K5.9 Glow Plug

[Bill_G]

Got the 5.9 running and seems to run pretty good. Just wondered what plug people are using. I have the original R5 and tried a MC8. Can't say I noticed a difference, but the engine isn't fully broke in and haven't leaned out too much yet either.
I know generally the bigger the engine the colder the plug. Would this engine benefit from the MC8? I always ran MC8's or medium plugs in my other big blocks (.21-.28s).

Runnin 20% O'Donnell
Thanks

 

[Combuster]

with 20% i run a mc59 which is a hot plug

 

[MikeK1981]

I'm running a plug that says it's "medium-hot" and it works really well in my 5.9.

 

[unicorn87]

What do you guys think about this glow plug for 5.9 mill using with 20% or 25% nitro content.I'm chosing betwen this and hpi R5
Dynamite monster