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For the sparkplug readers- check these out #1707004
12/05/14 03:32 PM 12/05/14 03:32 PM
Joined: Jul 2007
Posts: 1,682
Philadelphia
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radar Offline OP
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radar  Offline OP
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R

Joined: Jul 2007
Posts: 1,682
Philadelphia
What story do these plugs tell you? They are from two ten minute drives with a fresh motor- the cam was just broken in and I'm thinking the rings might not be seated yet. I do know that I forgot to get new gas and I was still burning up 7 month old gas that may or may not have had sta-bil put in it (oops!). Also the carb is not tuned but should be close-ish or maybe lean its from my last 408 and now sits on a victor 340 and ported edelbrocks instead of an air-gap and stock e heads.

My thinking is either misfires on the clean ones or rings not seated yet and oil fouling the darker plugs. The heat range looks right on the straps and the rings all seem to say rich. Fuel distribution? It's a victor 340 intake.

Here ya go:


And a closeup/straight on view of #2 & #4


And a detail of #5 & #3
Re: For the sparkplug readers- check these out [Re: radar] #1707005
12/05/14 03:40 PM 12/05/14 03:40 PM
Joined: Jul 2007
Posts: 1,682
Philadelphia
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radar Offline OP
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radar  Offline OP
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Joined: Jul 2007
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Philadelphia
By the way Im not looking for a lean/fat evaluation- I am more curious about how some plugs are way cleaner
Re: For the sparkplug readers- check these out [Re: radar] #1707006
12/05/14 03:54 PM 12/05/14 03:54 PM
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Posts: 19,317
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Thumperdart Offline
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State of confusion
Quote:

What story do these plugs tell you? They are from two ten minute drives with a fresh motor- the cam was just broken in and I'm thinking the rings might not be seated yet. I do know that I forgot to get new gas and I was still burning up 7 month old gas that may or may not have had sta-bil put in it (oops!). Also the carb is not tuned but should be close-ish or maybe lean its from my last 408 and now sits on a victor 340 and ported edelbrocks instead of an air-gap and stock e heads.

My thinking is either misfires on the clean ones or rings not seated yet and oil fouling the darker plugs. The heat range looks right on the straps and the rings all seem to say rich. Fuel distribution? It's a victor 340 intake.

Here ya go:


And a closeup/straight on view of #2 & #4


And a detail of #5 & #3




Cranking comp. test, tune carb,new plugs, fresh gas and try again..........

Last edited by Thumperdart; 12/05/14 04:00 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: For the sparkplug readers- check these out [Re: Thumperdart] #1707007
12/05/14 04:21 PM 12/05/14 04:21 PM
Joined: Jan 2011
Posts: 4,785
Utah and Alaska
astjp2 Offline
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Utah and Alaska
Normally aspirated engines just do that due to differences in wet air flow. EGT's can vary a lot across a carbureted motor, up to 100* or more on a few that I have worked on. Sequential EFI is one of the few ways that helps eliminate the difference because it balances out each cylinder based on how it is firing. Tim

1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!
Re: For the sparkplug readers- check these out [Re: astjp2] #1707008
12/05/14 04:33 PM 12/05/14 04:33 PM
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Thumperdart Offline
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That sounds cool and all but he has issues and the carbs I fix don`t look that way. #1, make sure it`s sealed up, properly tuned w/fresh gas...........I take nothing for granted anymore and check everything 2-3 times..........

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: For the sparkplug readers- check these out [Re: Thumperdart] #1707009
12/05/14 04:43 PM 12/05/14 04:43 PM
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North Alabama
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Monte_Smith Offline
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North Alabama
Trying to read plugs under a "cruise" situation is pretty much a waste of time. Distribution, reversion and all sorts of other things happen during cruise, making what the plugs "LOOK" like pretty meaningless. Only thing to be really concerned about is a "WET" plug. Then is it wet with fuel or oil. If wet with fuel, a potential ignition or carb issue. If wet with oil, ring seal or oil entering somewhere else. Wet with fuel goes away once the plug is exposed to atmosphere and gas evaporates. Oil doesn't go away..........is how you tell which is which

Monte
Re: For the sparkplug readers- check these out [Re: Monte_Smith] #1707010
12/05/14 04:56 PM 12/05/14 04:56 PM
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Thumperdart Offline
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I hear ya Monte and my point was on a new build before I start tuning I makes sure the motor`s fairly sound because as we all know, carbs get blamed when they have no influence at all on an unhappy motor. And w/the 2-circuit tunes, you CAN read the cruise on the plug........

