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Post  Iceberg Mon Aug 10, 2020 11:34 am

I have in the past had some good success with the fireball plugs using them. However as of late I have had a bad run of leaking fireball plugs. Are there any other inserts that still use the same 1/4 x 32 thread and are rock and roll tight and never leak? I'm just concerned because I can't seem to keep the Fireballs from leaking and have a number of the threaded heads with 1/4 x 32 thread that I would like to get back FLYING.

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Post  Levent Suberk Mon Aug 10, 2020 11:54 am

I use OS No.8 glow plug. Try to add a little amount of silicone RTV gasket sealant around glow plug threads. Also you can try PTFE tape around threads, however I didn't try it yet.
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Post  aspeed Mon Aug 10, 2020 12:32 pm

I have a couple cards of Fireballs too.  I knew ahead of time that they leak, so I dabbed some epoxy over the seal.  They still leak.  Somewhere on one of these forums a guy pulled a vacuum when he applied the epoxy (or CA?) and it seemed to work for him.  We used the Fireball cool plugs for the higher nitro in the Supertiger/Rossi .15s Goodyear racing as the element would hold up well.  The seal was the weak point.  As far as your next plug is concerned, make sure the length is right.  Flush with the combustion chamber.
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Post  Ken Cook Mon Aug 10, 2020 2:07 pm

I mentioned this the last time, Thunderbolt plugs. Depending on engines, I use either idle bar or non idle bar. Available through Mike Goes Flying.com. OS plugs work for some engines, the problem with them is that they're in between a short and a long length. They're a medium length plug which can be problematic in some engines causing inconsistency. If your looking for a durable hot plug, Thunderbolt can't be beat. If you want more duration, Enya #3. If your using nitro higher than 15%, go with the Enya #4.
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Post  aspeed Mon Aug 10, 2020 3:03 pm

Ken Cook wrote:            I mentioned this the last time, Thunderbolt plugs. Depending on engines, I use either idle bar or non idle bar. Available through Mike Goes Flying.com. OS plugs work for some engines, the problem with them is that they're in between a short and a long length. They're a medium length plug which can be problematic in some engines causing inconsistency. If your looking for a durable hot plug, Thunderbolt can't be beat. If you want more duration, Enya #3. If your using nitro higher than 15%, go with the Enya #4.
I don't think Mike Goes Flying ships anything out of the US yet, in case Iceberg needs to know.
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Post  Iceberg Sat Sep 12, 2020 7:18 pm

So the
OSMG2691   —  OS #8 Glow Plug 2-C Med plug is recommended and is a good one? I'm about to buy but wanted one last check? They still use 1.5 volts to start like fireball?


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Post  Oldenginerod Sat Sep 12, 2020 8:35 pm

I'd say Enya #3 every time, but as Ken mentioned the "medium" length of the OS #8, Enya plugs are the same length, but unless you overpower an Enya, you'll never blow one.
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Post  Iceberg Sat Sep 12, 2020 10:28 pm

These OS plugs work with 1.5 volts?
Thanks
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Post  Mark Boesen Sat Sep 12, 2020 11:37 pm

aspeed wrote:
Ken Cook wrote:            I mentioned this the last time, Thunderbolt plugs. Depending on engines, I use either idle bar or non idle bar. Available through Mike Goes Flying.com. OS plugs work for some engines, the problem with them is that they're in between a short and a long length. They're a medium length plug which can be problematic in some engines causing inconsistency. If your looking for a durable hot plug, Thunderbolt can't be beat. If you want more duration, Enya #3. If your using nitro higher than 15%, go with the Enya #4.
 I don't think Mike Goes Flying ships anything out of the US yet, in case Iceberg needs to know.

i used to use Thunderbolts, great plug!
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Post  Iceberg Sun Sep 13, 2020 1:00 am

Hi Ken
So the OS plugs use 1.5 Volts to start not higher voltage?

Thanks
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Post  Oldenginerod Sun Sep 13, 2020 2:15 am

Iceberg wrote:Hi Ken
So the OS plugs use 1.5 Volts to start not higher voltage?

Thanks
Ice

They are 1.5 volt.
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Post  GallopingGhostler Sun Sep 13, 2020 5:25 am

Iceberg wrote:I have in the past had some good success with the fireball plugs using them. However as of late I have had a bad run of leaking fireball plugs.

About 8 years ago I bought a card of hot Fireball plugs. The entire card was bad, poor quality platinum wire. They'd light off okay, then a week later wouldn't fire, only sputter.

Since I've bought cards of the generic Chinese hot plugs, so far seem to work good.
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Post  Ken Cook Sun Sep 13, 2020 6:16 am

I mentioned this in my other post in regards to the plug length. I believe I'm correct on this, the #8 used to be designated as the A5. OS changed all their plug numbers for some reasoning. The #8 is considered a short. However, OS plug lengths are not the same as what most consider long and short reach. They're in between which alters the timing. Seeing that you didn't mention what engine your using this in, I can only assume it's for a head adapter that uses standard plugs on a 1/2A. I don't use them as they rob too much power and I can't comment on them. I do know that if the plug length doesn't make it to the same length as the Fireball plugs you were using, your going to have a further drop in compression due to the void, thus making the power band even less. It really comes down to experimenting. Most plugs today are basically 1.5 volts. Colder plugs sometime require a touch more.
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Post  Iceberg Sun Sep 13, 2020 10:19 am

Many fine comments and information.
I noticed that OS also sells this plug. It is longer so returning the compression. Might it be ok? Using on 1/2 A conversion heads.

OS #LC3 Glow Plug 2-C Hot TRX

Thank you
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Post  SkyStreak Sun Sep 13, 2020 3:30 pm

Do the plugs leak at the element seal or the head gasket seal.
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Post  Iceberg Sun Sep 13, 2020 3:39 pm

element seal
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Post  Ken Cook Sun Sep 13, 2020 5:57 pm

The problem I see is that there making claims that this plug works from 5%-20% nitro which I feel is a long stretch. Generally hot plugs work for up to and no more than 10%. When you use a hot plug with high nitro fuels for 1/2A's, it pre ignites causing poor performance. Again, OS plugs are not the same as standard length plugs so suggesting using them could very well be problematic for your use. Only trying them will let us all know. What I'm saying is that not only is the length not theoretically correct, now the heat ranges are not either. It might work, It might not work. I can only comment on my knowledge of using hot to cold plugs on larger sized engines they were designed for. I never use head adapters so all my knowledge might be incorrect. One thing that I do know is that you don't use a hot plug for high nitro fuels.
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Post  Iceberg Mon Sep 14, 2020 10:37 am

Thanks Ken
Good to know!
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