ALRIGHT. I know there's tons of theories regarding this. I know that the point of selecting different temperature plugs is to control the combustion point of the engine. What I would like someone to explain to me is, what conditions should I look for when deciding to go with a hotter or colder plug? By conditions I mean engine performance or even how it sounds. I know the atmospheric conditions also have soemthing to do with it. What should I look for? I live in Miami where we race in the 90's and my track is particularly humid most of the time on all but the CLEAREST of days. As for the engine, in case anyone has experience with it, it's a JP FX12 t03 (non-modded) and i'm using 30% nitro. My LHS suggested I fool around with Novarossi 6C and 7C plugs for the most part. The factory plug on the engine is a 6C. Thanks in advance and let the suggestions ROLL IN.

Hi Gonzo, here you have it.

The numbers and characters on the plugs, are the product number, wire thickness, and thermal range of the plug’s body. Example: The Mega Turbo 2315 6TF

Product Number: 2315
Wire Thickness: 6
Plug Type: T (Turbo)
Thermal Range: F (Fredda)(Cold)

The plugs with cold thermal range F(Fredda), have a body with thinner walls, so they dissipate heat better and faster to the engine head. So because of that:

·When the ambient temperature is high, we have to use a plug with thicker wire.
·Humidity determines if we use a Cold (F) thermal range, or Hot (C)(Calda) thermal range.
·With high humidity percentage we should use a Hot (C) thermal range plug.
·If we have high temperature and high humidity, we should use a plug with thick wire and a Hot(C) thermal range.

The best instrument to determine which Turbo Plug to use, is those weather panels they sell for Yachts, that have Temp, Humidity and Barometric Pressure on them. Have it calibrated at your local weather station, and bingo, you’re ready like the Pros.
That is the key to success or failure tuning engines with Turbo Glow Plugs, because they are so sensitive to weather variations that is unbelievable.

Following is a selection chart for Novarossi Turbo Glow Plugs:

Type Thermal Range Nitro% Temp.C Humidity%

C5TC Hot/hot wire 10-20 0-10 70-100
C6TC Hot/average wire 10-20 10-16 70-100
C7TC Hot/cold wire 20-30 16-25 70-100
C8TC Hot/ultra cold wire 20-30 25-up 70-100
C5TF Cold/hot wire 20-30 0-10 40-70
C6TF Cold/average wire 20-30 10-15 40-70
C7TF Cold/cold wire 20-up 16-25 40-70
C8TF Cold/ultra cold wire 20-up 25-up 40-70

Hope this helps

AFM

THIS IS AWESOME! Thanks AFM. Anyone else have any thoughts?

You think that is impressive!!!! Try the ultimate in tuning. Use an odonnell turbo plug. He only makes one .12 turbo plug. Therefore no matter what the temp, humidity, nitro, planetary alignment, plutonium half-life, gravitational pull, or even whoever wins this years Tour de France...... you have the right plug in the engine.


I am not making fun of you, I am just trying to have some myself. Yes, he does only make one plug in each category. 1/8th standard, 1/8th turbo, 1/10th standard, and 1/10th turbo. All work quite well (haven't tried the 1/8th turbo yet)

hey gonzoy5 he is right ! i have run the odonnell plug for months with no problems..i guess no-more mt12, i will have to hug those turns tighter...

Yeah I've read about the Odonnel plugs and even used em on my non turbo engine. Never thought about using it for the turbo just cause I figured there HAS to be a reason why there are so many. I'll have to give it a try soon.


Is that you Howard? Hopefully i'll get by you before the turn even comes up with this engine. I'll be out there on Sunday breaking it in. But I'l always have that MT12 out there just in case that baby still has plenty of life left see you in a few weeks.

yes it is, i had too many choices with 5-6-7 hot ? cold ? just easier to tune. cant make it this sunday see you the 25th at the final race wish i had time to practice

Anyone else have any thoughts? How about any of you engine modders?

Where can I buy Odonell turbo plug's on line? I only see the 77 and 99 plugs listed.

I hate to say this, but try call O'Donnell manufacturing and ask them where to get the plugs.

FYI, the part number are the same you just add a T.

ie... 77t, and 99t.