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Glow plug temperature ratings?

Old 05-02-2006, 03:04 PM
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Scott_GTR
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Default Glow plug temperature ratings?

Could some one please tell me if the glow plug temperature ratings have any bearing on hot your engine will run?

Its just I am trying to get the temperature down on my Genesis by lichenin up the fuel mixture. The lowest I can get it is ~140C (~284F).
If I go 1/4 turn more the thing won't pull away and stalls, which everything I have read says it is to rich!![]

I am in the UK and the temperature is currently around 15-20C (59-70F). Any recommendations on plug rating for this ambient temperature?

I am measuring the temperature with a MIP on board temperature gauge, and these are the peak temperatures it is reading.
All literature relates to driving the truck back to yourself and manually measuring it, but I have found it has lost 20+C (70F) by then.
So is a possibly momentary peak of ~140C (~284F) okay???
Old 05-05-2006, 12:20 PM
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Default RE: Glow plug temperature ratings?

Any one????[&o]
Old 05-05-2006, 12:24 PM
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jadda
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Default RE: Glow plug temperature ratings?

Hi scott_gtr!
What's your settings on the carb??? You should not have any problems with the temps when the engine is tuned right!!
Start with these setting flush or 0,5 in from flush on the LSN and 3,5 turns out on the HSN. Use OS 8 plug it has worked very well for me.
Old 05-05-2006, 12:53 PM
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Default RE: Glow plug temperature ratings?

jadda,

I have virtually flush (if not 1/2 in), on LSN and 4 turns out on HSN. Anything less then 4 turns caused it to run stupidly hot, (200C (400F)!!!![X(][X(]
I'm using 20% fuel but not a OS plug, Its a No7, but not sure what brand, but LHS said fine for cool days, or a No4 for hot days.
Old 05-05-2006, 01:42 PM
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Default RE: Glow plug temperature ratings?

Scott_GTR

I think you should check for air leaks around the carb and backplate. What fuel are you using?
Old 05-06-2006, 04:52 AM
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Default RE: Glow plug temperature ratings?

Jabba,

Thanks for the tip off!

I spent most of last night researching everything I could off of this and other forums.

Today I am going to go throught the whole truck with a fine toothed combe.

SHE WILL RUN SWEETLY!!!!!!! [>:][>:]
Old 05-09-2006, 12:58 PM
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Default RE: Glow plug temperature ratings?

ORIGINAL: jadda

Scott_GTR

I think you should check for air leaks around the carb and backplate. ...................

I checked both of them and NOTHING!!!! []

I am now having problems starting the thing and spent most of Saturday developing
painful blisters on my fingers from the pull start. Ended up breaking the tiny pin in
the eng of the crank, (for the second time).

I have now spent conciderably more time stripping it than driving it!!! []

How come people claim their starts on the 1-2 pull???

What is their technique????
Old 05-09-2006, 01:22 PM
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Default RE: Glow plug temperature ratings?


ORIGINAL: Scott_GTR
I am in the UK and the temperature is currently around 15-20C (59-70F). Any recommendations on plug rating for this ambient temperature?
I use an OS #8 plug in any temp. And I run my RC's anywhere from -25 C to + 30 C. when its cooler out you just have to richen it up a wee bit to account for the denser air.
Old 05-09-2006, 01:51 PM
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Default RE: Glow plug temperature ratings?

Sorry to hear all your problems Scott_GTR!!!
Mine do start at 4-5 pulls when the engine is primed!!! So check the tank so it close up correctly, you can also take put the glow plug and pull the pull starter and see if comes any fuel!!! If doesn't prime it more!

Good luck
Old 07-05-2006, 06:00 AM
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Default RE: Glow plug temperature ratings?

After a few week of breaking parts, (Crank shaft then gearbox), I am back on my tuning mission.
My Genny seems to be running fine power wise but its still over heating and then cutting out after 3-4 mins and 180C (356F) with the body off!!!!

That was with the base settings of flush on LSN and 3.5 turns out on HSN.
I tried richening it up HSN 1/4 turn but still cuts out maybe a little later.
Then another 1/4 turn richer, again I get a little longer, but I could hear and see it was not running well and struggled to pick up revs.
So then I tried to lean it out 1/4 turn from where I started, (Base setting), and it flew, even shifting into second during the first 1sec of wheel spin but the temperature was really rising fast. At this point I was out of fuel so game over for the day. :-(

I know an air leak has been suggested, but during my rebuilds I stripped the entire engine and carb and found the carb was quite well seated.
I did not try sealing with Vaseline as I though it was a tight enough fit not to need it.

Maybe I was wrong, but it must be some air leak to be giving me this much trouble.

I am using 25% fuel and an A3 OS plug.

Any suggestions please.
Old 07-05-2006, 12:13 PM
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Default RE: Glow plug temperature ratings?

I'm using 20% fuel and OS8 plugs. I had the same problem with my genesis cutting off after it's started. Mine was the slide needle was completely closing the carb so no air was getting in. I adjusted that on my radio and now it runs normal.
Old 07-16-2006, 03:24 PM
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Default RE: Glow plug temperature ratings?

Did you ever find out what was causing your problems? I recently had a very similar situation with a SuperTigre engine that was caused by a lack of backpressure from the muffler. I crimped one of the exhaust tubes on my Pitts muffler and that problem was fixed...I have since found other problems, but that's a different story.

Good Luck

Dave
Old 07-17-2006, 12:23 PM
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Default RE: Glow plug temperature ratings?

It was the plug my LHS sold me telling me it would work great.
But it was a hot plug and it ran at stupid temperature.

Now I am running a Xtra Cool plug and the temp is stable at a decent temp.

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