stupid question.can running lean ruin plugs? PIC added
#684186
04/30/10 01:44 AM
04/30/10 01:44 AM
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Joined: Apr 2003
Posts: 512 Sacramento, CA
Bdrainy
OP
mopar
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OP
mopar
Joined: Apr 2003
Posts: 512
Sacramento, CA
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my engine was running super lean for a while (plug tips white). the car would run fine on normal driving but would backfire out of the exhaust whenver I got on it.
I fixed the running lean issue (didnt change the plugs though) and it started running prefectly. I changed the coil at the same time also. I checked the plugs after a day of driving aroung and part of the plug was a nice brownish color and the rest of the plug was still white. I left them in since it was running so good.
Anyway, the car was running perfeclty for the last week or so then tonight it started surging a little bit while I was on the freeway and when I got on it it started popping out of the exhaust again.
I can find no vacuum leaks, the plugs wires are in good shape and in the correct locations...I am just hoping the plugs got jacked up when it was running super lean, cause I am sick of this issue!!! I am going to pick up some new plugs tomorrow.
here are the specs: 383 10 to 1 cr lunati 60302 cam edelbrock heads TTI 1 7/8 headers rpm performer intake 670 street avenger MSD ready to distributor Denso alternator swap stock coil on there now using champion RC12YC gapped at 35
THanks for any help or ideas. initial timing at 18 total at 38 in by 2500
Last edited by 68383; 04/30/10 02:15 AM.
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Re: stupid question.can running lean ruin plugs? PIC ad
[Re: Cudajon]
#684192
05/01/10 01:02 AM
05/01/10 01:02 AM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Quote:
The more you advance the timing the more it affects your fuel mixture" Okay, how do you get to that conclusion? The distributor doesn't mix fuel. The carburetor does that. Running the advance to the max will not increase fuel pressure, jet size or anything else to do with the carburetor. Too much or too little lead will affect what gets BURNED and what doesn't.
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Re: stupid question.can running lean ruin plugs? PIC ad
[Re: Cudajon]
#684193
05/01/10 01:04 AM
05/01/10 01:04 AM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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That white is just a leaner idle curcuit most likely, i'd fatten it up a bit or jet it up, the street avangers are on the lean side from the factory. And if you look closely at the ground strap, you'll see the blue heat mark, it should be right in the middle of the strap between the tip & base, Its closer too the base, that meens it has too much total timing, i'd lower it to 35*, most every BB i've built run the best at 35* & no more.
Last edited by joedust451; 05/01/10 01:24 AM.
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Re: stupid question.can running lean ruin plugs? PIC added
[Re: Bdrainy]
#684195
05/01/10 12:53 PM
05/01/10 12:53 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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I have not used the street avenger carb, but I do have a 670 truck avenger carb and the transition circuit was lean. I think the idle restrictions were 0.025" or smaller. I drilled them to 0.028" and it really helped fix the off-idle stumble, and I was also able to get more adjustment from the idle mixture screws. Before, I had the mixture screws about 3-turns out and the mixture screws has very little effect. After drilling the restriction, I was able to set the idle mixture screws at 1-1/2 turns. I think the colder plugs would make it easier to read the plugs. I have been using the NGK V-Power R5672A-8 spark plugs in my Brodix B1-B/S heads for years with no problems. I am also running them in the new engine with the Edelbrock Victor heads, but I have not looked at the plugs in that engine yet. I am not sure why replacing your plugs helps? If the plug gets too hot it can cause pre-ignition. I mean really, if you have to replace the spark plugs anyhow, why not try a colder heat range?
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