Murnan Modified Motors
#2026
Tech Initiate
THANKS URIAH
DANIEL MAZZARA
DANIEL MAZZARA
#2027
The numbers and characters on the plugs, are the product number, wire thickness, and thermal range of the plug’s body. Example: The Novarossi C6TG (F) or (C)
Product: C (Conical)
Wire Thickness: 6
Plug Type: T (Turbo)
Plated: G (Gold)
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 dissipate heat better and faster 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 (F) thermal range, or Hot (C) 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.
AFM
Product: C (Conical)
Wire Thickness: 6
Plug Type: T (Turbo)
Plated: G (Gold)
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 dissipate heat better and faster 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 (F) thermal range, or Hot (C) 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.
AFM
#2028
CORRECTION
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 it slower to the engine head. The number of threads is the same on both types of plugs.
AFM
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 it slower to the engine head. The number of threads is the same on both types of plugs.
AFM
#2032
Tech Elite
iTrader: (15)
Hi all I ran my murnan 353 on the weekend and all i can say is this engine has HUGGEE power, the only downside was the low grip tracki conditions because we normally spray VHT
cant wait to try it again with high grip! i couldnt power on in the turns without frying tires
cant wait to try it again with high grip! i couldnt power on in the turns without frying tires
#2034
Hi Uriah,
below is a question that I also posted in the Siro thread, but I figured that you are probably the best man to ask this question, since you"ve worked a lot with Sirio engines:
"I just received my very first Sirio engine,a .12 Evo4 STI.
I took it apart and everything looks very nice, but one thing caught my attention.
The head button sits very loosely in the sleeve and has some considerable play.
Is this normal?
I am used to Picco and NR engines, where you can only pull the button out of the sleeve when the plug is removed, and even then the stick pretty tight.
Also, the Sirio head button has a groove around the part that goes into the sleeve. Is that there to seal?
I can only imagine,that the button expands so heavily that it"ll seal correctly once the engine is hot, otherwise I would expect major blow by.
Thanks for your input."
Thanks buddy!
below is a question that I also posted in the Siro thread, but I figured that you are probably the best man to ask this question, since you"ve worked a lot with Sirio engines:
"I just received my very first Sirio engine,a .12 Evo4 STI.
I took it apart and everything looks very nice, but one thing caught my attention.
The head button sits very loosely in the sleeve and has some considerable play.
Is this normal?
I am used to Picco and NR engines, where you can only pull the button out of the sleeve when the plug is removed, and even then the stick pretty tight.
Also, the Sirio head button has a groove around the part that goes into the sleeve. Is that there to seal?
I can only imagine,that the button expands so heavily that it"ll seal correctly once the engine is hot, otherwise I would expect major blow by.
Thanks for your input."
Thanks buddy!
#2035
I had a jp mod .12 were the head button was loose in the sleeve it never showed any signs of leaking. The shims are soft enough to make a good seal.
#2036
Tech Elite
iTrader: (52)
Hi Uriah,
below is a question that I also posted in the Siro thread, but I figured that you are probably the best man to ask this question, since you"ve worked a lot with Sirio engines:
"I just received my very first Sirio engine,a .12 Evo4 STI.
I took it apart and everything looks very nice, but one thing caught my attention.
The head button sits very loosely in the sleeve and has some considerable play.
Is this normal?
I am used to Picco and NR engines, where you can only pull the button out of the sleeve when the plug is removed, and even then the stick pretty tight.
Also, the Sirio head button has a groove around the part that goes into the sleeve. Is that there to seal?
I can only imagine,that the button expands so heavily that it"ll seal correctly once the engine is hot, otherwise I would expect major blow by.
Thanks for your input."
Thanks buddy!
below is a question that I also posted in the Siro thread, but I figured that you are probably the best man to ask this question, since you"ve worked a lot with Sirio engines:
"I just received my very first Sirio engine,a .12 Evo4 STI.
I took it apart and everything looks very nice, but one thing caught my attention.
The head button sits very loosely in the sleeve and has some considerable play.
Is this normal?
I am used to Picco and NR engines, where you can only pull the button out of the sleeve when the plug is removed, and even then the stick pretty tight.
Also, the Sirio head button has a groove around the part that goes into the sleeve. Is that there to seal?
I can only imagine,that the button expands so heavily that it"ll seal correctly once the engine is hot, otherwise I would expect major blow by.
Thanks for your input."
Thanks buddy!
I have a EVO4 from Murnan, mine had a very small amount of play, but nothing worth worrying about.
The head button on my 353 Murnan was much tighter, and often needed alittle force to get out.
Obviously, I do not have to worry about this with the newer Sirio XXX because of its newer head design
Michael.
#2038
Hi Uriah,
below is a question that I also posted in the Siro thread, but I figured that you are probably the best man to ask this question, since you"ve worked a lot with Sirio engines:
"I just received my very first Sirio engine,a .12 Evo4 STI.
I took it apart and everything looks very nice, but one thing caught my attention.
The head button sits very loosely in the sleeve and has some considerable play.
Is this normal?
I am used to Picco and NR engines, where you can only pull the button out of the sleeve when the plug is removed, and even then the stick pretty tight.
Also, the Sirio head button has a groove around the part that goes into the sleeve. Is that there to seal?
I can only imagine,that the button expands so heavily that it"ll seal correctly once the engine is hot, otherwise I would expect major blow by.
Thanks for your input."
Thanks buddy!
below is a question that I also posted in the Siro thread, but I figured that you are probably the best man to ask this question, since you"ve worked a lot with Sirio engines:
"I just received my very first Sirio engine,a .12 Evo4 STI.
I took it apart and everything looks very nice, but one thing caught my attention.
The head button sits very loosely in the sleeve and has some considerable play.
Is this normal?
I am used to Picco and NR engines, where you can only pull the button out of the sleeve when the plug is removed, and even then the stick pretty tight.
Also, the Sirio head button has a groove around the part that goes into the sleeve. Is that there to seal?
I can only imagine,that the button expands so heavily that it"ll seal correctly once the engine is hot, otherwise I would expect major blow by.
Thanks for your input."
Thanks buddy!
I am not familiar with the groove cut into the head button. Maybe you can post a photo.
#2039