R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 09-21-2009, 11:01 AM   #1
Tech Adept
 
Join Date: Mar 2009
Posts: 207
Trader Rating: 5 (100%+)
Default glow plug life

i know it is one here but i tried all morning long to find it and i couldnt
how do you tell how your motor is running based on the glow plug? if i remember correctly if it is turning black and is wet the motor is still rich? does that sound right or am i off here
thanks
quicklosi is offline   Reply With Quote
Old 09-21-2009, 11:16 AM   #2
Tech Regular
 
XXX8ight's Avatar
 
Join Date: Mar 2009
Posts: 395
Trader Rating: 47 (98%+)
Default

If the plug is black that usually means it was running too lean. Maybe it ran lean before u made adjustments. The plug needs to be a little wet. You want your plug to be a light golden brown.
XXX8ight is offline   Reply With Quote
Old 09-21-2009, 09:51 PM   #3
Tech Master
 
Join Date: Jul 2007
Location: Rossville Ga
Posts: 1,398
Trader Rating: 10 (100%+)
Default

Black is rich. White is too lean. White and distorted is wat too lean.
bigde2001 is offline   Reply With Quote
Old 09-21-2009, 11:58 PM   #4
Tech Adept
 
Join Date: Mar 2009
Posts: 207
Trader Rating: 5 (100%+)
Default

now i have 2 different responses. can anyone, maybe an engine modder, clarify this or show me where i can
quicklosi is offline   Reply With Quote
Old 09-22-2009, 09:22 AM   #5
Tech Adept
 
Join Date: Mar 2009
Posts: 207
Trader Rating: 5 (100%+)
Default

bump. little help
quicklosi is offline   Reply With Quote
Old 09-22-2009, 09:58 AM   #6
Tech Elite
 
Join Date: Mar 2009
Location: Aurora, Colorado
Posts: 3,644
Default

http://redirectingat.com/?id=42X1295...g-reading.html





What exactly is our glow plug telling us.

So you are wondering if you have rc nitro engine tuned correctly.

You check your temperature on a regular basis, but you are still not sure.

You can examine your glow plug to get a very good idea. Examining the glow plug is a peek inside the combustion chamber.

But let's get the big picture and take the head button off, while leaving the glow plug installed in the head.

What we are going to see by looking at the head button and the glow plug is the entire combustion process.

This is going to show use just what is left after the burn process.

By looking at the entire combustion chamber we can analyze what was happening during the burn.

Let us explore a few different tuning examples below.







Pictured above is an example of a Rich Setting.

This is what your glow plug and head would look like after break-in.

The head and glow plug will be very wet with oil. Every thing still looks new.

No discoloring of the head, plug body or plug coil. If this is the look just after break-in that is great.

But, if this is post break-in then you are going to need to start leaning the engine out, to reach correct combustion.

If you run in a too rich state for a long period of time, oil will build up in the crank case and cause the front bearing seal to leak.



The previous example is of a Too Lean or Detonation Condition.

Upon examining your head and glow plug you find or feel little or no oil residue.

The glow plug body is blued. The coil wire has broken away from the plug body.

You see that the combustion chamber is silver to slightly tan. Plus the head and glow plug are extremely pitted.




Your nitro engine is running too lean.

The pitting is caused by detonation.

Detonation is when the fuel air mixture pre-ignites in many different areas of the combustion chamber at one time.

The top of the piston will show the same kind of damage. If you see this kind damage you need to richen up your engine.

You may need to also shim your head. Increasing your head clearance will lower compression and lessen the possibility of detonation.











In the above example you can see why it is important to look at the head and glow plug together.

This example shows a Borderline Lean with a Good Glow Plug.

By just looking at the glow plug you would think that your nitro engine tuning was correct.

But, looking at the head you see that there is some pitting occurring.

With seeing this damage you know that your rc nitro engine is tuned too lean and you need richen your carberator setting some.








If you are a serious racer, this is how your glow plug and head should look.

Above is an example of a Perfectly Tuned Race Engine.

As you can see on this head and glow plug there is an even coloring across the combustion chamber and glow plug.

If you do a lot of racing this is the coloring you are looking for, that light brown to deep golden color.

This shows you that you are getting the most out of your engine. Your nitro engine tuning is producing maximum power and you have the perfect tune on your engine.

The only thing that you will need to do is keep your eye on is atmospheric conditions, temperature and humidity.

As these conditions change, so is the tune on your engine. So, always be aware of the weather conditions to help with your nitro engine tuning.








The previous example is of a nitro engine that has a Safe Every Day Tune.

If your head and glow plug look likes this example and you are a novice racer or a basher, this is great.

You have done a great job of tuning your nitro engine.

The combustion chamber shows a little color, gold to tan.

Plus, the chamber and plug are still quite wet with oil residue.

