I just wonder if there is another reason the hotter plugs seem favored over there....If I were to take a guess I am going to say it is the fuel.....A hotter plug will make a engine more forgiving of higher oil,lower nitro,higher water content or basically anything that makes the fuel less combustible......On my fuel I would never be able to tune a F11 to peak performance using a P3 or P4...I would destroy the plug very rapidly....The only way I could run those plugs would be to have the needle settings rich, or add a extra head shim, which unfortunately would have other negative side effects....... Basically in the end maybe the P3 and P4 are the only plugs they are able to get stable performance from with the fuel they are using...Which would also mean they are not running these engines at their peak efficiency either..... So many little factors affect these little engines...fuel being a huge variable .....

Also I have seen guys go back and forth between Nova,OS and Werks plugs with no issue or damage to the head button......I don't do it, nor do I recommend it.....But I can't argue with what I have seen with my own eyes ! Some of my locals do this all the time, I think sometimes just to bug me LOL .....But in the end it caused no ill effects, as much as I hate to say...I actually lost a coffee bet over the topic this summer !!!

I know this situation here in Germany.
All my teammates are running p3 plugs in their RB Engines without any issues.
That was the reason I used p3 plugs in my x10.

Now I bought a X11 Box and want to try the Nova/RB plugs from the beginning.
So where is the difference between the C6TGC and RB No.6.
When would you use the C5 and when the C6 plug?

I have no doubts... I Am just curious as to the mechanical reason why you guys are needing and choosing to run such hot plugs..... I thinking we possibly just have better fuels over here that allow us to run much cooler plugs without having tune issues......If I were to run some of the off the shelf fuels I probably would also have to switch up to a hotter plug to aid combustion.........

I was pitman for a F11 in November. The engine ran perfect with Novarossi #6 and 25% Lamberto fuel.

Neal: In Germany and many other countries in Europe we are only allowed to run 25% nitro.

in england if you run rb you would use c6 plug with byron 25 or 30 i would not touch tornado with a barge poll its not very good gear byron or racing experience fuel both very good also you would not run os plug in rb or vise versa i dont even think you get a proper seal because of the pitch

Also to consider is actual nitro % ...sometimes the claimed content and actual content are different...Also purity of the methanol used....different country, different refining techniques and regulations etc. etc..........

The RB #6 would be similar to the Nova C6TGF and the RB5 to the C5TGF. These cold body plugs work great on an engine that is broken in and tuned to make max power. When your running rich breakin settings the RB plugs will just not stay hot enough to keep the fuel burning and like many people have said they have trouble keeping the engine running. This is probably why people started down the OS plug path and once it fixed their issue of running rich at breakin settings they stayed with it and started to swear by it.

Also IMO if I was running a fuel where even team drivers say they have to do something like run an Ultra hot OS plug in a Nova engine I would be switching fuels because something isn't right in that equation to me. Not when many people all over the world using other fuels can get it working without the ultra hot OS plug. Heck even those P4 OS plugs are hotter than the C5TGC and explains why some of them were adding head shims. That to me should not be necessary.

As for when to run what plug. If I run the RB plugs I only run the #5 plugs. Even with that RB #5 plug your tune is going to have to be very close to the full on race tune. Where you see it the most is right after a pit stop and the engine dies. Yes a hotter plug will help that but a correct tune will also help that situation. With the Nova plugs I run the C5TGC almost all the time unless it's over 90 degrees... Then I will use the C6TGC. The biggest thing is finding what works best for YOU and what helps you keep your engine running.

Very good advice chris

I did a comparison this summer between Picco and OS plugs, just to see the difference. Picco plugs is also hard to find here right now as we don´t have any importer for Picco.
I usually run Picco P6TH and I tried a OS RP8. After giving both needle 1/2 turn out I fired up the engine, it started to machine gunning so bad that I turned both needles 1/2 turn more out. But then the engine started to pick up temp and started pinging badly, so I just shut i down. This with a fuel that would pass tech inspection for 25%.
So my guess is that OS plugs are quite HOT!

I think there are some bad fuels on the market as well and in general I think many of the US-brand fuels are more well tested as your market is bigger.
But I know of one US-made fuel that I wouldn't touch either so there are probably both good and bad fuel on both sides of the Atlantic.
Best bet is probably to buy a small batch and see for your self.

Yep I agree, we would always go to a hotter plug if things are bit iffy, however, we really struggled with the F11 in the beginning, we would get phantom flalme outs and wierd idles.

We started with a RB 6 and I slowly increased to hotter and hotter plugs as our frustrations grew.

However, the hotter I went the worse the idle and flame outs got. So in the end I stuck a RB 7 plug (out of desperation) in and all issues we gone. Perfect idle huge top end and pretty good mileage to boot.

Did the same to the B11 and got the same result.

Our condition here a pretty warm (summer here right now in Australia) highs of around 30 degrees plus and high humidity. However, I have also run this plug down in temps of around 15 degrees and it still is awesome.

We run 30% nitro.

Cheers

Mark

All the talk about the RB's using the Rb 6 glow plug, or using hotter plugs is kinda funny, 10 or so years ago, racing in 'California, with the RB S7 Europa, standard plug, turbo plugs at that time were only used on the on road engines, and if you were running RB's, you were using an Rb 8 plug, and that was all everyone used on RB engines, then you had to be on tune, or you were not racing. I had met Steve O'donnell soon after, and I ask why we did not use a hotter plug, his answer was, people that use hot plugs can't tune. This was the Nova Rossi based engines, not other engines he was speaking of.

Most of us are running RB 25% fuel.
I do not think it is a problem of bad fuel.
It is more that just one "experienced" guy started with the p3 plugs and the rest followed.
I will try both C5TGC and C6TGC plugs in my new engine.

Our RB teamdrivers mostly use RB No.6
Don't know why everybody just uses the 6 and does not try the 5.

There's nothing wrong with Tornado fuel. It's very well established and is used all over the place - by all kinds of experienced and sponsored people. Furthermore, I run it and have run it in about eight other engines, all of which run perfectly. Further-furthermore..., it already costs €11 per liter, and I can buy it just up the road. I am simply not going to switch to some other fuel that costs €15+ per liter and can only be had if you're lucky an hour away. Period. If that's what running an RB requires then I'll be selling this Fire 11 in short order and picking up the new Argus B52 instead... Just saying.

You're funny...
Just run that f11
I know enough people who run it with p3 and rb 6
One question: have you ever ran that f11 ?

Naa.. Just got it at X-mas time in a deal with a new buggy.. It's not even really an appropriate buggy engine by most accounts.. I just wanted something silly powerful, and the deal was good.. Might end up in my SC8, DM-1, or the buggy... But it being winter, it might take a bit til I get around to break-in..