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Re: White Plugs Burning Lean??
[Re: weazel]
#1518194
10/16/13 02:23 AM
10/16/13 02:23 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Unleaded gas does run cleaner but that's been around for decades. I'd jet up a bit & see how it acts. Might be a vac leak, might be too much timing, might be Ok as is. Without a meter I'd jet up & see what that does to the driveability (easy to do & easily reversible) & if it runs better stay with em
live every 24 hour block of time like it's your last day on earth
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Re: White Plugs Burning Lean??
[Re: RapidRobert]
#1518195
10/16/13 03:40 AM
10/16/13 03:40 AM
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Joined: Jan 2003
Posts: 20,158
Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,158
Park Forest, IL
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Is there any carbon built up on the threads? Where is the burn mark on the ground strap? Insulator color is pretty much meaningless anymore.
How is it running?
"Everybody funny, now you funny too."
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Re: White Plugs Burning Lean??
[Re: slantzilla]
#1518196
10/16/13 04:01 AM
10/16/13 04:01 AM
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Joined: Jun 2006
Posts: 5,159
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,159
CT
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The Street Avengers seem to be jetted very lean. My 770 Street Avenger on a stock 440 left the plugs very white out of the box as well.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: White Plugs Burning Lean??
[Re: weazel]
#1518197
10/16/13 10:59 AM
10/16/13 10:59 AM
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Joined: Jan 2003
Posts: 11,996
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 11,996
Benton, IL.
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Jetting for WOT is the easiest. If you have a drag strip nearby, just go and jet to the best MPH.
Correct jetting for the cruise is more involved and will require a meter and some additional knowledge of the power circuit. And although this will cause some discussion, an inexpensive narrow band O2 will get you very close.
To be clear, I am recommending the narrow band for tuning only the cruise ratio right now.
Flame on..............
Master, again and still
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Re: White Plugs Burning Lean??
[Re: DaveRS23]
#1518198
10/16/13 01:17 PM
10/16/13 01:17 PM
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Joined: Sep 2010
Posts: 114
Oakdale, MN
weazel
OP
member
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OP
member
Joined: Sep 2010
Posts: 114
Oakdale, MN
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I will snap a picture of them tonight. The engine only had 300 miles on it and it dropped a cylinder so the engine shop rebuilt it again. Those plugs where white. The new plugs maybe have 75 miles on them. Still looking white.
This is a street car so it wont be doing much WOT, just cruising. One problem I have with it and why the jetting was suggested was first off the white plugs. Then there is the dead stop and hammering it. It bogs down big time until it seems to get into the main jets then takes off like a SOB. I also have my idle set at 800 and when put in gear it drops to about half that. I know the 268 cam has a somewhat loopy idle but I dont know if the jetting has anything to do with that.
If you guys think this is two different issues lets stick with the plugs first. I would like to make sure that is correct first.
Last edited by weazel; 10/16/13 01:19 PM.
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Re: White Plugs Burning Lean??
[Re: Cab_Burge]
#1518200
10/16/13 01:49 PM
10/16/13 01:49 PM
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Joined: Jun 2006
Posts: 5,159
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,159
CT
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What did it do when you say it "dropped a cylinder"
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: White Plugs Burning Lean??
[Re: Rug_Trucker]
#1518202
10/16/13 02:24 PM
10/16/13 02:24 PM
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Joined: Oct 2012
Posts: 1,106
Northeast
VincentVega
super stock
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super stock
Joined: Oct 2012
Posts: 1,106
Northeast
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sounds like a timing or advance problem (initial timing partly coming from advance, which drops when going into gear)
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
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Re: White Plugs Burning Lean??
[Re: weazel]
#1518204
10/16/13 09:25 PM
10/16/13 09:25 PM
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Joined: Sep 2010
Posts: 114
Oakdale, MN
weazel
OP
member
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OP
member
Joined: Sep 2010
Posts: 114
Oakdale, MN
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There were only 3 plugs that were brownish and looked normal like this one.
Also the plugs are NGK ZFR6F. Im running 87 octane pump gas.
Last edited by weazel; 10/16/13 09:26 PM.
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Re: White Plugs Burning Lean??
[Re: Rug_Trucker]
#1518206
10/16/13 09:37 PM
10/16/13 09:37 PM
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Joined: Sep 2010
Posts: 114
Oakdale, MN
weazel
OP
member
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OP
member
Joined: Sep 2010
Posts: 114
Oakdale, MN
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Quote:
Quote:
I also have my idle set at 800 and when put in gear it drops to about half that. I know the 268 cam has a somewhat loopy idle
No alarm bells going off here guys? 
Care to elaborate with some useful info or being sarcastic about something?
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Re: White Plugs Burning Lean??
[Re: VincentVega]
#1518207
10/16/13 09:41 PM
10/16/13 09:41 PM
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Joined: Sep 2010
Posts: 114
Oakdale, MN
weazel
OP
member
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OP
member
Joined: Sep 2010
Posts: 114
Oakdale, MN
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Quote:
sounds like a timing or advance problem (initial timing partly coming from advance, which drops when going into gear)
I am thinking I may have a distributor problem also, but not entirely sure. I may start another thread about that, but Im more curious as to what you think about my plugs. From what you can tell with the pictures I posted.
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Re: White Plugs Burning Lean??
[Re: weazel]
#1518208
10/16/13 10:03 PM
10/16/13 10:03 PM
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Joined: Aug 2003
Posts: 43,097
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,097
Bend,OR USA
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Quote:
Quote:
Quote:
I also have my idle set at 800 and when put in gear it drops to about half that. I know the 268 cam has a somewhat loopy idle
No alarm bells going off here guys?
Care to elaborate with some useful info or being sarcastic about something?
I think the remark was to illuminate the mechanical advance dropping back from say 10 degrees BTDC to say 4 degrees BTDC when put in gear, the less initial advance will make the motor drop more RPM when put in gear  One of the accepted standards on RPM drop on initial timing and the mechanical ignition curve as well as setting the carb. up to idle on the idle circuit only is to have only 200 RPM drop from nuetral to in gear with a automatic trans that has a standard non racing converter, IE idles at 800 RPM in nuetral and drops to 600 RPM in gear   The less initial advance you have at idle can lead to a bigger RPM drop if the total mechanical advance has to much in it IE if you have 13 degrees mechanical(26 total crankshaft degrees) advance in the distributor and you want to have 34 degees total advance you have to set the initial at 8 degrees BTDC, but if the distributor has 3 degrees mechanical advance in it at 800 RPM and drops 2 distributor degrees at 600 RPM you end up with 4 degrees initial in it at idle, most motors don't like to have 4 degrees advance at idle  They do like 12 to 16 BTDC though at a 600 RPM idle speed  Is that clear  Lots of ways to make are hotrod motors run better, but it requires working on and modifying some of the parts to make them better
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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