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Discussion Starter · #1 ·
NGK BKR5 EIX

Anyone ever use this in a big block before with Eddy Alum heads? I have been running Autolites 3926 / Ar3924 .

NGK posts this to be a little cooler plug comparable to the AR3924

Looking for something a little more sparky

Thanks
SK
 

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SK- while I can't comment directly on your question of BB compatability, etc., I CAN tell you that the NGK Iridiums were the only plugs I could run in my supercharged dragbike. They out performed and out lasted everything I had tried, just were alittle pricey, but worth it IMHO.
 

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Boldly procrastrinating
66 El Camino 57 Chevy pickup 2004 Tahoe
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Please refrain from posting the same topic in different sections. Your other one has no replies, will be deleted.

Incidentally, my experience is the opposite of Davids. I only use Pts in EFI engines that have never burned a drop of oil. Otherwise, foul city.
 

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You actually want the hottest, not the coldest, spark plug that the engine will run with without causing pre-ignition. Plugs that are too cold will not burn off deposits at lower rpms & misfire because of this at higher rpms.

Plat & Irid plugs. There are a couple of benefits. There is a phenomenon in electrical theory called quench [ not related to combustion chamber quench ]; when a spark is generated, the surrounding metal, which is cooler, tries to quench or extinguish the spark. By reducing the metal volume, there is less chance of the spark being extinguished & so misfires are reduced. Hence, the use of fine wire Plat & Irid electrodes. These very hard metals are reqd to reduce plug tip erosion & give long plug life. An extra benefit is that less arc over voltage is reqd, so the plugs will still fire as they get old & plug gap increases.
For performance use, the benefit is being able to use a bigger plug gap for the same voltage.
 

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Discussion Starter · #5 ·
Okay thanks, I ordered a set to try out. The El Camino 427 was a little lean and wanted to try something one stage colder.

SK
 

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Okay thanks, I ordered a set to try out. The El Camino 427 was a little lean and wanted to try something one stage colder.

SK
If it's lean, doesn't it possibly need more fuel?
 

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I would not use a Spark Plug that costs $ 6.99us to $ 9.99us each
NGK Spark Plugs BKR5EIX-11: Iridium IX Spark Plug 14mm x 3/4" Reach | JEGS

as that would be $ 60.00us to $ 100.00us every time I wanted to change them
to help with a Lean problem that could be fixed much cheaper by adjusting the Fuel/Air Mixture

Here is what I use in my car's HEADS - Edelbrock Perf RPM Alum # 6045 / 60455 Edelbrock 60455: Performer RPM 454-O Oval Port Aluminum Cylinder Head | JEGS
Champion RC12Y: Champion Spark Plugs 49776: RC12YC Race Plug 1/pkg | JEGS $ 1.99us
 

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Boldly procrastrinating
66 El Camino 57 Chevy pickup 2004 Tahoe
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fiddling with the spark plugs will never change the F/A ratio. if it's lean it's lean, that a carburetor fix thing.
 
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$7-$10 for an NGK Iridium plug? You guys in the USA don't know how lucky you are. They are $32 each here. When I try & buy NGKs from Summit, NGK has an agreement with Summit not to sell out to outside the USA. So that ensures that NGK can rip us off in Australia. Did I hear the word 'free trade'....

Autolite's are cheaper, only $15 ea....

5 L [ 1.3 US gal ] of syn engine oil, $75-80 here.
 

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Speaking only to my experience, I used NGK Iridium plugs in my supercharged SBC @ 10lbs boost and the engine never missed a beat while the engine lasted. Excellent quality plugs.
 
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