Spark plugs, projected vs non-projected

EDGE Motorsport

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Sep 24, 2004

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Saleen S281, London, UK

Sep 15, 2005

#1

• Sep 15, 2005

• #1

When do you use spark plugs with a projected tip as opposed to a non-projected tip ?

will one fit and another not ?

Im just about to order some plugs one range colder and wasnt sure which to get, TR6 (projected) or BR6EF(non-projected) ?!?!?

Any ideas anyone ???

EDGE

 

forpit2000gt

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#2

• Sep 15, 2005

• #2

both will fit. the thread lengths are different. Get the BR6EF and it will have the shorter threads. The TR6 will still work ,although I don't know if it is a resistor plug, the BR6ef is.FYI, Br7 is 2 steps colder.

 

EDGE Motorsport

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Sep 16, 2005

#3

• Sep 16, 2005

• #3

as far as i know theyre both non-resistor, the reach is the same at 0.708" and the threads are the same.

it looks like the only difference is the tip ???

thanks for the advice dude,

EDGE

 

forpit2000gt

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#4

• Sep 16, 2005

• #4

B= 14mm thread
R= Resistor
6= heat range
E= 19mm Thread reach
F= taper seat/ no gasket

I found a TR6 here, it has the long threads. do you have a picture? I am interested to find out more. Does the BR6EF have the groove?

 

EDGE Motorsport

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Sep 16, 2005

#5

• Sep 16, 2005

• #5

oh right...

ok...that confuses me even more now...

on sumit's site they list both as non resistor..

does the tr6 fit the non pi motor (with stock heads) ??

Im as interested to find out more as you are dude..

EDGE

 

forpit2000gt

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#6

• Sep 16, 2005

• #6

http://www.spark-plugs.co.uk/pages/technical/ngkjpg.htm
right off the NGK web site.
.750 thread depth pre 99
.708 thread depth 99+( PI ) not SVO
either plug will work, I have not been educated on projected or no projected tips or the term.

 

EDGE Motorsport

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Sep 24, 2004

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Saleen S281, London, UK

Sep 17, 2005

#7

• Sep 17, 2005

• #7

hmmmmmm...

so the plugs both recommended to me by modular power house are resistor types and so are the ones in the car (bpr6efs)..... but they are a projected tip... not what MPH recommend ??

ok, now just 2 questions remain..

why would you use a projected tip plug (is it in higher compression engines it keeps the plug out of the way of the piston[clutching at straws here])???

why would you choose a resistor type plug over a non-resistor type...

anyone got any pearls of wisdow to share...

EDGE

 

forpit2000gt

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Sep 18, 2005

#8

• Sep 18, 2005

• #8

neither plug will make contact with the piston in any way unless you have serious problems. Resistor plugs reduce noise back to the computer and electrical system. Example would be without a resistor plug, turn on the radio and a buzz in the speakers that would go up and down with the revs of ther engine. There is more to it but not important.
I still haven't found out what projected or non-projected plugs are. What did MPH recommend?
What exactly did MPH recommend?

 

K

Kilgore Trout

Fried or Broiled ?

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Sep 18, 2005

#9

• Sep 18, 2005

• #9

Ford changed the recommended plug. Everyone suspects it is because of spark plug blowout. There's a good article on the fabulous Bullitt Archive:
http://www.bullittarchive.com/html/modules/articles/article.php?id=118

 

EDGE Motorsport

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Sep 24, 2004

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Saleen S281, London, UK

Sep 19, 2005

#10

• Sep 19, 2005

• #10

well, mph recommended a tr6 plug..

this (going from ngk's de-coder) is a tapered seat, resistor, 6 (one step colder)

so thats what i guess i'll order.. (on summits site though, it says these tr6s are rojected tips)

I guess i'll try the tune first with the plugs i have in there at the moment though (bpr6efs) as the credentials are the same as the tr6..

thanks for all the help guys...

EDGE

 

forpit2000gt

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Sep 20, 2005

#11

• Sep 20, 2005

• #11

EDGE Motorsport said:

well, mph recommended a tr6 plug..

this (going from ngk's de-coder) is a tapered seat, resistor, 6 (one step colder)

so thats what i guess i'll order.. (on summits site though, it says these tr6s are rojected tips)

I guess i'll try the tune first with the plugs i have in there at the moment though (bpr6efs) as the credentials are the same as the tr6..

thanks for all the help guys...

EDGE

Click to expand...

When you get the plugs will you list the thread depth? I wonder if that has changed, I have a set that was purchased a couple of years ago.
Long threads, short threads, they both bottom out at the same point and do not go farther into the head. remember to use anti sieze on the threads.

 

EDGE Motorsport

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Sep 24, 2004

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Saleen S281, London, UK

Sep 20, 2005

#12

• Sep 20, 2005

• #12

yeah, when i get the plugs ill mesure them up and append to this thread..

thanks again

EDGE