reading a alcohol plug

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reading a alcohol plug

Post  muddog899 on September 17th 2014, 9:38 am

Long time no post but I could use some help reading this plug the motor is a 552 14/1 compression running alcohol. Timing is set at 36 degrees locked out running a crank trigger, carb is a 4500 Holley jetted 210 on all four corners. It looks like the fuel is right because the cadmium is burnt off to the first thread but I can’t tell on the timing I don’t see any marking on the electrode.
I have a 8 passes on the plugs running sand drags so only 300 feet at a time and help or advice would be great thanks for your time guys.



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Re: reading a alcohol plug

Post  cool40 on September 17th 2014, 9:45 am

The strap looks colored down to the base.put a new plug in and back the timing up at least 2*.my experience has been less is better in some efficient head packages. My 526 with A heads have 70cc with very small dome and ran faster @28*.
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Re: reading a alcohol plug

Post  muddog899 on September 17th 2014, 9:54 am

forgot to add the heads are trick flow streets nothing done to them

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Re: reading a alcohol plug

Post  the Coug on September 17th 2014, 10:30 am

whats your elevation? it also has a lot to do with Timing I hear everyone say 28* which is BS I have run 28* and keep upping it and have found in higher elevations it takes more I have ran up to 38* to 40* but my elevation is 3975 but the corrected it sometimes up to 9000 depending on heat and humidity and where the jet stream is and what it is doing.... So my suggestion is play with the timing make a run and advance it a couple degrees if it picks up bring it up some more if it slows down lower your timing.... Timing is not a set in stone deal every combination wants its own it is up to you to find what it likes...
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Re: reading a alcohol plug

Post  muddog899 on September 17th 2014, 10:54 am

my elevation is 3800 ft here all try messing with the timing 2 degrees at at time the only issue that i see doing that is the phasing of the dist since i run a crank trigger, thanks guys all good info

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Re: reading a alcohol plug

Post  richter69 on September 17th 2014, 12:25 pm

looks like a fairly cold plug, imo an NGK is easier to read also.

watch the mph also w the timing changes and use that as another tunning aid. (whoops saw its a not a drag car lol)

fwiw I ran around 36 total w my tfs heads and methanol, 1200' elevation, avaeage around 2800 corrected
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Re: reading a alcohol plug

Post  muddog899 on September 17th 2014, 1:30 pm

the plugs are autolite 3933 if i was to change plugs any recomendtions, my buddy also said NGK are easier to read

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Re: reading a alcohol plug

Post  cool40 on September 17th 2014, 2:43 pm

the Coug wrote:whats your elevation?  it also has a lot to do with Timing I hear everyone say 28* which is BS I have run 28* and keep upping it  and have found in higher elevations it takes more I have ran up to 38* to 40* but my elevation is 3975 but the corrected it sometimes up to 9000 depending on heat and humidity and where the jet stream is and what it is doing.... So my suggestion is play with the timing make a run and advance it a couple degrees if it picks up  bring it up some more if it slows down lower your timing.... Timing is not a set in stone deal every combination wants its own it is up to you to find what it likes...
you're right timing is not set in stone but 28* sure aint BS from me.I did it more than one time at the track but maybe et's dont count. Rolling Eyes
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Re: reading a alcohol plug

Post  the Coug on September 17th 2014, 2:54 pm

cool40 wrote:
the Coug wrote:whats your elevation?  it also has a lot to do with Timing I hear everyone say 28* which is BS I have run 28* and keep upping it  and have found in higher elevations it takes more I have ran up to 38* to 40* but my elevation is 3975 but the corrected it sometimes up to 9000 depending on heat and humidity and where the jet stream is and what it is doing.... So my suggestion is play with the timing make a run and advance it a couple degrees if it picks up  bring it up some more if it slows down lower your timing.... Timing is not a set in stone deal every combination wants its own it is up to you to find what it likes...
you're right timing is not set in stone but 28* sure aint BS from me.I did it more than one time at the track but maybe et's dont count. Rolling Eyes


Lee I in no way ment you were BS it was a total analogies where everyone thinks that is a magic number
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Re: reading a alcohol plug

Post  maverick on September 17th 2014, 8:48 pm

muddog899 wrote:my elevation is 3800 ft here all try messing with the timing 2 degrees at at time the only issue that i see doing that is the phasing of the dist since i run a crank trigger, thanks guys all good info

If you're making your timing changes at the trigger, I don't see a phase issue. Are you changing timing with retard chips in an MSD or the like?
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Re: reading a alcohol plug

Post  Lem Evans on September 17th 2014, 8:52 pm

Just back the timing back to 33-34* and read your et slip. Please do not make this harder than it should be.

The AR-3934 may be more where you need to be.

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Re: reading a alcohol plug

Post  muddog899 on September 18th 2014, 9:10 am

thanks guys all try the changes and see how it does Very Happy

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