What spark plugs for alcohol??
#957987
03/24/11 08:57 PM
03/24/11 08:57 PM
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Joined: Dec 2007
Posts: 345
Ontario, Canada
Hyper Henry
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enthusiast
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OP
enthusiast
Joined: Dec 2007
Posts: 345
Ontario, Canada
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Not trying to start a great debate about what spark plugs are best but would like help in deciding what plug to run with my combo  Is there a plug that works best for running alcohol  512 RB, 14.5, Eddy heads by MCH, solid roller .693/.660 274/280, mechaincal stack injection on alcohol.  Derrick
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Re: What spark plugs for alcohol??
[Re: Hyper Henry]
#957988
03/24/11 09:13 PM
03/24/11 09:13 PM
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Joined: Jan 2003
Posts: 9,996
Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Frostbitefalls MN (Rocky&Bullw...
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I tune with a -9 NGK, am going to switch to an Autolite 3911. More than one knowledgeable person on this board say they are worth a few hp. I run alky, 15/1 compression 528 with 440-1 heads.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: What spark plugs for alcohol??
[Re: gregsdart]
#957989
03/24/11 10:28 PM
03/24/11 10:28 PM
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Joined: Jan 2003
Posts: 6,314
The Swamp
MegaDart
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The Swamp
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Quote:
I tune with a -9 NGK, am going to switch to an Autolite 3911. More than one knowledgeable person on this board say they are worth a few hp. I run alky, 15/1 compression 528 with 440-1 heads.
Greg, isn't the 3911 a projected tip?? I thought that was a no no with injection.
Projected tip are worth a few ponies, but not supposed to be used with NOS or injection. 
FWIW, I have been running AR3932 for many years with great results. 14:1 555ci, also ran them in my big motor on gas/nos. I like the cutback electrode.
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Re: What spark plugs for alcohol??
[Re: MegaDart]
#957990
03/25/11 09:52 AM
03/25/11 09:52 AM
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Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
MRMOPAR622
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Posts: 2,008
Sweet Home Alabama
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I have been running the Champion C59CX was told a week or so ago the Autolite AR3910 was the same. I plan on trying some,I think they are a side gap plug. I run 2 Terminators on alcohol 15.2-1 CR and the Champions seem to work good,but they said on the dyno the Autolites where worth a few more HP.
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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Re: What spark plugs for alcohol??
[Re: gregsdart]
#957993
03/25/11 03:08 PM
03/25/11 03:08 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
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Rock Springs
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I ran AR 3933 in my engine... 15.5:1 compression with Rons alky Injection.
[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: What spark plugs for alcohol??
[Re: Garceau]
#957995
03/25/11 05:09 PM
03/25/11 05:09 PM
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Joined: Feb 2004
Posts: 2,073
Tulsa, Ok
WadeMetzinger
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Joined: Feb 2004
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Tulsa, Ok
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I run AR-3911s in both of my alky motors (Small and big block)
Wade Metzinger 918-809-0987 71 Cuda 9.28@145 -1s, Pglide 68 Cuda 10.64@124 1.45 60's 318->390 eddys Moparts discount code on WIX - moparts www.Filter1.com
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Re: What spark plugs for alcohol??
[Re: WadeMetzinger]
#957996
03/25/11 08:04 PM
03/25/11 08:04 PM
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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
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Sweet Home Alabama
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Greg, They tell me the AR3910 plugs are side gapped like C59CX plugs. Going to stop by Advance and order a couple of sets tomorrow to try.
The AR3910 are $2.69 ea @ Advance.
PS While we have some people on here with some knowledge on alcohol I wound like to ask a question. Do you retard or advance timing with alcohol? Some say advance some say retard. So far I have left mine @ 35 degrees,thats what it was when it was dynoed on race gas. Just getting to the point where everything is working good enough to try a few things.
Last edited by MRMOPAR570; 03/25/11 08:14 PM.
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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Re: What spark plugs for alcohol??
[Re: MRMOPAR622]
#957997
03/25/11 10:12 PM
03/25/11 10:12 PM
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Joined: Jan 2003
Posts: 6,314
The Swamp
MegaDart
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The Swamp
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Quote:
PS While we have some people on here with some knowledge on alcohol I wound like to ask a question. Do you retard or advance timing with alcohol? Some say advance some say retard. So far I have left mine @ 35 degrees,thats what it was when it was dynoed on race gas. Just getting to the point where everything is working good enough to try a few things.
You do what the engine tells you to do. No two are the same. Typically smaller motors respond better to more timing then big motors. I retarded my 604ci on alky but my 555ci likes lots of timing. YOu just have to experiment
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Probally the same reasoning on using the true side gap plugs on boosted or nitro injected motors 
