Spark Plug Upgrade - Chevelle Tech
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post #1 of 29 (permalink) Old Oct 9th, 19, 8:34 AM Thread Starter
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Mike
 
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Spark Plug Upgrade

Looking for a plug and gap recommendation. I'm just running the $1.50 AC Delco R44 XLS in my 454 with 390 heads off a 67 vette. Is there something better out there to try while I'm at it? Ignition wise, I'm just running the msd pro billet and blaster coil and doing timing control through the Fitech.

67 Chevelle 454, M21
Gen IV 454 (out of C30 ), 390 heads 1.88/2.19 valves by Vortecpro, with ISKY Hyd Roller cam (at 050 218 int./228 exh, lift 530 int./552 exh.), RPM performer intake, Fitech 600HP, Dougs headers, and M21, Gear Vendors OD, 3.73's, UMI Suspension, Viking coilovers.
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post #2 of 29 (permalink) Old Oct 9th, 19, 9:09 AM
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Harry
 
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Re: Spark Plug Upgrade

No Recommendations, but...,

I have a big cam, 9.6 to 1 compression, and I have aluminum Edelbrock heads and went from a Champion RC12YC to a hotter RC14YC (40 gap) and put in a hotter thermostat - I can't remember if it was a 180 or 195. With my MSD digital 6 plus and the HEI coil, this allowed me to clean up my idle more. A better burn at idle, I could lean it out more, close the throttle blades a little more and get rid of any smell. The idea is to get the aluminum heads at the optimum temperature for burning fuel at idle. Also, running a vacuum advance at idle helps a lot for drivability with a big cam.

Note: I have a huge griffin radiator that never gets hotter than the thermostat even with the air conditioning on.

Note2: If you have iron heads with big compression, this may not work for you, going to a hotter plug and hotter thermostat can easily give you pre- detonation, so, you have to be careful...
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post #3 of 29 (permalink) Old Oct 9th, 19, 9:33 AM
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Re: Spark Plug Upgrade

Quote:
Originally Posted by mdelgado View Post
Looking for a plug and gap recommendation. I'm just running the $1.50 AC Delco R44 XLS in my 454 with 390 heads off a 67 vette. Is there something better out there to try while I'm at it? Ignition wise, I'm just running the msd pro billet and blaster coil and doing timing control through the Fitech.
My 11 second certified stock appearing SS454 LS6 runs those $1.50 AC Delco plugs too.
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post #4 of 29 (permalink) Old Oct 9th, 19, 9:41 AM
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Jon N.
 
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Re: Spark Plug Upgrade

For everyday use those buck fifty plugs are fine. For extremely modified engines, it would be a different story.

As long as they light the fire, you're good.
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post #5 of 29 (permalink) Old Oct 9th, 19, 10:06 AM
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Re: Spark Plug Upgrade

Quote:
Originally Posted by mdelgado View Post
Looking for a plug and gap recommendation. I'm just running the $1.50 AC Delco R44 XLS in my 454 with 390 heads off a 67 vette. Is there something better out there to try while I'm at it? Ignition wise, I'm just running the msd pro billet and blaster coil and doing timing control through the Fitech.
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post #6 of 29 (permalink) Old Oct 9th, 19, 10:26 AM
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Tom
 
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Re: Spark Plug Upgrade

I don't think there's a nickel's worth of difference between spark plugs, personally. I've always used NGK V-powers, they're under $2. UR6s in my 496. Nothing wrong with AC or Autolite. Old timers will tell you Champions belong in lawn mowers.
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post #7 of 29 (permalink) Old Oct 9th, 19, 10:27 AM
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Re: Spark Plug Upgrade

Mike, while I'm sure the Chinese $1.50 plugs are fine, I prefer a non-Chinese Jap plug for my Chevelle. Believe it would be an NGK GR5 or BPR5ES ( race maybe?) I gap .045 for MSD, and .037 w/o.
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post #8 of 29 (permalink) Old Oct 9th, 19, 10:28 AM
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Re: Spark Plug Upgrade

Quote:
Originally Posted by ZEN357 View Post
Sorry, those are overpriced gimmick plugs.

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post #9 of 29 (permalink) Old Oct 9th, 19, 11:28 AM
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Tom
 
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Re: Spark Plug Upgrade

Quote:
Originally Posted by Rich-L79 View Post
Sorry, those are overpriced gimmick plugs.
Agreed.

The only time I feel it's beneficial to use a fancy plug is if it is specified by the OEM or it's very difficult to change. Ever change plugs on a 4th gen Camaro? A longer lasting iridium plug would extend services but not increase performance.

I have extensive experience with motorcycles and any advantage you can get is worth it's weight in gold. If a plug change gives you ten HP in our cars you may not feel it on the street. If that same plug gave you one HP on a bike you WILL feel it (speaking single cylinder 60 HP). So positive changes are far more pronounced the smaller the scale and it's way cheaper to experiment with single cylinders. I've tried most of the "high zoot" plugs over the years and found exactly zero gains. Good news is I'm only out maybe $15 when I go back to my NGK V-Power. But the shame of being suckered again does sting a bit.

