Electronic ignition voltage

Luv2flygassers · 02-11-2007, 08:43 PM

I'm new to the gas engine arena.......I just bought a CHI ignition system for my 31cc Ryobi, will a 6 volt battery give a hotter spark than a 4.8v battery?

Marc

Freddy Warbird · 02-11-2007, 08:53 PM

Can the CHI ignition tolerate a 5 cell pack? If it can, I would believe it would provide a more robust spark..

TKG · 02-12-2007, 09:31 PM

With a 31cc Ryobi you don't need to worry about a hotter spark.... The CH on 4.8v will run over 10,000RPM

Luv2flygassers · 02-13-2007, 07:42 AM

Thanks Terry........My unit has the syncro spark built in. How can I be sure that it is actually retarding the timing at idle. I'm still trying to get the engine to idle slower that 2300 rpm. (ideally about 1900-2000) Any suggestions would be greatly appreciated.

Marc

TKG · 02-13-2007, 10:43 AM

A. Put a CH ignition without the SS on the engine and check RPM
b. Use a timing light and some marks on the prop hub.

Luv2flygassers · 02-15-2007, 06:20 PM

At what voltage will I see a performance issue? Would 4.5v be enough to run the ignition? Just curious as to how critical I need to watch the voltage.

Thanks,
Marc

TKG · 02-15-2007, 08:49 PM

As the battery gets low the ignition will start to miss at WOT. If you ignore the miss it will get worse and then the engine will get real quite.
Charge before 4.4v

Luv2flygassers · 02-16-2007, 07:02 AM

Great info........sorry for so many questions. I bought the unit from one of the engine manufactures and didn't get any documentation. I had to go to the CH website to download instructions. I'm sure that I'll have more questions as time goes on.

thanks for your timely response,
Marc

Luv2flygassers · 02-16-2007, 07:05 AM

In response to the timing light, we did that but couldn't get the timing light to work...after we put everything up we realized that the high tension lead has quite a bit of shielding which probably fouled up our testing.

Marc

SparkyEE · 02-16-2007, 08:44 AM

Curious, I spoke w/ Adam at BCMA. He suggested a 4 cell vs a 5 cell. Said the 5 cell would "just draw more current".

Dave

rceagle1a · 02-17-2007, 07:47 AM

The post below by TKG answers this much better than I did so I divert to his post for the reasoning for using a 4.8 volt pack instead of a 6v pack.

TKG · 02-17-2007, 11:21 AM

When we test the CH ignitions we use a 4.8v regulated power source, we also use a spark plug with the side electrode cut off. That is about a .125" gap. The ignition is run at 12,000 rpm and is expected to fire across that gap.

The spark voltage at the plug only goes as high as need to fire the gap. Once the arc starts there is no futher increase in voltage. It takes about 12kv to fire a plug in a running engine. The CH voltage can go to over 25kv, so there is enough reserve to fire a fouled plug.

Make you life simple use a 4cell pack, for our engines and the rpm turned, 6v gains nothing

02-11-2007, 08:43 PM	#1 (permalink)
Luv2flygassers Fly Hard and Fast! Join Date: Feb 2007 Location: Oviedo, Fl Age: 49 Posts: 15	Electronic ignition voltage I'm new to the gas engine arena.......I just bought a CHI ignition system for my 31cc Ryobi, will a 6 volt battery give a hotter spark than a 4.8v battery? Marc

02-11-2007, 08:53 PM	#2 (permalink)
Freddy Warbird She's a Bad Ass Sukhoi Pilot Join Date: May 2006 Location: California Posts: 947	Re: Electronic ignition voltage Can the CHI ignition tolerate a 5 cell pack? If it can, I would believe it would provide a more robust spark.. __________________

02-12-2007, 09:31 PM	#3 (permalink)
TKG Flyin' Around Join Date: Sep 2006 Location: Riverton WY Posts: 28	Re: Electronic ignition voltage With a 31cc Ryobi you don't need to worry about a hotter spark.... The CH on 4.8v will run over 10,000RPM

