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Discussion Starter · #1 ·
Hi folks...

I have a zetec turbo and i need colder spark plugs than my stock NGK-TR6B-10
anyone knows a 9 heat range spark plug that is plug n play with the zetec engine??

I'm planning to install a TR7B-10 spark plugs. They are original from Ford Zetec Rocam Supercharger. But they still are too hot.
So i'll have to run on a richer a/f ratio... and this is no good... hehehe
Does anyone knows more tech info about the SVT spark plugs??

Thanks!
 

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ford changed the part number to SP463
 

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RushdB said:
Hi folks...

I have a zetec turbo and i need colder spark plugs than my stock NGK-TR6B-10
anyone knows a 9 heat range spark plug that is plug n play with the zetec engine??

I'm planning to install a TR7B-10 spark plugs. They are original from Ford Zetec Rocam Supercharger. But they still are too hot.
So i'll have to run on a richer a/f ratio... and this is no good... hehehe
Does anyone knows more tech info about the SVT spark plugs??

Thanks!
First get away from the NGK plugs , Second the heat range of the plug has little to nothing to do with AF

How much boost are you running and what are you trying to do?

I machine some VERY cold ranges of plugs for the Zetec there 20.00 each

Tom
 

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Discussion Starter · #5 ·
I'm using 0.8 bar ( i guess 0.8 bar = 11 psi ).
The engine has stock componentes, it is a Zetec Rocam 1.6L. I guess this engine does not exist in USA. But, the spark plugs are compatible.
The stock engine use those NGK TR6B-10, that are 6 heat range with 10mm of gap ( 0.040 in ).
The new fuel is etanol ( not methanol ). Stock is gasoline.

Using the 7 heat range spark plugs (0.25 in gaped), i'll run a richer a/f ratio. Doing this, i guess i'll avoid pre-ignition, because the extra fuel makes the combustion chamber colder.
It's like that, a lean af ratio melt the pistons, so a rich af ratio could make it colder...

The azfs22c spark plugs ( SP463 ) can be used in Zetec 1.8 16v? What is the heat range of those plugs?

thanks guys!!
Sorry for my bad english!
 

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The US Zetec takes a 1 inch reach (.980) not sure what reach your rocam engine takes that would be the first thing i would check

The heat range of the plug DOES NOT set the heat in the combustion chamber DONT confuse the plugs heat range with the internal Cyl temp

With 11psi 1 to 2 heat ranges is all you need to go , what is the rated octane of your fuel

Tom
 

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Hey Tom, what plugs do you suggest for 15 lbs on an SVT, and what to gap them to. Runnin 93 octane. Sorry to hijack, just didnt want to start a whole new thread.
 

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Discussion Starter · #9 ·
1turbofocus said:
The US Zetec takes a 1 inch reach (.980) not sure what reach your rocam engine takes that would be the first thing i would check

The heat range of the plug DOES NOT set the heat in the combustion chamber DONT confuse the plugs heat range with the internal Cyl temp

With 11psi 1 to 2 heat ranges is all you need to go , what is the rated octane of your fuel

Tom
Sorry, i tought "gap" was the distance between the eletrode and the "tip" of the plug... It's almost 1 inch the length of the spark "screw"... i hope you understand what i'm trying to say...

Alcohol is rated at 110 octanes... But i'm not using a intercooler ( there is no free space to fit it... and i'll not cut my hood ), so i was wondering about using the 8 heat range plugs. The original plugs are rated at 6.

I know the heat range does not set the heat... But using a wrong plug ( hot ), the only way to avoid pre-ignition is running on a richer af ratio...
 

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Discussion Starter · #10 ·
Hey, the gap is what i tought it were... ehehehhe...
The original gap is 1,0mm, i'm runnig 0,6mm now.
The diameter of the plug is 14mm. Lenght is 1 inch ( 25mm ). and the "wrench" size is 16mm. There is a note in the NGK table saying that this plug has a conical "sitting"... dont know how to translate this...

i guess this is the same plug size of the SVTs...
 

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If your running 110 octane all the time then the stock plugs for 11psi will be fine , i wouldnt go much more then 2 head ranges with 110 octane , the bigger the gap the better TQ until you get a misfire , i would start at about .045 gap

Tom
 

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Discussion Starter · #12 ·
I've just bought 1 heat range colder than stock... NGK TR7B-10 plugs.
And they are the most simple product line of NGK, they aren't even the V.Power... Just "regular" plugs.

Where can i find better plugs?! Does the iridium plugs worth the money? Or should i use the AZFS22C plugs?? Do tou know the heat range of the AZFS22C??
 
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