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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Viperhead - How do I know?
02-11-2006 05:53 PM  12 years agoPost 1
bkervaski

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Birmingham, AL, USA

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I installed a viperhead this morning in my YS. It's already smoother as I swapped an MP2 for a Hatori as well.

My question is - how do I know the second plug has ignited? I 'touched' the second (cool/top) plug with my Radio South glow igniter and it lit up, but I didn't hear any change in the way the engine runs.

I'm just idling and maybe just a bit of throttle in my basement, haven't taken it to the field yet (cold today).

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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02-11-2006 06:04 PM  12 years agoPost 2
vince

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Victoria BC Canada

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I have one too... I heard it will light as soon as you start to spool up.

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02-11-2006 06:17 PM  12 years agoPost 3
bkervaski

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Birmingham, AL, USA

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Hrm.. but if I touch it with my glow igniter at idle, it should light and I should hear a difference in the idle, right? I'm assuming here and looking for someone who is familiar with the two glow plug setup to clarify.

The way I understand it, the dual-glow heads are like a poor man's turbo charger - burning fuel that is left in the head before the next cycle. So it should idle smoother??

I have an A3 in the angled position and an A5 in the center. I light the A3, right?

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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02-11-2006 07:46 PM  12 years agoPost 4
Spitfire_mk5

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Canada

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Its probably lighting off the second plug on its own at idle. You can feel/hear when the second plug lights the engine will start to idle a bit smoother. Give it time to get used to the note of the new muffler and head eventually you'll begin to know when the second one lights off. Its a rather subtle change in sound at idle.

As for starting I light the straight plug and just let the angled one fire on its own, but I doubt it really matters.

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02-11-2006 07:51 PM  12 years agoPost 5
Chris Lupa

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Lancaster, UK

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When you reach hover, both plugs will be fired up. As long as both plugs work, they will both be "on" when your in the hover. Obviously to check, just put you glow start to each plug and see if each one is drawing a current/lights up.

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02-11-2006 07:51 PM  12 years agoPost 6
AlanR8

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Saddleworth near Manchester (UK)

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Here's a tip. Only change ONE thing at a time! That way you know what the difference are.

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02-11-2006 07:54 PM  12 years agoPost 7
Drunk Monk

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Preston, UK

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You only need to light one plug, the engine will sound alittle rough until you rev it alittle, then you'll hear the second plug kick in and it'll get smoother.

You can sometimes tell when the second plug has blown as the engine runs rougher. If your engine has been running fine and suddenly it's not as smooth then check the plugs before you try to tune it out. I check mine every now and again, I found the main problem I had when a plug was blown was that it wouldn't rev back up after an auto and the engine would quit.


Stephen

I only open my mouth to change feet.....

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02-11-2006 09:29 PM  12 years agoPost 8
bkervaski

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Birmingham, AL, USA

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AlanR8 - yea, I know the drill, but weather has been bad and bordom just took over...

Thanks all for the feedback.

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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02-11-2006 09:35 PM  12 years agoPost 9
AlanR8

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Saddleworth near Manchester (UK)

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Tell me about the weather.....

Cold here in the UK, not NORWEGIAN cold but cold. Not flown for about a month.

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02-12-2006 10:45 AM  12 years agoPost 10
Drunk Monk

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Preston, UK

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Not flown for about a month.
You wuss I've been out flying with 2 coats, 2 jumpers, 2 pairs of pants on and still freezing my nuts off but having a blast. In this country you can't wait for the good weather or you'll never fly.


Stephen

I only open my mouth to change feet.....

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02-12-2006 10:51 AM  12 years agoPost 11
duc996bp

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Preston, UK

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See you later at the field then Steve!!!

John

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02-12-2006 11:15 AM  12 years agoPost 12
Drunk Monk

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Preston, UK

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lol I'm working today but chris and steve will be down there if the rain keeps away


Stephen

I only open my mouth to change feet.....

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02-12-2006 04:22 PM  12 years agoPost 13
vince

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Victoria BC Canada

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hmm... I always lite the centre.
I also thought the idea was to run more fuel through them then a single glow plug head.
The thing I noticed when running the viper was there was way more bottom end and mid range torque also a little more on the top.
2 stroke nitro engines run best at there designed rpm. The slower they turn the richer they run thats why they came out with a hover needle to clean up the lower rpm. Dual plug heads can burn more of that fuel... more torgue if more fuel is there.
Maybe your mixture is to lean if you can not hear a diffence.
as for checking the plug once and a while... the plug is the only thing that really tells you if your engine is getting the proper mixture.

sorry to get of topic

If the engine has less then 5 gallons on it this may not apply(new engines burn up plugs).
use a magnifier to inspect the plug, 2 to 4x is good enough.
If you look at a new plug you will see a nice shiny uniformed coil to the top plug.
as the plug burns up from abuse(lean mixture/overspeed)you will see the coil start to pit or lose its shiny coating. This coating is what gives the plug the ability to retain heat on the coil.
if the plug is frosted its way past the pitting stage.
if the coil is distorted and minor pitting its probably an OS8
This is what I see all the time(mostly planks), guys will have troubles with a glow engine the first thing they do is start cranking on the needle instead of looking at the plug first off.
If the plug has heavy pitting or is frosted the engine can not get enough fuel to run properly. so people will lean the engine out to make it idle and transition a little better with a damaged plug.
all this does is burn up the plug and the engine.
when the plug finally fails(can't retain any heat at all)people will just bolt a new plug at the same needle setting. well guess what the first time you open that throttle the plug is damaged.
If its someones plank at the field and I am tunning. I open the needle most of the time about 1/2 turn and work from there.
My Heli if its time for a new plug all the needles get opened a bit.
is it really that hard to open the needle.
Never open the needle with a frosted plug you will just put out the fire.

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02-12-2006 04:34 PM  12 years agoPost 14
bkervaski

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Birmingham, AL, USA

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When I light the cool plug to start the engine, then touch the hot plug with the glow igniter, there is a substantial difference in idle. I have been lighting the hot plug first, then the cool.

After doing this a few times I now have an ear for the difference and I've been able to ajust my idle to a very smooth, constant purr.

As soon as the weather gets above "nuts heading north" i'll get it to the field and check it out.

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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02-12-2006 05:55 PM  12 years agoPost 15
bobbyhill4x4

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Watertown NY

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Looking at the cycles of a glow engine the plug is charged on the combustion cycle which would mean the second plug should not have to be charged once the engine is started.

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