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glow plugs

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cmb97

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I was running a long glow plug in my storm and it worked A buddy bought a new storm and it had a short glow plug in it
which one should we be using
 
I would stick with an os.#8. My stock plug was a long. So my answer is........

[move][shadow=red]LONG[/move][/shadow]


I hope that worked(html code, having fun with it)
 
I had way more luck with the McCoy MC9 and MC59 in that engine which is a long plug, the OS 8 will work but seemed a tad harder to tune for and I did notice a lose in power I had to make up for by leaning it a little.
 
Interesting... so what is a different plug that will work well in place of the OS8? I have always used the OS8, but if more power is to be had with a slightly less agressive tune, I am all about it. Will this plug work in any .21?
 
Originally posted by WA2FAST
Interesting... so what is a different plug that will work well in place of the OS8? I have always used the OS8, but if more power is to be had with a slightly less agressive tune, I am all about it. Will this plug work in any .21?
Click to expand...

What engine do you run?
 
I would say mc 9. After i bought os8 i read a post like this and relized mc is the way to go. From experince i have only run os8 and liked it.
 
we were running the mc59 and we were having trouble with them
it would be good for one lap and it would spit and fart. Would put a new one in and would go for a little while and then do the same thing
 
My arch nemisis puts a storm. LOL!!!!!!!!!
Anyways he runs the stock B01 with an OS A5.
 
Yeah, I was wrong... I am running an OS A5 plug. I am running the stock motor that came with my Swift for now... the SH.21. I am wondering now after reading cmb97's post if the plug may be the cause to my problems... My car is posessed sometimes. It will run either rich or just right temp wise and have perfect power on the 1st tank, then the second tank, it's like someone leaned it way out... runs like 30-40 degrees hotter and the smoke trail dissapears... less power too. It's really starting to get on my nerves... like I have to compinsate the tune when I refill. Do you think the plug has anything to do with this?
 
Originally posted by WA2FAST
Yeah, I was wrong... I am running an OS A5 plug. I am running the stock motor that came with my Swift for now... the SH.21. I am wondering now after reading cmb97's post if the plug may be the cause to my problems... My car is posessed sometimes. It will run either rich or just right temp wise and have perfect power on the 1st tank, then the second tank, it's like someone leaned it way out... runs like 30-40 degrees hotter and the smoke trail dissapears... less power too. It's really starting to get on my nerves... like I have to compinsate the tune when I refill. Do you think the plug has anything to do with this?
Click to expand...

If the smoke trail has gone and the head temperature is up 40 degrees then it probably is running too lean.

Check the engine for air leaks, particularly around the carburettor.

On my SH engine the carb pinch bolt is has a spring washer under the nut and sometimes works loose. Use threadlock and tighten the pinch bolt again.

Check the o-ring seal between the carb and the crankcase.

If necessary, use high-temperature RTV to seal the carb neck in the crankcase, the pull-start back-plate to the crank-case and the pull-start housing to the back-plate.

Check that the pressure line to the fuel tank is not gummed up with burnt oil.

Check that the fuel tank is pressurized and holding pressure. Hold the tank under water with the filler cap shut and two pieces of tubing attached to the pipe unions. Blow into the pipes (gently or you will blow the filler cap off) and check for air bubbles.

Make sure there is no water inside the tank before you put it back on the car.
 
Originally posted by niggle
If the smoke trail has gone and the head temperature is up 40 degrees then it probably is running too lean.
Click to expand...
Exactly what I say, but why in the world does it change consistantly between one tank to the next? I can tune it rich for the first tank and have it just fine for the second, but what's the relation?

Originally posted by niggle
Check the engine for air leaks, particularly around the carburettor.
Click to expand...
If this is the case, wouldn't it be all of the time then? Not just on the second tank?

Originally posted by niggle
On my SH engine the carb pinch bolt is has a spring washer under the nut and sometimes works loose. Use threadlock and tighten the pinch bolt again.

Check the o-ring seal between the carb and the crankcase.
Click to expand...
I will check those things for sure now that you mention it.

Originally posted by niggle
Check that the pressure line to the fuel tank is not gummed up with burnt oil.
Click to expand...
It's not... I have checked the tank over and it's good. I haven't checked for pressure yet, but I didn't think that would have anything to do with it, maybe it does have something to do with it?

You mentioned very valid points and good things to check, just that I didn't think about them becuase the first tank is always different from the rest, so I wasn't really sure what it was. I have since just compinsated and have it running a little rich, the first tank eventually gets good towards the end, then from then on, it is good. Another thing I have noticed... this I don't like... it seems the happiest at real high temps... when I fatten it up to bring the temps back down in the 250 range, I lose some performance... it seems to love being up around 280-290, but that's just too hot if you ask me.
 
Originally posted by WA2FAST

Exactly what I say, but why in the world does it change consistantly between one tank to the next? I can tune it rich for the first tank and have it just fine for the second, but what's the relation?

If this is the case, wouldn't it be all of the time then? Not just on the second tank?

It's not... I have checked the tank over and it's good. I haven't checked for pressure yet, but I didn't think that would have anything to do with it, maybe it does have something to do with it?

You mentioned very valid points and good things to check, just that I didn't think about them becuase the first tank is always different from the rest, so I wasn't really sure what it was. I have since just compinsated and have it running a little rich, the first tank eventually gets good towards the end, then from then on, it is good. Another thing I have noticed... this I don't like... it seems the happiest at real high temps... when I fatten it up to bring the temps back down in the 250 range, I lose some performance... it seems to love being up around 280-290, but that's just too hot if you ask me.
Click to expand...

After the first tank the engine will warm up and the metal will expand. It is possible that the carb neck on the crankcase is expanding enough to allow air to leak in. The pinch bolt will also expand and loosen its grip on the carb.

Fuel tank pressure decreases as the tank empties.
The air/fuel mixture at the carb leans out as tank pressure decreases.
As there is no fuel line pressure regulator on your car this means that the mixture leans out as the tank empties.
If you are losing pressure in your tank then when the tank is nearly empty your mixture could be way too lean.
You need to adjust the mixture for the worst-case condition, i.e. tank nearly empty.

I have the same problem as you with my SH. I'd like to keep temperatures below 240F but I have to tune it way too thick to do this. I get acceptable performance at 290F and there is still a visible smoke trail, but that is way too hot.

I have some new fuel (less oil content) and a couple of different glow plugs to try. I also have a cooling head off a Savage .21 to try - the stock SH cooling head seems weedy in comparison.

SH claim 2.1HP @ 28,000 RPM for this engine. If I could actually get it to run to 28,000RPM then it probably would make nearly 2HP.

I'll let you know how I get on...
 
Oh yeah... please let me know when you get try the different plugs and the cooling head. I am very curious as to how that goes. I will check the other things in the meantime, but just like you said... right now, it IS tuned for worse case so that it doesn't spike too much over 260 near the end of the tank, but it just pisses me off how rich I have to run it to keep it in these temps. I can tell when it's running hot because it screams. Please let me know when you figure that out, thanx!
 

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