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Cox Engine of The Month
Best Plugs
Page 1 of 1
Best Plugs
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.
Thanks
Iceberg
Thanks
Iceberg
Iceberg- Gold Member
- Posts : 329
Join date : 2018-11-03
Location : Bangkapi Thailand
Re: Best Plugs
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.
Levent Suberk- Platinum Member
- Posts : 1178
Join date : 2017-12-24
Location : Turkey
Re: Best Plugs
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.
aspeed- Platinum Member
- Posts : 538
Join date : 2013-01-18
Location : Leamington Ont. Can.
Re: Best Plugs
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.
Ken Cook- Top Poster
- Posts : 4216
Join date : 2012-03-27
Location : pennsylvania
Re: Best Plugs
I don't think Mike Goes Flying ships anything out of the US yet, in case Iceberg needs to know.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.
aspeed- Platinum Member
- Posts : 538
Join date : 2013-01-18
Location : Leamington Ont. Can.
Re: Best Plugs
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?
Thanks
Ice
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?
Thanks
Ice
Iceberg- Gold Member
- Posts : 329
Join date : 2018-11-03
Location : Bangkapi Thailand
Re: Best Plugs
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.
Oldenginerod- Top Poster
- Posts : 3279
Join date : 2012-06-15
Age : 58
Location : Victoria, Australia
Re: Best Plugs
These OS plugs work with 1.5 volts?
Thanks
Iceberg
Thanks
Iceberg
Iceberg- Gold Member
- Posts : 329
Join date : 2018-11-03
Location : Bangkapi Thailand
Re: Best Plugs
aspeed wrote:I don't think Mike Goes Flying ships anything out of the US yet, in case Iceberg needs to know.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 used to use Thunderbolts, great plug!
Re: Best Plugs
Hi Ken
So the OS plugs use 1.5 Volts to start not higher voltage?
Thanks
Ice
So the OS plugs use 1.5 Volts to start not higher voltage?
Thanks
Ice
Iceberg- Gold Member
- Posts : 329
Join date : 2018-11-03
Location : Bangkapi Thailand
Re: Best Plugs
Iceberg wrote:Hi Ken
So the OS plugs use 1.5 Volts to start not higher voltage?
Thanks
Ice
They are 1.5 volt.
Oldenginerod- Top Poster
- Posts : 3279
Join date : 2012-06-15
Age : 58
Location : Victoria, Australia
Re: Best Plugs
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.
GallopingGhostler- Diamond Member
- Posts : 2581
Join date : 2013-07-13
Age : 66
Location : Clovis, Nuevo México
Re: Best Plugs
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.
Ken Cook- Top Poster
- Posts : 4216
Join date : 2012-03-27
Location : pennsylvania
Re: Best Plugs
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
Iceberg
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
Iceberg
Iceberg- Gold Member
- Posts : 329
Join date : 2018-11-03
Location : Bangkapi Thailand
Re: Best Plugs
Do the plugs leak at the element seal or the head gasket seal.
SkyStreak- Bronze Member
- Posts : 31
Join date : 2018-02-26
Location : Mo
Re: Best Plugs
element seal
Iceberg- Gold Member
- Posts : 329
Join date : 2018-11-03
Location : Bangkapi Thailand
Re: Best Plugs
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.
Ken Cook- Top Poster
- Posts : 4216
Join date : 2012-03-27
Location : pennsylvania
Re: Best Plugs
Thanks Ken
Good to know!
Iceberg
Good to know!
Iceberg
Iceberg- Gold Member
- Posts : 329
Join date : 2018-11-03
Location : Bangkapi Thailand
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