Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Webra 32 blowing glow plugs

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Old 01-02-2006, 05:35 PM
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Bob Payne
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Default Webra 32 blowing glow plugs

this is getting exspensive
a glow plug per flight,
Running Webra 32 on a 40 size Wildwiz Delta
Clocked 2 weeks ago at 116 runs fine
but i have to replace the glow plugs on almost every flight.
using os#8's should i go to an a3 or heli type plug?

Thanks
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Old 01-02-2006, 05:39 PM
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Default RE: Webra 32 blowing glow plugs

in pylon when that is happening make sure you are first not running to lean if not shim the head up
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Old 01-02-2006, 06:31 PM
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Default RE: Webra 32 blowing glow plugs

You might have a bearing problem if the head shim doesn't correct the problem. If a bearing starts to break down, the metal going though the engine will kill the plug.
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Old 01-02-2006, 07:51 PM
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Bob Payne
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Default RE: Webra 32 blowing glow plugs

What kind of and where do you get the shims?

Thanks
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Old 01-02-2006, 08:41 PM
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Default RE: Webra 32 blowing glow plugs

Bob, I think your WEBRA dealer would have extra head shims. What % nitro are you running in it?
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Old 01-02-2006, 09:34 PM
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Default RE: Webra 32 blowing glow plugs

ORIGINAL: Bob Payne

What kind of and where do you get the shims?
One quick test is to just put 2 washers under your plug. You could also give McCoy plugs a try. The model you choose would depend on what nitro you are running.
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Old 01-03-2006, 05:08 PM
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Bob Payne
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Default RE: Webra 32 blowing glow plugs

ok i'll try the 2 washers
running 15% omega
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Old 01-03-2006, 06:29 PM
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Default RE: Webra 32 blowing glow plugs

The 2 washer thing worked for me when I was blowing a plug every heat with my Picco .45. The long term fix was a cooler McCoy plug. I suspect that's why some people asked what nitro % you are running.

However, since you're running Omega 15%, the same fuel I use, and an OS #8, the same plug I'm using, in a Webra .32, which is what's in my MT Extra, you might want to look into the suggestion that your bearings may be going bad, or you're just running the engine too lean. Plugs are lasting a long time in mine.
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Old 01-03-2006, 07:17 PM
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Default RE: Webra 32 blowing glow plugs

to hot plug and to much nitro (european engines work fine without nitro)
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Old 01-03-2006, 07:57 PM
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Default RE: Webra 32 blowing glow plugs

ORIGINAL: wit-RCU

to hot plug and to much nitro (european engines work fine without nitro)
Perhaps, but they also work just fine with nitro.
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Old 01-03-2006, 07:59 PM
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Default RE: Webra 32 blowing glow plugs

I guess no one has asked - Did it run for a period without blowing a plug each flight? If so, then I would really want to inspect the bearings for possible "spalling". If experienced, you can often hear a bad bearing while the engine is running in the air, and feel them when turning over the engine slowly with a thrust load. However, most modelers are somewhat deaf and dumb when it comes to their power plants. It seems like most engine companies prefer to keep you that way too. These are skills that take time to develop, though that maybe shorten if you know someone that competes in an engine event like CL speed, free flight or Pylon racing.
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Old 01-03-2006, 10:32 PM
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Default RE: Webra 32 blowing glow plugs

Another thing to recognize is the difference between shaking a plug element apart, and actually blowing a plug. If your engine mount / firewall isn't stout and if the prop isn't balanced and running true, then vibration will fracture the plugs' element
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Old 01-03-2006, 11:48 PM
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Default RE: Webra 32 blowing glow plugs

thanks for all the tips

yes engine ran fine, until the stock muffler
broke in half, i replaced it with a moousecan and pipe
ran fine for a few flight s then just started blowing glow plugs
I richened it up a little sunday so it ran rich on ground
and that seemed to help also i quit running it wide open until
it quits on its own (Bad Idea I know) but flying the wildwiz at over 100
is such a thril and goes by so quick i started setting my timer for 5 minutes
and bringing it in then since it runs out about 6.5 minutes.

