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Author
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Topic: Plug help needed
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stang106
Gearhead Posts: 780
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 08-14-2002 04:41 PM
   
Well, my 351W has been sleeved, new piston and all new rings now at 0.021 The car has developed a miss, severe at times and I don't know if it is the Crane conversion ignition or something else. The plugs are all black, and I suspect that oil is being sucked in from the lifter gallery. I want to run the car at the Port Alberni drags on Sat and Sun so I don't have a lot of time to make major changes. Could a different plug help in the meantime? I am running NGK UR6-4079. Also what plug gap should I run? The thermostat is 160.
Thanks,
Dave
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stang106
Gearhead Posts: 780
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 08-14-2002 04:45 PM
By the way, Dumb question, but how do you know for sure that black on a sparkplug is oil and not a too rich condition? I have a Holley 750 with 72 primarys.
Dave
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JCQuinn@work
Gearhead Posts: 826
From: Lakewood, CO, USA
Registered: Jun 2001
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posted 08-14-2002 05:19 PM
Look at your exhaust. If it is blue you are burning oil. If it is black you are way rich. If it is burning white you have a coolant leak.Simple answers from simple minds. John
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SteveLaRiviere
Administrator Posts: 43151
From: Saco, Maine
Registered: May 99
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posted 08-14-2002 06:13 PM
You should run .035" for a gap. Fuel will be dry and sooty, oil is slimey.By the way, why are you running so much ring gap? ------------------
All Fords since 1977!
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stang106
Gearhead Posts: 780
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 08-15-2002 12:59 AM
Funny Steve!
I showed the plugs to a mechanic who used to race and tune other people's cars and he took one glance and said its running rich. I gapped all plugs at 0.034" , checked all leads and plugs with my OHM meter, and I still have a miss. If no ideas from here I'll turn the car over to Al, who I mentioned earlier. BTW, he just sold his '68 Stang fastback big block four speed.
Dave
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SteveLaRiviere
Administrator Posts: 43151
From: Saco, Maine
Registered: May 99
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posted 08-15-2002 05:35 PM
quote:
Originally posted by stang106:
Funny Steve!
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All Fords since 1977!
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stang106
Gearhead Posts: 780
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 08-16-2002 03:01 AM
Steve,
I can take a joke, It was a good but expen sive learning experience. For those who don't know, I gapped my top two rings to Ford specs (0.016 - 0.018") on my Hyperutectic FM pistons, after it warmed up and I was spinning around 5500 RPM the top ring on #8 butted and pulled part of the piston off, the piston came up and slammed the piece into the head and cocked the piston through the cylinder wall. I'm now back up and running and after chasing down vacuume leaks the car is scary fast! I'll be racing Roger at the Port Alberni Drags on Sunday.
Dave
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SteveLaRiviere
Administrator Posts: 43151
From: Saco, Maine
Registered: May 99
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posted 08-16-2002 08:56 PM
I didn't know that's what happened. Sorry.Hypers are that sensitive to ring gap? I thought they were supposed to have superior expansive qualities? Man, the more I hear about them, the more I don't like them.  ------------------
All Fords since 1977!
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stang106
Gearhead Posts: 780
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 08-17-2002 02:49 AM
I don't like them now, either. I should have used a set of JE forged.
dave
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Hemikiller
Gearhead Posts: 606
From: Killingworth, CT
Registered: Feb 2002
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posted 08-17-2002 08:16 AM
Hypereutectics keep alot of the combustion heat in the chamber, and out of the piston. They are sensitive to ring gap only, which you must set to the specs which accompany your pistons. Nothing scary or odd, as all piston manufacturers recommend different endgaps and piston clearances depending on the intended use of the motor.
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