RE: Glow-Plugs Recommended By OS Engines  
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RE: Glow-Plugs Recommended By OS Engines - 3/1/2006 1:35:10 PM   
jaka


 

Posts: 4427
Joined: 12/11/2001
From: Upplands Vasby, SWEDEN
Status: offline 		Hi!
Dar...the reason manufacturer do this is Performance!
You can acctually have more performance from an engine if you choose the right glowplug for that engine/prop/rpm/fuel/elevation combination.
Let me take an example.
When I race in Q-500 pylon with my Webra .40 GT (Swedish Q-500 rules)I use a Rossi 3 glowplug which I think is the best plug for max rpm in that engine using 80/20 fuel, at sea level swinging a 10x6 prop at around 14000rpm. This plug is also what comes delivered from Webra but Webra calls it No 3.
But this is not the plug I would choose if I wanted the outmost reliability...then I would choose an Enya 3 or OS 8 glowplug and run the engine on 5% nitro.


Regards!
Jan K
Sweden

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(in reply to DarZeelon)
       Post #: 76

RE: Glow-Plugs Recommended By OS Engines - 3/1/2006 3:19:38 PM   
Turk1



Posts: 635
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: offline 		Dar, Im not against or in favor of any theory in this thread but on my little experience,my both TT42GP and SK50 ABC got significant better run when shifted to A3 from OS#8.Better,reliable idling, better transition and more power on full throttle.My fuel is no nitro 20% full castor self mix.I didnt feel any flight time change but didnt check specially also.

(in reply to Kostas1)
       Post #: 77

RE: Glow-Plugs Recommended By OS Engines - 3/1/2006 3:49:57 PM   
DarZeelon



Posts: 6983
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline
quote:

ORIGINAL: jaka

Hi!
Dar...the reason manufacturer does this is Performance!
You can actually have more performance from an engine if you choose the right glow-plug for that engine/prop/rpm/fuel/elevation combination.
Let me take an example.
When I race in Q-500 pylon with my Webra .40 GT (Swedish Q-500 rules)I use a Rossi 3 glow-plug which I think is the best plug for max rpm in that engine using 80/20 fuel, at sea level swinging a 10x6 prop at around 14,000rpm. This plug is also what comes delivered from Webra but Webra calls it No 3.
But this is not the plug I would choose if I wanted the utmost reliability...then I would choose an Enya 3 or OS 8 glow-plug and run the engine on 5% nitro.


Regards!
Jan K
Sweden


Jan,


I can argue with none of what you wrote in that post.

But it is all a matter of using a plug of the right heat range.

And there is no reason whatsoever to use a hotter glow-plug then the engine needs, for a properly timed ignition, at a stoichiometric fuel-air ratio.

That is, unless you need to run the engine richer than necessary, like during the break-in of this engine.

The OS-Japan glow plug page does state, the A3 is suitable for break-in of all glow engines.

...But after actual break-in is completed, there is absolutely no need, or advantage, to run the engine much richer than stoichiometric (only a small safety margin richer).
So using the correct heat plug is the preferable way to go.

And, BTW, the Enya equivalent of the OS #8 plug is their #4, not #3. The #3 is hotter.
I was also wrong for a while about this plug...

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(in reply to jaka)
       Post #: 78

RE: Glow-Plugs Recommended By OS Engines - 3/1/2006 5:37:53 PM   
jaka


 

Posts: 4427
Joined: 12/11/2001
From: Upplands Vasby, SWEDEN
Status: offline 		Hi!
Dar...correct plug??? Wrong plug???
There isn't such a word as a correct plug...better for a certain porpoise yes, but correct ...?!
Is there a correct car to buy too...?

Regards!
Jan K
Sweden




< Message edited by jaka -- 3/1/2006 5:44:14 PM >

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       Post #: 79

RE: Glow-Plugs Recommended By OS Engines - 3/1/2006 6:51:59 PM   
DarZeelon



Posts: 6983
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline
quote:

ORIGINAL: jaka

Hi!
Dar...correct plug??? Wrong plug???
There isn't such a word as a correct plug...better for a certain purpose yes, but correct ...?!
Is there a correct car to buy too...?

Regards!
Jan K
Sweden



You know exactly what I mean, Jan.