Gonna try a larger tank and raising the tank up higher if its nice this weekend.

Again Thanks
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Old 01-04-2006, 11:18 AM
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Default RE: Webra 32 blowing glow plugs

Engines blow plugs basically for one reason - a lean run.

The Webra .32 and .33 engines I have ran great from the factory. Head shims will not stop a habitual glow-plug blowing spree (its not a high compression F-1 engine....)

The first thing I would inspect is your fuel system . Over 90% of the trouble calls we see with the engines are fuel system related.

If the engine is blowing plugs, it is going lean - and if the needle is set at first, and the mixture changes ..... You ARE getting air in the fuel system. Either a leak, pinhole, punctured clunk line, kink or fuel foam. Check the tank, carb installation, needle valve, and all of the fuel lines.

You are very likely getting fuel foam while in flight. Adding the moouse can muffler probably pushed the rpm up to a range you had not seen previously, so the vibration levels are now higher. It is very common with high performance planes. The foam will cause a lean run, no matter how well you set the engine on the ground. It is rpm related. When the engine unloads in flight, the plane and fuel tank start to 'buzz' and resonate. This excites the fuel into a foaming mess. You will be ok for about the first minute of flight... after that, the engine will start sucking foam rather than liquid fuel. Engine goes lean - POOF - no more glow plug.

Make sure you fuel tank is isolated from the airframe. It can not physically touch the airframe. Foam padding works best. If that is not possible (as with a lot of delta type planes and some ARFS), you may want to consider switching to a bubble-free fuel system.

Running the tank dry basically does the same thing. Even with a good installation, the last 1/4 of the fuel will contain air bubbles and foam - and the clunk will be bouncing out of the liquid fuel.

I hope this is helpful.

Bob
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Old 01-04-2006, 11:56 AM
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Default RE: Webra 32 blowing glow plugs

along with what Bob said,

MCP's also change the tank pressure. depending on where you put the pressure tap [in the can] weird things can happen at different rpm.

also sometimes MCP's have odd timing effects that over/under scavenge the engine at varying rpms, you may need to run a LOT richer on the ground.
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Old 01-04-2006, 08:43 PM
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Default RE: Webra 32 blowing glow plugs

Hmm, about all I did for 20 years was run .36s in AMA combat fed off of high pressure bladders and controlled by a diaphram actuated pressure regulator. In short, the fuel delivery system was usually AOK, but plugs could still blow unless the compression was matched to the fuel and the climate. The best engines could be set at a slightly rich scream, the plane could look like it was sky writing with all the castor rich smoke pouring out, and you could still fry a plug in the middle of a round, but keep on going on diesel ignition [ at less rpm] till the fuel ran out.
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Old 02-23-2006, 09:13 AM
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ArthurD
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Default RE: Webra 32 blowing glow plugs

Try an OS R5 plug. If the engine likes it, i.e., will idle and give good throttle response, it will last longer than anything I've ever tried. They're cheap and available at most LHS or Tower.
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Old 02-23-2006, 12:04 PM
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Default RE: Webra 32 blowing glow plugs

Ok thanks

the a3's are working ok but i'll try an 5
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Old 02-24-2006, 08:26 AM
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Default RE: Webra 32 blowing glow plugs

Here's one reason for burning plugs that I learned from Tigre Engines ,UK :

Too much a voltage when starting! I have a ST G500 that burned one plug per flight, so when I threw away that power panel and began to use a single nicad cell giving the plug a dull red light the problem was gone! The plug was actually destroyed when firing the engine up, but continued to run for that particular flight, but the circuit was broken so it didn't glow on electricity!

Br Henrik
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Old 02-24-2006, 09:14 PM
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Default RE: Webra 32 blowing glow plugs

Bob,

Be sure you use an OS R5, not just a regular OS #5. They are quite different The 'R' designation is important!

Let us know how it works.

Arthur
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