Re: Plugs for 512
[Re: 1974PW]
#727034
06/17/10 09:28 PM
06/17/10 09:28 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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Best plug on the market Autolite racing AR 3933 for yours which is a cooler range plug...Up to about 12:1 I would use a AR 3934 which is a med heat plug... You cant hardly foul them out, and they last several seasons... Note they are a cut back style ground strap  And they are available at the local parts store like Advance etc
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Plugs for 512
[Re: Bob_Coomer]
#727035
06/17/10 10:31 PM
06/17/10 10:31 PM
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Joined: Sep 2007
Posts: 876
Arizona
PolyDart
OP
super stock
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OP
super stock
Joined: Sep 2007
Posts: 876
Arizona
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Quote:
Best plug on the market
Autolite racing
Can't do it. Guess I'll stick with NGK. I looked up the plug and it's "Fram Autolite". I don't want anything related to Fram anywhere close to any of my engines.
I built this page describing my experience with Fram and their insurance company.... Never again...
http://framsucksmorethanair.com/
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Re: Plugs for 512
[Re: Cab_Burge]
#727038
06/18/10 08:32 AM
06/18/10 08:32 AM
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Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
MRMOPAR622
top fuel
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top fuel
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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I think the Champion C59CX is about the same as the AR3933. It seems to work good in my engine.
I do know the plugs seem to make a lot of difference in the Big Block Mopar engines.
Bob do you think the AR3933 would be better than the C59CX in my 15-1 engine with twin Terminators on alcohol?
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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Re: Plugs for 512
[Re: MRMOPAR622]
#727040
06/18/10 12:39 PM
06/18/10 12:39 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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Quote:
I think the Champion C59CX is about the same as the AR3933. It seems to work good in my engine.
I do know the plugs seem to make a lot of difference in the Big Block Mopar engines.
Bob do you think the AR3933 would be better than the C59CX in my 15-1 engine with twin Terminators on alcohol?
Thats about the same setup I ran, nut it was twin Terminators. I ran a single small 4" toilet. The engine was about 15.5:1.
Comparing spark plugs to oil filters, and Im being called crazy. 
Yea..OK there...
If people are fouling these things out, they do need some tune up lessons fact...
I ran a set for 3 seasons, had the heads off for some work, and went ahead and purchased new ones.
I cant say I have been through set after set, cause I havent......So maybe I have just lucked out and got special plugs or something.
I have run NGK's once, never had no trouble really..
I have run them in street engines 600+hp, alky injected engines with 900hp, and average bracket engines in the 700-800hp range. So my experience is first hand not based one single application, or some internet story, about something totally diff.
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Plugs for 512
[Re: Bob_Coomer]
#727041
06/18/10 02:52 PM
06/18/10 02:52 PM
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Joined: Jan 2003
Posts: 21,088
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,088
Niles , Ohio
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I run the NGKs in my Stealth headed 446 with 12.5 domes.I had Autolites and they did OK.The NGKs seem to idle better and have more response.I used NGK R5671A-8.Stock # 4554.They have been in for 4 months and its street driven.That and my kids price at Advanced was like 13 bucks for 8.Rocky
Chrysler Firepower
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Re: Plugs for 512
[Re: PolyDart]
#727042
06/18/10 03:10 PM
06/18/10 03:10 PM
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Joined: Jan 2003
Posts: 16,934
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,934
NC
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Quote:
It's getting close to start up time for my 512 low deck. Heads are Stealths, compression is 13.5:1.
For comparison in my 511 low deck with Indy heads at 13.5 (flat top piston), I run NGK R5672A-8.
I did run the standard tip, cooler, Autolite AR3933 for a few months (60 passes) and they were OK but a little cold for my application. I then put the equivalent NGK R5671A-9 in they were the same. So I went back to the R5672A-8. This is my second year on the -8 plugs. I ran the same projected tip -8 plugs in my engine on gas too. Always got a couple years on them (300 passes) and replaced them while they were still working fine. Now Ron's Toilet injected with E85.
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Re: Plugs for 512
[Re: tboomer]
#727044
06/18/10 03:53 PM
06/18/10 03:53 PM
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Joined: Sep 2007
Posts: 876
Arizona
PolyDart
OP
super stock
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OP
super stock
Joined: Sep 2007
Posts: 876
Arizona
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Quote:
Comparing spark plugs to oil filters, and Im being called crazy.
I agree, but that's not what I'm doing. I am considering the support system Fram DOESN'T HAVE. From my experience they could care less about the end user. As long as Checker and Autozone continue to stock their shelves with practically nothing, but Fram junk filters, they're happy as pigs in slop.
Let's say you bought an SRT8 and your air filter completely failed letting crap run through your engine for a few thousand miles. What would you expect the filter manufacturer to do for you? I didn't even get a replacement filter after I sent mine in for "inspection". Not even a damn filter
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Re: Plugs for 512
[Re: 440Jim]
#727046
06/18/10 06:50 PM
06/18/10 06:50 PM
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Joined: Jan 2004
Posts: 3,839
Central Missouri Fort Leonard...
mopar65
master
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master
Joined: Jan 2004
Posts: 3,839
Central Missouri Fort Leonard...
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Jim what is the difference between the R5671A-8 and R5672A-8. which NGK plug would you recommend for my 11.1 Indy EZ headed 440 engine with wisco flat top pistons? Rick i think you would want the non resistor plug for the msd. Mopar65
3520 pound race ready 1973 Street/Strip Dodge Dart - Stock stroke 440/727
10.49 @ 125.0 on 93 pump gas & ET Street Radials. More to come...
( SGT Miller) Proudly served 12 years in the US ARMY RESERVES
support our troops
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Re: Plugs for 512
[Re: PolyDart]
#727047
06/18/10 07:04 PM
06/18/10 07:04 PM
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Joined: Dec 2008
Posts: 1,200
UK
602heavy
pro stock
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pro stock
Joined: Dec 2008
Posts: 1,200
UK
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Quote:
What kind of real world difference does the projected vs non-projected tip make?
Projected type plug is basicly self cleaning & will run hotter due to the projected porcelane & longer ground strap , if the motor is bordering detonation , ie: speckles showing on porcelane &/or ground strap heat mark past bend towards threads then a non projected type may fair better (equivalant heat range)
Projected plugs run hotter due to being further into the combustion chamber.
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I'm not sure if the stealths reqire a 5/8 socket plug or a if you can use the standard long reack 13/16 socket plugds like the Champion N6YC or colder plugs 
but NGK`s last and run better for me personally. And to say ANYTHING is the best is just plain crazy. 