The glow plug also shows some color on the body of the plug, grey to tan.

The coil wire will be shiny, silver and still have a new look to it.

The only place the coil wire should show some color is where it contacts the outer body of the plug.

At this point the coil wire should be slightly black.

This head and glow plug show an engine that is running great, a little on the rich side.

This type of tune on your nitro engine is very good to get the maximium life out of your engine.

Plus, this tune would be great for bashing and even for most of us weekend racers.



Taking the Mystery out of the Glow Plug








In this example we see a glow plug that has been run at a Lean Setting and has got very Hot.

On inspection we see that the outer body has turned black.

The coil wire has a white dusty appearance.

Plus, the coil wire has small breaks in the electrode wire.

All of this is due to the very extreme heat of running lean.

This glow plug is near failure, the coil wire is close to breaking free of the body.

If the tip of the coil wire was to break off it could travel down into the engine causing severe damage to piston, bearings and head button.

But, most times when the coil wire does break off it will just go out an exhaust port causing no damage.

This will not always happen, if the coils wire stays inside the engine it will destory many internal components.

Not COOL.

I hope this has given you a little insight about nitro engine tuning. The glow plug what makes our nitro engines run.

Besides just looking at our glow plugs, it is important to remove the head button and look inside our engines on a regular basis.

Doing so is going to give us the whole picture of what is going on, not just a little peek the glow plug gives.

Yes, checking our glow plugs often is very important and gives a good look at what is going on inside our engines.

But, just remember that this is not the big picture.

Take a few minutes to clean your engine thoroughly, remove the head button and take a close look at what is going on inside.

http://www.rc-truckncar-tuning.com/G...g-reading.html

How to "READ" your glow plug.
OS and Turbo glow plugs go gray sooner [easier] than McCoy plugs; this is not necessarily bad. Actually when A new plug wire just goes slightly gray after a 5 or 10 minute hard run it means your very close to an optimal horsepower tune, but be careful the next step is TOO LEAN!

My rule of thumb.
1} Wire and surrounding bottom of plug wet, with like new shiny wire = rich side of optimum power 85%
2} Wire and surrounding bottom of plug starting to dry and wire starting to gray = Very close to optimum power 95%
3} Wire and surrounding bottom of plug dry, wire totally gray but not distorted optimum power 100%
4} Wire and surrounding bottom of plug dry, wire distorted = slightly lean DANGER!
5} Wire and surrounding bottom of plug dry, wire broken and distorted or burnt up = extremely lean possible engine damage!

Note: You can only "Read" your plug in a nearly new state [Wire like new and shiny] A gray plug can still operate well. But after it has totally gone gray performance can start to fall off. To test just put in a new plug and if there is no difference in performance save the gray one or put it back in. If your engine does not feel or run right tray a new plug before making major tune change's

Good Luck
(information from Paris Racing)
__________________
TLR - Spektrum - Horizon - TLR 8ight 4.0 - TLR 8ight-T 4.0 - TLR 22 4.0 - Orion

Last edited by token; 09-22-2009 at 10:25 AM.
token is offline   Reply With Quote
Old 09-22-2009, 10:10 AM   #7
Tech Regular
 
Brandon_oma#692's Avatar
 
Join Date: Jul 2009
Location: Freeport, IL
Posts: 301
Default

TOKEN can you link to that so i can see the pics?
Brandon_oma#692 is offline   Reply With Quote
Old 09-22-2009, 10:24 AM   #8
Tech Elite
 
Join Date: Mar 2009
Location: Aurora, Colorado
Posts: 3,644
Default

Quote:
Originally Posted by Brandon_oma#692 View Post
TOKEN can you link to that so i can see the pics?
http://redirectingat.com/?id=42X1295...g-reading.html
__________________
TLR - Spektrum - Horizon - TLR 8ight 4.0 - TLR 8ight-T 4.0 - TLR 22 4.0 - Orion
token is offline   Reply With Quote
Old 09-22-2009, 11:14 AM   #9
Tech Adept
 
Join Date: Mar 2009
Posts: 207
Trader Rating: 5 (100%+)
Default

thanks token... that is exactly what i was lookin for
quicklosi is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
The Best Glow Plug Igniter on teh market?? DirtRacer Nitro Off-Road 32 05-31-2011 07:55 PM
blowing glow plug muaythai Nitro Off-Road 15 07-03-2009 08:15 PM
Glow plug lot...No longer running nitro RaptorRidr660r R/C Items: For Sale/Trade 9 05-24-2009 02:07 PM
Is my glow plug working properly? bosley Nitro Off-Road 13 03-09-2008 02:23 PM
Shimming, nitro %, glow plug and timing blanks596 Onroad Nitro Engine Zone 30 06-15-2007 02:51 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 04:59 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net