground the coax to the engine. A quick fix.

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RE: rc interferrence - 1/4/2013 12:47 PM   
Rodney



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Status: offline 		2.4GHz sure can be effected by a spark ignition, I've seen one really bad case. While it is usually caused be a poor shielding on the spark plug or wire, circuitry inside the electronic ignition system can also cause this if it is not properly grounded/shielded or if you try to use the same battery for the ignition system as you use for the radio receiver/servos.

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RE: rc interferrence - 1/4/2013 6:24 PM   
BATMAN-RCU


 

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Status: offline 		[image][/image]Thanks for the input. Your suggestion makes sense re grounding. The standard Zenowa plug wire conector is not metal but a rubber insulated plug. This is not an ignition system. It is a magnito system, but I guess noise is noise that came from loose spark plug similar to a poor plug connector...sounds logical to me. Almost lost my giant scale P-51.[image][/image]

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RE: rc interferrence - 1/4/2013 6:39 PM   
eddieC



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Status: offline 		The sprinter I talked about was also a magneto. Make sue you get the correct size cap. After that, it was quick.

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RE: rc interferrence - 1/4/2013 10:47 PM   
BATMAN-RCU


 

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Status: offline 		Thanks again re magneto set up! Appreciate it. I'm convinced now that it was the loose plug that caused the problem. The plug was only hand tight. I had the cowl off to change a throttle servo. The plug had to be removed in order to get the cowling off..(tight fit)...I guess I forgot to tighten the plug before following flight. My bad! after all the years in this sport of giant warbirds. I guess we all get a bit brain dead every now and then. Thanks again

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RE: rc interferrence - 1/4/2013 11:02 PM   
Rodney



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Status: offline 		Another thing I should have mentioned; if you change spark plugs be sure to use a resistor plug (it will have an R in the part number) else you will almost be assured of interference.

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RE: rc interferrence - 1/12/2013 12:24 PM   
ZAGNUT



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Status: offline 		make no mistake, the ignition system on zenoah engines is CDI, not magneto.

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RE: rc interferrence - 1/12/2013 1:24 PM   
Rodney



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Status: offline 		My G23 is definitely a magneto, not CDI

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RE: rc interferrence - 1/12/2013 2:57 PM   
dirtybird


 

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Status: offline 		A Zenoah G 45 comes with a magneto ignition as well as all of Zenoah engines except the smallest one.

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RE: rc interferrence - 1/12/2013 3:41 PM   
ZAGNUT



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Status: offline 		the 23, 26, 45, 62 and 80 are all CDI. where they source the voltage to charge the capacitor makes no difference.

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RE: rc interferrence - 1/12/2013 8:45 PM   
eddieC



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Status: offline 		Zagnut, they've made both. I have 2 G-23s that are both magneto. AFAIK they are available both ways.

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RE: rc interferrence - 1/12/2013 8:55 PM   
BarracudaHockey



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Status: offline 		The new ones are EI, the older ones though probably still available are magneto

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RE: rc interferrence - 1/12/2013 9:06 PM   
ZAGNUT



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Status: offline 		you guys aren't getting it: "CDI" does not mean "battery powered ignition system"

the G-62 in the below photo is CDI:



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RE: rc interferrence - 1/12/2013 9:53 PM   
acerc



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Status: offline 		A typical CDI module consists of a small transformer, a charging circuit, a triggering circuit and a main capacitor. First, the system voltage is raised up to 400-600 volts by a transformer inside the CDI module. Then, the electric current flows to the charging circuit and charges the capacitor. The rectifier inside the charging circuit prevents capacitor discharge before the moment of ignition. When the triggering circuit receives triggering signals, the triggering circuit stops the operation of the charging circuit, allowing the capacitor to discharge its output rapidly to the low inductance ignition coil, which increases the 400-600 V capacitor discharge to up to 40 kV at the secondary winding at the spark plug. When there's no triggering signal, the charging circuit is re-connected to charge the capacitor.


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RE: rc interferrence - 1/12/2013 10:04 PM   
eddieC



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quote:

you guys aren't getting it: "CDI" does not mean "battery poweredignition system"

Believe me, I know the difference. 


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RE: rc interferrence - 1/13/2013 12:49 AM   
topspin


 

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quote:

ORIGINAL: eddieC

quote:

you guys aren't getting it: ''CDI'' does not mean ''battery poweredignition system''

Believe me, I know the difference. 


I might not be very good, but I am fun to watch!



I'm certain there are Magneto charged CDI on these engines but what I really like is your signature line. Wish I had thoght of it first....

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RE: rc interferrence - 1/13/2013 4:39 AM   
chuckk2


 

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Status: offline 		A magneto ignition system is different that an electronic ignition, but the HV "spark"  still exists.  Full size A/C use shielded ignition leads and even metal cased plugs.


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