360 fouling plugs, with black soot out of pipe on start
#176763
12/27/08 11:28 PM
12/27/08 11:28 PM
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Joined: Nov 2005
Posts: 93 Anacortes, WA
russ71satellite
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Anacortes, WA
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My son has a mildly modded 360 in a Dart, and is running a Holley 670 with headers. Compression is stock. Engine has always fouled plugs, and on startup, a deposit of black soot gets on the garage floor. Car has been sitting alot in recent months, due to body work.
My ideas: 1. Go to a hotter plug (not sure what he has in there now, but they are for a stock 318. 2. Adjust carb for a leaner mixture. (Not sure where he has mixture now.)
Also, what is the consensus on ignition timing recs?
Ideas on these 3 points?
He is in Oklahoma, I'm in Mississippi trying to help him out.
Thanks
71 Satellite Sebring, all stock 1989 Dodge Daytona, daily driver 2008 PT Cruiser
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Re: 360 fouling plugs, with black soot out of pipe on start
[Re: russ71satellite]
#176764
12/27/08 11:43 PM
12/27/08 11:43 PM
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Joined: Jan 2003
Posts: 1,482 Lake Orion, MI
goldduster318
pro stock
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pro stock
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Lake Orion, MI
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Does it burn oil? If not it sounds like its pig rich. I'd check the ignition timing first and then start pulling fuel out by leaning the jets.
I know my 360 (with magnum heads) has the stock plugs for a 96 ram and a holley 600 that came with the engine when I bought it and man the thing is awesome. Cleanest exhaust i've ever seen on a muscle car and it runs great too.
'70 Duster 470hp 340/T56 Magnum/8 3/4 3.23 Sure-Grip
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Re: 360 fouling plugs, with black soot out of pipe on start
[Re: MoparforLife]
#176771
12/28/08 09:58 AM
12/28/08 09:58 AM
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Joined: Nov 2005
Posts: 93 Anacortes, WA
russ71satellite
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thanks for the help guys, makes sense. It runs rich all the time. For the longest time it would stay on choke too long, even in warm weather. It would eventualy kick off choke. I adjusted the fast idle down a bit and it seemed better, but will have him look at choke again.
71 Satellite Sebring, all stock 1989 Dodge Daytona, daily driver 2008 PT Cruiser
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Re: 360 fouling plugs, with black soot out of pipe on start
[Re: russ71satellite]
#176772
12/28/08 10:02 AM
12/28/08 10:02 AM
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Joined: Nov 2005
Posts: 93 Anacortes, WA
russ71satellite
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oh...and also...no oil burning. pretty fresh rebuild. He called me last night, and said dist. hold down bolt had come loose and he suspected timing problem. I had him find TDC, and he's at least in the neighborhood, but his timing light quit working....
71 Satellite Sebring, all stock 1989 Dodge Daytona, daily driver 2008 PT Cruiser
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Re: 360 fouling plugs, with black soot out of pipe on start
[Re: russ71satellite]
#176776
12/28/08 11:57 AM
12/28/08 11:57 AM
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Joined: Nov 2005
Posts: 93 Anacortes, WA
russ71satellite
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On mixture....i had him turn the screws all the way in.
How many turns out should I start him on with the mixture?
71 Satellite Sebring, all stock 1989 Dodge Daytona, daily driver 2008 PT Cruiser
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Re: 360 fouling plugs, with black soot out of pipe on start
[Re: stumpy]
#176778
12/28/08 12:47 PM
12/28/08 12:47 PM
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Joined: Jan 2003
Posts: 10,968 Hampton, Ga.
70dart360
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Green Meister
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Hampton, Ga.
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since it seem rich all the time have you checked the float levels? The feul my be dripping over and puddling in the intake over night.
70 Dart Swinger
72 D-100 440 shortbed
76 Pinto, 68k 21mpg!
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Re: 360 fouling plugs, with black soot out of pipe on start
[Re: 70dart360]
#176779
12/28/08 06:26 PM
12/28/08 06:26 PM
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Joined: Nov 2005
Posts: 93 Anacortes, WA
russ71satellite
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I think the float levels are ok, because this carb has the sight windows, and I have it set just below the windows, per instructions.
Update: he got rid of the choke and it seems to be running alot better. He's going to need to at least get a manual choke going, though.
thanks for the info everyone...
71 Satellite Sebring, all stock 1989 Dodge Daytona, daily driver 2008 PT Cruiser
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