2 plugs are better than one?  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> 2 plugs are better than one?
Page: [1]

Login
Message << Older Topic   Newer Topic >>
2 plugs are better than one? - 1/19/2008 10:29:49 PM   
geminitool


 

Posts: 50
Joined: 2/4/2004
From: bumpus mills, TN, USA
Status: offline 		I have a big glow engine and what i have done is machine a cylinder head with 3 glow plugs. Has anyone done this? pros/cons.
The engine runs great. no loading up runs on any fuel and very relible. It made that sloppy midrange run like it has an after burner. Im running a 20 x 8 prop
       Post #: 1

RE: 2 plugs are better than one? - 1/19/2008 11:21:26 PM   
jessiej



Posts: 1803
Joined: 7/6/2003
From: STATESBORO, GA, USA
Status: offline 		Interesting. I an aware of several engines that have been manufactured in the past with dual plugs but nine with three.

What kind of engine is it?

jess

(in reply to geminitool)
       Post #: 2

RE: 2 plugs are better than one? - 1/19/2008 11:26:09 PM   
Flyer95


 

Posts: 978
Joined: 9/21/2004
From: STOCKHOLM Akersberga, SWEDEN
Status: offline 		Thats why I like the OS-F glow plug so much for any twostroke engine bigger than a 91. The plug clears the midrange and makes it easy to set the needles rich for a nice thick smoke trail Maybe 2 or 3 glow plugs have effects in the same direction as one really hot glow plug or maybe even better? Have you gained any top rpm compared to a single plug operation?

(in reply to geminitool)
       Post #: 3

RE: 2 plugs are better than one? - 1/20/2008 12:25:13 AM   
MOTORMAN37



Posts: 2091
Joined: 10/26/2002
From: CLINTONVILLE, WI, USA
Status: online 		I have seen many Giant scale air racing glow engines where they had more than two glowplugs. But these were some pretty big glow engines. 200 CC quadra's all the way up to 280CC modded Herbransons. Were taling about 40 HP with these.

(in reply to Flyer95)
       Post #: 4

RE: 2 plugs are better than one? - 1/20/2008 12:28:21 AM   
Hobbsy



Posts: 10683
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		Why not tell us the engine make, size of engine, fuel used and top rpm plus idle speed.

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to geminitool)
       Post #: 5

RE: 2 plugs are better than one? - 1/20/2008 1:25:45 AM   
geminitool


 

Posts: 50
Joined: 2/4/2004
From: bumpus mills, TN, USA
Status: offline 		Its hard to check rpm because my tach is a glow bee (junk) dart board would work better. as for the fuel i used 0-10 nitro wild cat. I have tried all kinds of plugs but this set up work great. It seem all engines from 1.2 or bigger would be so easy to break in and no flame out.

(in reply to Hobbsy)
       Post #: 6

RE: 2 plugs are better than one? - 1/20/2008 3:19:38 AM   
wjvail



Posts: 375
Joined: 9/5/2002
From: Meridian, MS, USA
Status: offline 		http://runryder.com/helicopter/t299358p1/

I think there is a point of diminishing returns to adding plugs but more than one seems to be an improvement.

Bill
www.RCScreenProtectors.com


_____________________________

"Well, Nothing bad can happen now."

(in reply to geminitool)
       Post #: 7

RE: 2 plugs are better than one? - 1/20/2008 12:42:52 PM   
Hobbsy



Posts: 10683
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		A GloBee will read just fine.

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to geminitool)
       Post #: 8

RE: 2 plugs are better than one? - 1/20/2008 5:28:09 PM   
jessiej



Posts: 1803
Joined: 7/6/2003
From: STATESBORO, GA, USA
Status: offline 		I am still curious as to make and size of the engine, I have a dual plug Fox and a couple of dual plug Mercos, but could never tell any improvement over the single plug variants. They looked neat though.

jess

(in reply to Hobbsy)
       Post #: 9

RE: 2 plugs are better than one? - 1/20/2008 5:53:11 PM   
Sport_Pilot



Posts: 7728
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline
quote:

Thats why I like the OS-F glow plug so much for any twostroke engine bigger than a 91. The plug clears the midrange and makes it easy to set the needles rich for a nice thick smoke trail.


That means you are using low nitro fuel and the plug is hotter than it needs to be. When you have the right plug or nitro then the smoke trail will only be thick when accelerating. However, the needles will be harder to set, but you will have more power and or use less fuel.

Having more than one plug increases the timing much as having a hotter plug, some will use a cool and a hot plug but I am not sure of the mechanics of that. Of course it helps with reliablility as it will still run when one plug burns out. They were used on older engines when extra hot plugs were not available, and the ones they did have tend to burn out quicker than today.

< Message edited by Sport_Pilot -- 1/20/2008 5:57:09 PM >

_____________________________

“I Saw Elvis at 1000 Feet” John Force

(in reply to Flyer95)
       Post #: 10

RE: 2 plugs are better than one? - 1/20/2008 5:53:33 PM   
geminitool


 

Posts: 50
Joined: 2/4/2004
From: bumpus mills, TN, USA
Status: offline 		210 mark.

My globee tach read 12500 with a 20 x 8 I dont believe it . I need a better tach.
I just added the extra plugs to get rid of the sputter and not have a flame out in
my big bipe http://www.youtube.com/watch?v=e0xDTzO39Fs

(in reply to jessiej)
       Post #: 11

RE: 2 plugs are better than one? - 1/20/2008 6:12:34 PM   
DarZeelon



Posts: 7104
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: online 		Gemini,


That would have been over 16 HP....The Moki 2.10 (that's its real name) is a very capable engine, but 3.2-3.5 HP is about what you should get, around 9,000 RPM.

Having several plugs would allow the one that has the leanest mixture in its vicinity to ignite it in every revolution... Less missing is the result, but flame propagation will not be uniform.

I am not sure what that would cause...

_____________________________

Dar Zeelon - ISRAEL - ddzeelon@gmail.com
MVVS - Jett - Nelson - Bolly - Mejzlik

(in reply to geminitool)
       Post #: 12

RE: 2 plugs are better than one? - 1/20/2008 9:38:43 PM   
Broken Wings



Posts: 491
Joined: 1/15/2003
From: Spaceport, FL, USA
Status: offline 		I use a OS H-80 that has dual plugs. Runs great and it has never dead sticked. I've tried using one hot and one cold plug but can't tell the difference. Light either one and the engine runs

It makes me feel better having twin glow plugs............smiles

_____________________________

Regards,
John

(in reply to DarZeelon)
       Post #: 13

RE: 2 plugs are better than one? - 1/20/2008 11:38:21 PM   
jessiej



Posts: 1803
Joined: 7/6/2003
From: STATESBORO, GA, USA
Status: offline 		My GloBee generally gives the same readings as my TNC though the TNC is less sensitive to light conditions and will read from further away. For that matter my antique vibra-tac gives about the sane readings too and needs no light at all

jess

(in reply to geminitool)
       Post #: 14

RE: 2 plugs are better than one? - 1/21/2008 12:03:09 AM   
Broken Wings



Posts: 491
Joined: 1/15/2003
From: Spaceport, FL, USA
Status: offline 		Vibra-Tach...I remember those.

_____________________________

Regards,
John

(in reply to jessiej)