Lets Talk heat range of spark plugs

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Lets Talk heat range of spark plugs

Post  t-bird racer on July 15th 2015, 12:02 pm

I have been running the NGK R5673-10. My combo is a 521 BBF naturally aspirated. This plugs have been the only plug I have had since the dyno
pulls and tuning a few years back by my engine builder. Everything I read says these plugs are meant to be used in high boost/nitrous applications.

Would a set of #9's or 8's be better suited for a drag race application? How would this effect the tune up/ performance of the engine. I have not been
having trouble just curious as to the difference.

Any and all comments are welcome.
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Re: Lets Talk heat range of spark plugs

Post  whatbumper on July 15th 2015, 12:21 pm

What do they look like?

That is a colder plug than what most people run NA.

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Re: Lets Talk heat range of spark plugs

Post  gt350hr on July 15th 2015, 12:30 pm

That is the coldest plug offered. I ran it on a cast iron head with 14-1 c/r and it was fine. I tried a -9 and it showed some overheating. For an aluminum head and or less compression ratio , I would look at a hotter plug.

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Re: Lets Talk heat range of spark plugs

Post  t-bird racer on July 15th 2015, 1:52 pm

It's an Aluminum Headed engine around 13 to 1 compression.

I'm just not that good at reading plugs.
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Re: Lets Talk heat range of spark plugs

Post  kim on July 15th 2015, 1:55 pm

I run that plug with alinum heads 17-1 compression and a 500 shot.

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Re: Lets Talk heat range of spark plugs

Post  cool40 on July 16th 2015, 12:48 am

The 8 works in most NA setups.
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Re: Lets Talk heat range of spark plugs

Post  gt350hr on July 16th 2015, 11:06 am

+1 I would use a -8 on an aluminum head with 13-1. The aluminum head sucks heat out of the plug far better than an iron head does and is the reason a warmer plug can be used.

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Re: Lets Talk heat range of spark plugs

Post  t-bird racer on July 18th 2015, 9:02 pm

Truly,

I can't recall any color on the plugs they stay pretty clean.  I have not spent too much time racing the last few years, so trying to
remember.  It seemed that it started a little hard, maybe a hotter plug would help it fire quicker on start up.

I remember that i would warm the car, on a old set of plugs and then put fresh plugs in before my time runs.

I think I got -10 because that's what the shop had and i never tried any other plugs..

Thanks for the help.
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Re: Lets Talk heat range of spark plugs

Post  whatbumper on July 18th 2015, 11:01 pm

cool40 wrote:The 8 works in most NA setups.

Agreed

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Re: Lets Talk heat range of spark plugs

Post  away on July 20th 2015, 9:29 am

How would these compare to a Autolite Racing plug? How do these numbers cross reference?
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Re: Lets Talk heat range of spark plugs

Post  rmcomprandy on July 20th 2015, 10:11 am

away wrote:How would these compare to a Autolite Racing plug?  How do these numbers cross reference?

Something like an AR12

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Re: Lets Talk heat range of spark plugs

Post  cool40 on July 20th 2015, 7:42 pm

away wrote:How would these compare to a Autolite Racing plug?  How do these numbers cross reference?
we had a new set of autolite racing plugs that would hardly run. Searched for the problem a while before figuring it out. They looked like a bad monday morning job or autolite may be buying from china? Replaced with ngk-9 and it sounded normal again. Cool  so we wont be useing autolite plugs anymore.   https://2img.net/h/i206.photobucket.com/albums/bb173/nbjuljetta02/Spark-Ref.jpg


Last edited by cool40 on July 20th 2015, 7:49 pm; edited 2 times in total
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Re: Lets Talk heat range of spark plugs

Post  Lem Evans on July 20th 2015, 7:45 pm

cool40 wrote:
away wrote:How would these compare to a Autolite Racing plug?  How do these numbers cross reference?
we had a new set of autolite racing plugs that would hardly run. Searched for the problem a while before figuring it out. They looked like a bad monday morning job or autolite may be buying from china? Replaced with ngk-9 and it sounded normal again. Cool  so we wont be useing autolite plugs anymore.

Did you run a plugfax on them....could be a salvage title deal Wink

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Re: Lets Talk heat range of spark plugs

Post  cool40 on July 20th 2015, 8:42 pm

Lem Evans wrote:
cool40 wrote:
away wrote:How would these compare to a Autolite Racing plug?  How do these numbers cross reference?
we had a new set of autolite racing plugs that would hardly run. Searched for the problem a while before figuring it out. They looked like a bad monday morning job or autolite may be buying from china? Replaced with ngk-9 and it sounded normal again. Cool  so we wont be useing autolite plugs anymore.

Did you run a plugfax on them....could be a salvage title deal Wink
these were new,in the box,OEM autolite racing plugs but looked about as quality as a champion! Razz
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Re: Lets Talk heat range of spark plugs

Post  away on July 21st 2015, 1:43 pm

I was also told that Auto-lite plugs went to china! So you are probably right.

So what would the recommendation be for a naturally aspirated bracket car methanol injection. TFS street head

Thanks
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Re: Lets Talk heat range of spark plugs

Post  cool40 on July 21st 2015, 5:24 pm

away wrote:I was also told that Auto-lite plugs went to china!  So you are probably right.

So what would the recommendation be for a naturally aspirated bracket car methanol injection.  TFS street head

Thanks
ngk #8 is what I run.
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Re: Lets Talk heat range of spark plugs

Post  gmsmkr on July 22nd 2015, 10:31 pm

We also use #8 in N/A stuff and even in some small nitrous stuff
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Re: Lets Talk heat range of spark plugs

Post  away on July 23rd 2015, 10:39 am

NGK Spark Plugs R5671A-8 - NGK Racing Spark Plugs

Autozone part number 4554?

Is this the part number?
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Re: Lets Talk heat range of spark plugs

Post  gmsmkr on July 23rd 2015, 5:32 pm

away wrote:NGK Spark Plugs R5671A-8 - NGK Racing Spark Plugs

Autozone part number 4554?

Is this the part number?


Yes
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Re: Lets Talk heat range of spark plugs

Post  t-bird racer on July 30th 2015, 2:43 pm

So,

Here is a follow up question.  I normally run the -10 with 87 Carb Jets.  If I switch to the hotter -8 should I go up a jet
or two to accommodate the hotter plugs??????
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Re: Lets Talk heat range of spark plugs

Post  kim on July 30th 2015, 3:20 pm

Fuel should have been right regardless the plugs temp.  Most noticable diffrence will be start up.  Crisper

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Re: Lets Talk heat range of spark plugs

Post  t-bird racer on September 8th 2015, 3:28 pm



Well I finally was able to make a few passes and the car ran pretty consistent.   Here is a picture of the #5 cylinder after my first time run. These are the #8 NGK's.   I did have to idle  a bit on the way back to the pits.  Any and all comments are welcome.
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Re: Lets Talk heat range of spark plugs

Post  kim on September 8th 2015, 3:45 pm

Heat range looks good.  Fuel line ok, maybe a little rich.  I see a few specs, might want to drop timming a degree or two.  Few oxide of n20 fecs.

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Re: Lets Talk heat range of spark plugs

Post  t-bird racer on September 9th 2015, 9:21 am

Timing is at 31 or 32 degrees. Thanks for your response.
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