02-13-2007, 07:42 AM	#4 (permalink)
Luv2flygassers Fly Hard and Fast! Join Date: Feb 2007 Location: Oviedo, Fl Age: 49 Posts: 15	Re: Electronic ignition voltage Thanks Terry........My unit has the syncro spark built in. How can I be sure that it is actually retarding the timing at idle. I'm still trying to get the engine to idle slower that 2300 rpm. (ideally about 1900-2000) Any suggestions would be greatly appreciated. Marc

02-13-2007, 10:43 AM	#5 (permalink)
TKG Flyin' Around Join Date: Sep 2006 Location: Riverton WY Posts: 28	Re: Electronic ignition voltage A. Put a CH ignition without the SS on the engine and check RPM b. Use a timing light and some marks on the prop hub.


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02-15-2007, 06:20 PM	#6 (permalink)
Luv2flygassers Fly Hard and Fast! Join Date: Feb 2007 Location: Oviedo, Fl Age: 49 Posts: 15	Re: Electronic ignition voltage At what voltage will I see a performance issue? Would 4.5v be enough to run the ignition? Just curious as to how critical I need to watch the voltage. Thanks, Marc

02-15-2007, 08:49 PM	#7 (permalink)
TKG Flyin' Around Join Date: Sep 2006 Location: Riverton WY Posts: 28	Re: Electronic ignition voltage As the battery gets low the ignition will start to miss at WOT. If you ignore the miss it will get worse and then the engine will get real quite. Charge before 4.4v

02-16-2007, 07:02 AM	#8 (permalink)
Luv2flygassers Fly Hard and Fast! Join Date: Feb 2007 Location: Oviedo, Fl Age: 49 Posts: 15	Re: Electronic ignition voltage Great info........sorry for so many questions. I bought the unit from one of the engine manufactures and didn't get any documentation. I had to go to the CH website to download instructions. I'm sure that I'll have more questions as time goes on. thanks for your timely response, Marc

02-16-2007, 07:05 AM	#9 (permalink)
Luv2flygassers Fly Hard and Fast! Join Date: Feb 2007 Location: Oviedo, Fl Age: 49 Posts: 15	Re: Electronic ignition voltage In response to the timing light, we did that but couldn't get the timing light to work...after we put everything up we realized that the high tension lead has quite a bit of shielding which probably fouled up our testing. Marc

02-16-2007, 08:44 AM	#10 (permalink)
SparkyEE Flyin' Around Join Date: Feb 2007 Location: NH, USA Posts: 9	Re: Electronic ignition voltage Curious, I spoke w/ Adam at BCMA. He suggested a 4 cell vs a 5 cell. Said the 5 cell would "just draw more current". Dave

02-17-2007, 07:47 AM	#11 (permalink)
rceagle1a Uber Contributer Join Date: Jan 2007 Location: Newton Iowa, U.S.A Age: 34 Posts: 185 Awards Showcase Total Awards: 1	Re: Electronic ignition voltage The post below by TKG answers this much better than I did so I divert to his post for the reasoning for using a 4.8 volt pack instead of a 6v pack. Last edited by rceagle1a; 02-17-2007 at 02:48 PM. Reason: Post by TKG was the better answer.

02-17-2007, 11:21 AM	#12 (permalink)
TKG Flyin' Around Join Date: Sep 2006 Location: Riverton WY Posts: 28	Re: Electronic ignition voltage When we test the CH ignitions we use a 4.8v regulated power source, we also use a spark plug with the side electrode cut off. That is about a .125" gap. The ignition is run at 12,000 rpm and is expected to fire across that gap. The spark voltage at the plug only goes as high as need to fire the gap. Once the arc starts there is no futher increase in voltage. It takes about 12kv to fire a plug in a running engine. The CH voltage can go to over 25kv, so there is enough reserve to fire a fouled plug. Make you life simple use a 4cell pack, for our engines and the rpm turned, 6v gains nothing

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