Spark plugs for heads/cam car?
Spark plugs for heads/cam car? I currently have NGK TR55s in the car. I've had them for about 10k miles.
With my heads/cam package in sig, I'm running over 11:1 compression.
Should I switch to a TR6 plug?
If so, what gap should I use?
No nitrous or other engine mods planned.
With my heads/cam package in sig, I'm running over 11:1 compression.
Should I switch to a TR6 plug?
If so, what gap should I use?
No nitrous or other engine mods planned.
Most thing's I've read here say TR55 for N/A and TR6 for nitrous.
But.....
http://www.ngksparkplugs.com/techinf...00&country=US#
Higher Compression Ratios/Forced Induction will elevate spark plug tip and in-cylinder temperatures
Compression can be increased by performing any one of the following modifications:
a) reducing combustion chamber volume (i.e.: domed pistons, smaller chamber heads, mill ing heads, etc.)
b) adding forced induction (Nitrous, Turbocharging or Supercharging)
c) camshaft change
As compression increases, a colder heat range plug, higher fuel octane, and careful attention to igni-tion timing and air/fuel ratios are necessary. Failure to select a colder spark plug can lead to spark plug/engine damage
But.....
http://www.ngksparkplugs.com/techinf...00&country=US#
Higher Compression Ratios/Forced Induction will elevate spark plug tip and in-cylinder temperatures
Compression can be increased by performing any one of the following modifications:
a) reducing combustion chamber volume (i.e.: domed pistons, smaller chamber heads, mill ing heads, etc.)
b) adding forced induction (Nitrous, Turbocharging or Supercharging)
c) camshaft change
As compression increases, a colder heat range plug, higher fuel octane, and careful attention to igni-tion timing and air/fuel ratios are necessary. Failure to select a colder spark plug can lead to spark plug/engine damage
Launching!
Joined: Mar 2002
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Originally Posted by silverTA2002
Anyone have thoughts on this?
I can't be the first heads/cam guy to change plugs.
I can't be the first heads/cam guy to change plugs.
Yea, me too, I have often wondered if I needed to go 1 colder w/a h/c setup.
I went with TR5's. They are the same as TR55's, but come gapped smaller to begin with. See if a TR55 is gapped at .055, the spark plug electrode shouldn't be moved +/- .010. Some do it anyway but I digress. So if you want lower than .045, the Tr5 works well. I have TR5's gapped at .039, and run 11:1 compression.
BTW, this advice came from patman, so kudos go to him.
However, in reviewing my spark plugs, the white portion is light pink. Not 100% sure what that means. This quote: "Today’s pump gas may use additives that cause a discoloration of the plug core nose; they could be pink, purple, or blue. Do not consider this coloration as an indication of heat range when reading spark plugs." from here: http://www.carcraft.com/techarticles/64378/ makes me not worry too much about the color.
BTW, this advice came from patman, so kudos go to him.
However, in reviewing my spark plugs, the white portion is light pink. Not 100% sure what that means. This quote: "Today’s pump gas may use additives that cause a discoloration of the plug core nose; they could be pink, purple, or blue. Do not consider this coloration as an indication of heat range when reading spark plugs." from here: http://www.carcraft.com/techarticles/64378/ makes me not worry too much about the color.
Last edited by Viper; Apr 1, 2006 at 08:23 AM.
Im starting to buy a list of parts for my head swap. This is what I will have, small cam .522 216/220 dur, TEA stage 1 heads at 61cc chamber, with all the bolt ons on a stock cube motor. I was recommended this by ngk by email.
Hello,
> >
> >I would recommend the TR6IX stock no. 3689. This plug comes gapped to
.040. If you plan on opening it, go no more than to .050 and do so
carefully as it is a fine wire design center firing electrode and can be
broken.
> >
> >Jon MacQuarrie
> >Motorsports and Events Coordinator
> >Aftermarket Division
> >NGK Spark Plugs (U.S.A.), Inc.
> >46929 Magellan Drive
> >Wixom, MI 48393
> >(248) 926-6313 Direct Dial
> >(248) 705-1485 Cell
> >(248) 926-6938 Fax
Hello,
> >
> >I would recommend the TR6IX stock no. 3689. This plug comes gapped to
.040. If you plan on opening it, go no more than to .050 and do so
carefully as it is a fine wire design center firing electrode and can be
broken.
> >
> >Jon MacQuarrie
> >Motorsports and Events Coordinator
> >Aftermarket Division
> >NGK Spark Plugs (U.S.A.), Inc.
> >46929 Magellan Drive
> >Wixom, MI 48393
> >(248) 926-6313 Direct Dial
> >(248) 705-1485 Cell
> >(248) 926-6938 Fax
Trending Topics
I emailed NGk about this very question. They said for 100HP boost go one range colder. It doens't matter if the 100HP is from nitrous or high compression and a big cam. They told me to run TR6s for my head and cam car.
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Originally Posted by ssheets
I emailed NGk about this very question. They said for 100HP boost go one range colder. It doens't matter if the 100HP is from nitrous or high compression and a big cam. They told me to run TR6s for my head and cam car.
Kinda interesting, because it seems to be "contrary to popular belief" on this board.
Here, almost everything I've read (search feature) says to stick with the TR55s for heads/cam cars.
So, if it's true that the TR6 would be better, I'd consider that VERY helful info.
Has anyone here been using the TR6 on a heads/cam car and had a problem with them "fouling?"
Originally Posted by silverTA2002
Has anyone here been using the TR6 on a heads/cam car and had a problem with them "fouling?"
I know this thread is old but at least I used the search button.
I after reading several threads I have still to find an answer.
I have a head/Cam/intake/Exhasut car running 11:1 compression. I have both Tr5's and Tr6's.
Which plug should I run and what should I gap it to??
I after reading several threads I have still to find an answer.
I have a head/Cam/intake/Exhasut car running 11:1 compression. I have both Tr5's and Tr6's.
Which plug should I run and what should I gap it to??
I ran the TR55 plugs when I had all the bolt ons and a cam with stock heads...when I went to the high compression heads (11.5-1)and a different cam I started using the TR6 plugs...both work great and have the correct color when I pull them.