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Spark Plugs 101


Oscar_the_Grouch
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Hello all and welcome to Spark plugs 101

 

Here will be some info I have gathered over the years on some Spark plugs I have used and personally tested. Have provided some part numbers and pics so you can relate. ANY imput you may have to ADD to this post please by all means POST !

 

Lets Start...

See chart bellow:

- If you are running a STOCK car then the OEm plugs will be FINE.

- If you have some MINOR mods done to the car (+30-40HP) then go 1 range colder on OEM plugs

- If you have mods done to the car (+40-70HP) then go 2 range colder on OEM plugs

 

OEM OPTIONS....(See chart bellow)

- Use the Eclipse plugs with DUAL Ground Electrodes to increase the spark, to multiple due to multiple electrodes and at the same time get a BETTER spark as the center electrode is EXPOSED to the Air/Fuel Mix thus a better combustion. And also this will serve as an Anti-Fowling system over the OEM single ground electrode.

 

RACE App.

- You can use the RX7's Spark plugs for wildly modified cars to better attomize the air/fuel mix as they have 4 ground electrodes with an exposed center electrode. These plugs were designed for the rotary engine because a rotary motor are VERY turbulent in the combustion chanbers thus they needed a spark plug with GOOD firing capabilities. The multi pronged sparkplugs help make sure you get a SPARK or a multiple spark under the worst possible conditions.

 

- You will need to experiment with your ride to see which one will benefit you the most. From PERSONAL experiences....I have used them all and I like the BR8EQ-14's. These will give you a little bit of hessitation when cold but for about 3-7 minutes then its HOLD ON BABY! If you like more of the INSTANT power then go for the BR7EQ-14's these will be great on EXTREME cold days BUT these are NOT recomended for road race as they get REALLY hot and can fail on you.

 

And finally the 2nd Gen RX7 Plugs are the latest and are good but I still preffer the 1st gens for teir "MUSHROOM" spark kernel effect. the 2nd Gen's are more of a sideways and upward kernel.

 

Again these are personal tests and testimonials so its up to you to test these on your car as we all have different upgrades and modifications and very seldon two cars are the same.

 

I hope some of this information helps some of you as I was pretty ignorant to the specifics of HEAT RANGE and KERNEL size and its effect on combustion gases.

 

Enjoy !

Oscar

 

Plug Comparison

http://www.fr33z3.net/starions/Apr06/plugcompsheet_copy1.jpg

 

heat Range explained

http://www.fr33z3.net/starions/Apr06/ngkheatragecode_copy1.gif

 

NGK Letter number guide

http://www.fr33z3.net/starions/Apr06/plugnumberkey.jpg

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I dunno if its just me, but I have had many of the BPR series plugs melt on me. No other damage has been done, just the tip melts off the plug after a hard day at the track. I personally quit running the resistor plugs in Turbo'd vehicles. I havent had the problem with the BP7es plugs. I'm gonna poke around and see If I like any other ones in the next couple weeks.
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I dunno if its just me, but I have had many of the BPR series plugs melt on me. No other damage has been done, just the tip melts off the plug after a hard day at the track. I personally quit running the resistor plugs in Turbo'd vehicles. I havent had the problem with the BP7es plugs. I'm gonna poke around and see If I like any other ones in the next couple weeks.

 

 

Never really hear problems like that with NGK??

 

Are you running maybe too hot of a plug and a side effect??

 

I run BPR8ES .035 gap with an MSD6A on the 4G54 and BPR6ES .028 on the 4G63.

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I havent ran them in the quest yet, but in 3 of my DSMs I ran BPR7ES @ .30 on 20psi and had a slight melting problem. My brother and my friend Adam had the same problems. I havent melted a non-resistor plug yet though.
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