Too hot is wrong, too cold is also wrong!

The right plug has the correct heat range and the correct reach. Some engines need it with an idle-bar.
And no; it does not have to be of a certain make....

And as to cars; should someone buy a Lamborghini Diabolo as a family car, to take his wife and 4 kids in???

There is a wrong car.... a wrong plug too!


< Message edited by DarZeelon -- 3/1/2006 8:00:37 PM >

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RE: Glow-Plugs Recommended By OS Engines - 3/1/2006 7:39:48 PM   
Sport_Pilot



Posts: 7652
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline

< Message edited by Sport_Pilot -- 3/1/2006 8:11:21 PM >

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RE: Glow-Plugs Recommended By OS Engines - 3/1/2006 7:51:28 PM   
Kostas1



Posts: 1227
Joined: 12/19/2005
From: AthensAthens, GREECE
Status: offline 		What is a glowplug with an idle bar?

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       Post #: 82

RE: Glow-Plugs Recommended By OS Engines - 3/1/2006 8:05:17 PM   
DarZeelon



Posts: 6983
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline 		Take a look at these too, Kostas.

Some engines, mostly, but not exclusively, loop-scavenged, baffled-piston ones, need that idle-bar, to prevent the glow-element from being doused by raw fuel angled toward the plug.


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< Message edited by DarZeelon -- 3/1/2006 8:30:00 PM >

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RE: Glow-Plugs Recommended By OS Engines - 3/1/2006 8:15:29 PM   
Sport_Pilot



Posts: 7652
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline 		Sometimes high performance schnurle engines need them also. Sometimes the porting is more directional and the pulsing in the port runners causes a lot of fuel mist to land on the glow plug. Often this is a high nitro engine with a cold plug so the idle bar helps.

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RE: Glow-Plugs Recommended By OS Engines - 3/1/2006 8:28:24 PM   
DarZeelon



Posts: 6983
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline
quote:

ORIGINAL: Sport_Pilot

Sometimes high performance schnurle engines need them also. Sometimes the porting is more directional and the pulsing in the port runners causes a lot of fuel mist to land on the glow plug. Often this is a high nitro engine with a cold plug so the idle bar helps.


Hugh,


Some Schneurle engines need the idle-bar... MDS.

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RE: Glow-Plugs Recommended By OS Engines - 3/3/2006 2:07:48 PM   
downunder



Posts: 3170
Joined: 10/10/2002
From: Adelaide, AUSTRALIA
Status: offline 		I have a problem trying to figure out what plug to use in my latest engine which is a 61. Now according to the OS chart it needs an A5 (larger than 60 as in suitable for an OS 61/91FX...from their site) but if it'd been the tiniest bit smaller (a 60) I could have used a #8. But my big problem is that it's a twin plug head. So does each plug think it's in a 30 size engine? If so I'd have to use an A3. But if I use an A3 and it's too hot cos each plug thinks it's in a 60 then it'll detonate and cave in the piston crown and blow the head off...or worse still, might even distort the coil in the plugs

The other worry is I checked the compression and it's just under 8:1 which indicates it could be designed for high nitro but that's something I generally never use. Help me Dar!

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RE: Glow-Plugs Recommended By OS Engines - 3/3/2006 2:42:41 PM   
Sport_Pilot



Posts: 7652
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline 		I think there are some who put in a cold and hot plug in the twin plug heads? Or should I say one plug is normal for the engine and fuel, and the other is colder than normal. Twin plugs on ignition engines require more retarded timing. This is because the two flame fronts have less area to travel thus have less time to travel. So I would try one medium range idle bar plug (this is an older loop scavenged engine?) on one side and a cold non idle bar plug on the other, then play with nitro percentage to start with.

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RE: Glow-Plugs Recommended By OS Engines - 3/3/2006 2:43:18 PM   
DarZeelon



Posts: 6983
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline 		Brian,


Seriously, I would say to use two cold plugs, since there are two there anyway, for reliability.
If the cold plugs prove to be too cold (large RPM loss on glow-driver removal), change to medium heat plugs.

...You don't need my help for that, Brian, do you?

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MVVS - Jett - Nelson - Bolly - Mejzlik

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RE: Glow-Plugs Recommended By OS Engines - 3/3/2006 2:55:32 PM