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Old 08-24-2009, 08:00 AM   #1
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Default Picco Glowplugs

Can anyone tell how the picco numbering works with there glowplugs
What is the difference between a P7TH and P6TH (i gather TH means Turbo Hot and TC Turbo Cold ) but what is the difference between P7 and P6
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Old 08-24-2009, 08:03 AM   #2
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#6 is hotter than #7
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Old 08-24-2009, 08:18 AM   #3
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5 is hot, 6 is medium (still pretty hot) 7 is cold and 8 is really cold.

Plus you have long and short bodied plugs. Long bodied plugs are a bit hotter, so a long bodied 7 will be hotter than a short bodied 7 using the same wire for both. Not sure what Picco's letter designation is for those but that is what the different letters mean.
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Old 08-24-2009, 08:35 AM   #4
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So for a Picco 12 Evo 4 what plug would you use
for the 21 I was told to use a 7 cold
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Old 08-24-2009, 08:41 AM   #5
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12's I like 6's for most conditions. Really long and really hot maybe a 7, cold as hell on a short track, maybe a 5.
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Old 08-24-2009, 08:41 AM   #6
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Quote:
Originally Posted by tao3 View Post
So for a Picco 12 Evo 4 what plug would you use
for the 21 I was told to use a 7 cold
John
P6TH or IDM#6
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Old 08-24-2009, 08:42 AM   #7
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you want to use a p6tc. That is the stock plug that the evo 3 came with.
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Old 08-24-2009, 08:50 AM   #8
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So what would the differance be between TH and TC

Thanks
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Old 08-24-2009, 08:55 AM   #9
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Quote:
Originally Posted by wingracer View Post
5 is hot, 6 is medium (still pretty hot) 7 is cold and 8 is really cold.

Plus you have long and short bodied plugs. Long bodied plugs are a bit hotter, so a long bodied 7 will be hotter than a short bodied 7 using the same wire for both. Not sure what Picco's letter designation is for those but that is what the different letters mean.
Wingracer explaned it here, the TH is turbo hot so a long body plug and the TC is turbo cold short body plug
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Old 08-24-2009, 09:02 AM   #10
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Thanks everyboby for their help I understand now (wish it was written somewhere

Thanks
John
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Old 10-17-2009, 11:30 PM   #11
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what about for a picco p3 .28?
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Old 10-19-2009, 04:07 PM   #12
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I would think a 7 but it would depend on what % nitro your running
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Old 10-19-2009, 04:48 PM   #13
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Quote:
Originally Posted by tao3 View Post
Thanks everyboby for their help I understand now (wish it was written somewhere

Thanks
John
The numbers and characters on the plugs, are the product number, wire thickness, and thermal range of the plug’s body. Example: The Picco 7TH or
7TC
 Wire Thickness: 7
 Plug Type: T (Turbo)
 Thermal Range: C = Cold, H = Hot. In Italian it would be F(fredda) = cold, and C (calda) = Hot

The plugs with cold thermal range, have a body with thinner walls and shorter body, so they dissipate heat better and faster to the engine head. The plugs with hot thermal range, have a body with thicker walls and longer body, so they retain heat and dissipate heat slower to the engine head. The number of threads is the same on both types of plugs.

How to select the proper plug:
• When the ambient temperature is high, we have to use a plug with thicker wire.
• With higher compression, we have to use a plug with thicker wire.
• Humidity determines if we use a Cold thermal range, or Hot thermal range.
• With high humidity percentage we should use a Hot thermal range plug.
• If we have high temperature and high humidity, we should use a plug with thick wire and a Hot thermal range.

The best instrument to determine which Turbo Plug to use, are those digital weather stations, that have Temperature, and Humidity. 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.

AFM
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Old 10-21-2009, 09:20 AM   #14
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In the novarossi world yes, H means cold.

Picco although Italian, TH means the short bodied hot plug. www.nitrohouse.com is a great place to get picco plugs and they show the package, the 6tc says cold on it.

I run the IDM variant but I imagine it is the same for all, I run the 6TH (or IDM6) everywhere all the time in the 12 evo3 and evo4. I run the 7TH (or IDM7) in the 21 for onroad and a 5TC (IDM5something odd) for offroad.

I don't believe in changing glow plugs even from when I break an engine in, with the 12 evo3 I usually go through 3-4 rods before the plug eventually pops. The evo4 I'm told has a superior rod so I guess it will go 3-4 gallons before the plug pops and it will eventually but I haven't had it happen so I don't know as I am still on the same plug with 2 gallons from nationals.
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Old 10-21-2009, 06:42 PM   #15
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[QUOTE=Brian Bosley;6501844]In the novarossi world yes, H means cold.

Picco although Italian, TH means the short bodied hot plug. www.nitrohouse.com is a great place to get picco plugs and they show the package, the 6tc says cold on it.

QUOTE]

In Novarossi world, it goes like this
Example: The Novarossi C6TG (F) or (C)
 Product: C (Conical)
 Wire Thickness: 6
 Plug Type: T (Turbo)
 Plated: G (Gold plated)
 Thermal Range: F (Fredda = Cold) C (Calda = Hot)

The plugs with cold thermal range F (Fredda), have a body with thinner walls and shorter body, so they dissipate heat better and faster to the engine head.
The plugs with hot thermal range C (Calda), have a body with thicker walls and longer body, so they retain heat and dissipate heat slower to the engine head.

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