The owner of an independent shop I worked for years ago was a driveability wiz. He showed us on an oscilloscope the difference between brands of plugs. His opinion, which was proven on the scope, was that NGK plugs had the cleanest and most consistent spark pattern. Not that the others were "bad", they just weren't quite as consistent. He could tell what plugs were in a car just by looking at the scope. Absolute wizard.

That's the long way to say that any name brand plug is as good as another but my preference is NGK. Because science, not hyperbole.
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70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #10 of 29 (permalink) Old Oct 9th, 19, 12:28 PM
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Re: Help with new crate engine overheating

And that was back when ACDelco and Autolite weren't made in the same factory in Guangdong. Heck, as far as I know, the NGK's may be made there as well nowadays.
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post #11 of 29 (permalink) Old Oct 9th, 19, 12:30 PM Thread Starter
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Mike
 
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Re: Spark Plug Upgrade

Thanks for the insight. I've only run AcDelco and NGK's so far. I guess we'll stick with what works and stay away from the laser platinum triple Iridium quadruple electrode plugs .
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67 Chevelle 454, M21
Gen IV 454 (out of C30 ), 390 heads 1.88/2.19 valves by Vortecpro, with ISKY Hyd Roller cam (at 050 218 int./228 exh, lift 530 int./552 exh.), RPM performer intake, Fitech 600HP, Dougs headers, and M21, Gear Vendors OD, 3.73's, UMI Suspension, Viking coilovers.
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post #12 of 29 (permalink) Old Oct 9th, 19, 12:43 PM
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Re: Spark Plug Upgrade

E3's shroud the firing end of the plug, junk.

As far as spark plug gap, THE MAXIMUM, NO MATTER THE PLUG, NO MATTER THE IGNITION SYSTEM, NO MATTER ANYTHING ELSE, NO MATTER THE PLANET THE CAR IS BEING DRIVEN ON......045 MAXIMUM.

My self, I prefer NGK and Auto-Lite.


Engine temperatures, cast iron block, cast iron heads, 180 deg/F., cast iron block, aluminum heads, 195 deg/F. Reason: aluminum dissipates heat a lot faster than cast iron does, so, a slightly higher temperature helps retain correct combustion chamber temps. A plug temp will only help burn temperatures if they are either too hot, or, cold, and is mostly set by the compression ratio, and the heat dissipation ability of the combustion chamber.
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post #13 of 29 (permalink) Old Oct 9th, 19, 1:42 PM Thread Starter
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Mike
 
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Re: Spark Plug Upgrade

Quote:
Originally Posted by Dave Ray View Post
E3's shroud the firing end of the plug, junk.

As far as spark plug gap, THE MAXIMUM, NO MATTER THE PLUG, NO MATTER THE IGNITION SYSTEM, NO MATTER ANYTHING ELSE, NO MATTER THE PLANET THE CAR IS BEING DRIVEN ON......045 MAXIMUM.

My self, I prefer NGK and Auto-Lite.


Engine temperatures, cast iron block, cast iron heads, 180 deg/F., cast iron block, aluminum heads, 195 deg/F. Reason: aluminum dissipates heat a lot faster than cast iron does, so, a slightly higher temperature helps retain correct combustion chamber temps. A plug temp will only help burn temperatures if they are either too hot, or, cold, and is mostly set by the compression ratio, and the heat dissipation ability of the combustion chamber.
I'm running cast iron heads, and the 390's Vortec pro's estimation put me around 9.8:1. I am running a 160 degree t-stat, so that may be too cold. Any heat range recommendation?

67 Chevelle 454, M21
Gen IV 454 (out of C30 ), 390 heads 1.88/2.19 valves by Vortecpro, with ISKY Hyd Roller cam (at 050 218 int./228 exh, lift 530 int./552 exh.), RPM performer intake, Fitech 600HP, Dougs headers, and M21, Gear Vendors OD, 3.73's, UMI Suspension, Viking coilovers.
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post #14 of 29 (permalink) Old Oct 9th, 19, 2:24 PM
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Jon N.
 
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Re: Spark Plug Upgrade

Why do you want something other than the 44's you are using?
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The only reason someone would want insurance is if they want to pay someone elses bills or want someone else to pay their bills.

BIGOT is a word used by people that can't use logical reasoning to prove that you are wrong when you don't agree with them.
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post #15 of 29 (permalink) Old Oct 9th, 19, 3:49 PM Thread Starter
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Mike
 
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Re: Spark Plug Upgrade

Quote:
Originally Posted by dyno jonn View Post
Why do you want something other than the 44's you are using?
Just time to swap mine out and figured you guys would know what's best, so I'd ask you first.
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67 Chevelle 454, M21
Gen IV 454 (out of C30 ), 390 heads 1.88/2.19 valves by Vortecpro, with ISKY Hyd Roller cam (at 050 218 int./228 exh, lift 530 int./552 exh.), RPM performer intake, Fitech 600HP, Dougs headers, and M21, Gear Vendors OD, 3.73's, UMI Suspension, Viking coilovers.
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