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: For the sparkplug readers- check these out [Re: Thumperdart] #1707011
12/05/14 06:59 PM 12/05/14 06:59 PM
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North Alabama
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Monte_Smith Offline
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North Alabama
Okie dokie..............look at the above plugs and tell me which circuit needs work.........LOL!!!

Monte
Re: For the sparkplug readers- check these out [Re: Monte_Smith] #1707012
12/05/14 07:03 PM 12/05/14 07:03 PM
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Thumperdart Offline
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Can`t they`re too jacked but you can read idle cruise and wfo on a plug problem is you mostly work on full blown race cars which have different needs especially the nos guys idling around w/cold ass plugs.

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: For the sparkplug readers- check these out [Re: radar] #1707013
12/05/14 07:36 PM 12/05/14 07:36 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
Get rid of the old fuel and install a new set of plugs...
the old fuel CAN be down low enough(RVP, reed vapor pressure)
that only in the hotter cyls its firing... what your
looking at now is a waste of time
Re: For the sparkplug readers- check these out [Re: Monte_Smith] #1707014
12/05/14 07:37 PM 12/05/14 07:37 PM
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Quicktree Offline
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Quote:

Okie dokie..............look at the above plugs and tell me which circuit needs work.........LOL!!!

Monte

with Monte, you can't tell crap cruzing
Re: For the sparkplug readers- check these out [Re: Quicktree] #1707015
12/05/14 07:40 PM 12/05/14 07:40 PM
Joined: Jul 2004
Posts: 19,317
State of confusion
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Thumperdart Offline
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Thumperdart  Offline
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Joined: Jul 2004
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Quote:

Quote:

Okie dokie..............look at the above plugs and tell me which circuit needs work.........LOL!!!

Monte

with Monte, you can't tell crap cruzing




You`re probably right.............

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: For the sparkplug readers- check these out [Re: radar] #1707016
12/06/14 02:01 AM 12/06/14 02:01 AM
Joined: Oct 2003
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Az
Crizila Offline
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Crizila  Offline
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Quote:

By the way Im not looking for a lean/fat evaluation- I am more curious about how some plugs are way cleaner

Fuel distribution would be my first guess.

Fastest 300
Re: For the sparkplug readers- check these out [Re: radar] #1707017
12/06/14 11:27 PM 12/06/14 11:27 PM
Joined: Jan 2007
Posts: 3,695
nc
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emarine01 Offline
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nc
what Auto lite plug #, what ignition system? what wire set, last set I saw that looked like that had real bad ign wires shorting all over the top of the engine, run the engine at night and look for the spark show...

Re: For the sparkplug readers- check these out [Re: Crizila] #1707018
12/07/14 01:52 AM 12/07/14 01:52 AM
Joined: Oct 2003
Posts: 11,684
W. Kentucky
justinp61 Offline
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justinp61  Offline
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W. Kentucky
Quote:

Quote:

By the way Im not looking for a lean/fat evaluation- I am more curious about how some plugs are way cleaner

Fuel distribution would be my first guess.




Bingo! Fuel distribution, my Victor 340 does it at cruise.
Re: For the sparkplug readers- check these out [Re: justinp61] #1707019
12/07/14 02:51 AM 12/07/14 02:51 AM
Joined: Jul 2007
Posts: 1,682
Philadelphia
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radar Offline OP
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radar  Offline OP
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Thanks for the responses fellas.

I've been having trouble getting time to work on the car but before I try to tune on it any more I'm getting some fresh gas. New wires plugs and coil are already installed to rule out those being problems. I also detailed my pro billet distributor- those suckers sure like to oxidize! Im running an analog 6al brain- in my experience they either work or not so if it runs I'm not looking there for trouble.

The plugs were autolite 3924. I couldn't find champs the day I swapped them last. I've heard champs are junk but I never had one break apart and I've been running rc12yc and rn12yc plugs in my mopars and harleys for years. I also like ngk b8es in my harley but haven't had any for a while. The silver colored champs are easier to read for me.

I think a reasonable street tune shouldn't be far away. I just have to lean out the idle circuit enough to cruise clean and get wot where it doesn't knock or blow black smoke and the fine tuning can wait till my wideband is up and running again. The dreaded innovate Error 8 was not fixed with replacement bosch sensor so I have to check my grounds again before I set it on fire and get a different setup.

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