spark plugs heat range

spark plugs heat range

Joined: December 14th, 2011, 2:03 pm

February 18th, 2012, 3:59 pm #1

i am using a ngk ur4 plug and heat range is one hotter than stock
what are you guys using and why?
be big be a builder
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Joined: May 20th, 2005, 4:48 pm

February 18th, 2012, 5:29 pm #2

How many threads are showing a discoloration from heat? There's lots of information that can be gained from reading spark plugs...

Brent Lykins
B2 Motorsports, LLC






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Joined: January 10th, 2002, 5:53 pm

February 19th, 2012, 4:49 pm #3

i am using a ngk ur4 plug and heat range is one hotter than stock
what are you guys using and why?
I jet for MPH on the track and lean the primarys as much as I can stand on a street car. If it's a street runner, stock or one hot helps keep them clean. For the strip, one step cold usually.

For a stocker, street performance 351C I use Autolite 25s. In the engines I hammer on, reading the plugs says we're good with #24s. I watch the last thread for and idea about mix quality and the ground electrode along with the insulator for what's going on in there. Look for "pepper" on the center insulator as an indicator of detonation.

I use Autolites, buy them cheap at Walmark. I don't really believe much in platinum-krypton fancy plugs. Autolites get the job done for a reasonable price.

1967 Falcon 4 door 351C-4V
1970 Mustang 351C-2V
http://raceabilene.com/kelly/hotrod
Owner built, owner abused.
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Joined: December 21st, 2003, 1:43 pm

February 19th, 2012, 9:50 pm #4

Yep. Autolite 24 in my race motor. You can spend a lot more money on fancy plugs and not be able to notice a measurable difference in performance.
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Joined: December 14th, 2011, 2:03 pm

February 22nd, 2012, 4:15 pm #5

i paid 2.19 a piece for the ngk
had luck with them in past
will keep in mind the autolite
with next change to see diff.
be big be a builder
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Joined: December 19th, 2008, 2:01 pm

February 22nd, 2012, 4:44 pm #6

Yep. Autolite 24 in my race motor. You can spend a lot more money on fancy plugs and not be able to notice a measurable difference in performance.
In my preparations/research to begin troubleshooting/tune my build, the guys at Evergreen Performance Systems told me they have sometimes seen detonation attributable to platinum plugs, anyone have any experience with this notion?

I am running AP25's currently but bought a couple of sets of 24's (on EPS's recommendation) to go forward with. I only put the AP25's in because I thought they were the "hot setup" nowadays (same reason I put on CalTracs over my old school extended (for Cougar) J-bolt Lakewood slapper bars!). 24's on sale at Advance with MIR on top of that were dirt cheap, so I picked some up.
Last edited by rentwist on February 22nd, 2012, 4:46 pm, edited 1 time in total.
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Joined: February 13th, 2006, 4:59 am

February 22nd, 2012, 11:53 pm #7

i am using a ngk ur4 plug and heat range is one hotter than stock
what are you guys using and why?
The ur4 is a good plug and relatively cheap to buy. I have used the ur 5 also which is the next coldest. I had better luck with that style plug than the platinum.
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Joined: October 23rd, 2001, 2:07 am

February 23rd, 2012, 2:44 am #8

i am using a ngk ur4 plug and heat range is one hotter than stock
what are you guys using and why?
I also use Autolite #24's in my old wore out Cleveland. I still have points in my Mallory distributor also. Never a missfire and I shift at 7500 and had to remove my 7800 rpm high side chip.

For my future stroker engine I have a MSD billet dist. and MSD 7AL3 but will probalby still use Autolites?

Brian
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Joined: May 20th, 2005, 4:48 pm

February 23rd, 2012, 9:51 am #9



Brent Lykins
B2 Motorsports, LLC






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