what glow plug

[tbbh-teacher]

I have a XTM 24/7 and A rustler and an inferno is there a glow plug that will work with all three. I am just a basher not a racer can someone help me out with this thanks for the help.

 

[olds97_lss]

I'm not sure what the inferno is or size of engine. But, with 21's and larger, you normally want to run a medium to cool plug. For 15 engines and smaller (rustler), you normally want a hotter plug.

Personally, I run an OS #8 (medium) in my 21's and 18's, OS #3 (hot) in my 15's. But I no longer have 15's to worry about.

I used to run the OS #3's in my 21's, but after putting in a OS #8, I got much better power and cooler running temps.

The heat rating of the plug determines when the fuel will fire in the stroke. The hotter the plug, the earlier the fire, the cooler the plug, the later the fire. I think running the hot plugs in my 21's was causing early detonation which was making the engine fight itself on the upstroke.

 

[tbbh-teacher]

very informative thanks for that bit

i dont see a #3 i see an a3 i dont think that is the same thing is it. It says it is a hot plug though.

 

[olds97_lss]

Sorry, yeah, I forgot. It's been awhile since I bought one. I just knew it had a 3 in it.

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXCB26&P=7

 

[tbbh-teacher]

whats the diffrence between a long plug and not long plug I know it can hit the piston but when should someone use a long plug

 

[vbgagnon]

I always ran a mc59 in my 24.7 anything other then that I couldn't get the tune right. I'd go with a mc59 for all of your mills.

 

[CorradoPsi]

mc59 is ok for small blocks, but its a bandaid for poor tuning on big blocks. an mc8 or mc9 would be more appropriate for the 24.7

the short and long plugs are only different in length by about .030" short plugs are OS plugs designed for thier engines and hpi uses them as well iirc. the long plug is the standard used by most engine manufactures. if you have the wrong plug in, the engine will usually run, but very poorly. if your in doubt, you can remove the head from the engine and look to make sure that the plug is flush with the combustion chamber. if you have the wrong plug in, it will either stick into the chamber or recess out of it. there is an excessively long plug used by airplane and heli engines with whats called an Idle bar, this plug is blatently too long and has an extension about .150" beyond the end of the threads, never use this type of plug.

what your trying to do, by running the same glowplug in every engine is going to hinder the performace of all your engines. every engine takes a different plug, heck i probibly have 15 plugs in my box of 6 different types, all for different engines and weather conditions.

 

[Plaidfish]

I keep
OS-8
A5
Dynamite med turbo
RB-6
Odonnells-99
Rossi-6
MC-8
MC-9
all for different types of engines......if you want it to run right get used to it

 

[tbbh-teacher]

i suck at tunning, regretably i say this. I practice it be going to stock settings and trying to get it right from there but i havent been able to keep a good tune all the way through a run. As the tank leans the temps goes up my smoke trail is almost invisable so i have to start rich. I wanted to try another glow plug to see if it heps.thanks for all of your inputs

 

[olds97_lss]

All I've ever used with good success where the two I mentioned. I've tried others, but they weren't as reliable from plug to plug. But, since I pay $8 a piece for OS #8's, they better last me awhile!

I've only run a few brands of engines though... I'm sure a lot of these guys have tried more than me.

Here's what I had and what worked well:
Orion Wasp 18 - OS #8
OS 21 RG - OS #8 (Tried #5's like the book said, but ran like ass.)
Omega 21 Comp - OS #8
OS 15 cv-r(x) - OS A3
OS 18 CV-R(x) - OS #8

I primarily use Trinity MHP 20% in all my engines. Occasionally, I'll buy a gallon of byrons 20%, but only when they don't have the MHP.

I tried the mccoy plugs MC 59's in my 15's and 18's, but they didn't run as well as the OS plugs.

 

[NITEMARE]

All I use are OS#8's with O'Donnell 30% in my vehicles.

 

[bustedgears]

I use a3s in the small blocks and 8s in the big blocks

 

[tbbh-teacher]

even if the engine is not an OS ? I mean this in refrence to


mc59 is ok for small blocks, but its a bandaid for poor tuning on big blocks. an mc8 or mc9 would be more appropriate for the 24.7

the short and long plugs are only different in length by about .030" short plugs are OS plugs designed for thier engines and hpi uses them as well iirc. the long plug is the standard used by most engine manufactures. if you have the wrong plug in, the engine will usually run, but very poorly. if your in doubt, you can remove the head from the engine and look to make sure that the plug is flush with the combustion chamber. if you have the wrong plug in, it will either stick into the chamber or recess out of it. there is an excessively long plug used by airplane and heli engines with whats called an Idle bar, this plug is blatently too long and has an extension about .150" beyond the end of the threads, never use this type of plug.