Spark Plug Gaps?

Jekyl

New Member

Mar 31, 2005

93

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0

Calgary AB

May 6, 2005

#1

• May 6, 2005

• #1

I just bought Autolite 25s and I am not sure what I should gap them.. Let me know please!!

Thanks

P.S. I know this seems like a pointless thread but I need to know so sorry.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,157

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May 6, 2005

#2

• May 6, 2005

• #2

0.052" - 0.056"

 

TomCat

New Member

Apr 19, 2005

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Utah

May 6, 2005

#3

• May 6, 2005

• #3

Yep, I think .054" is what most would recommend.

 

5

5.0alltheway

New Member

Mar 30, 2005

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carolina

May 6, 2005

#4

• May 6, 2005

• #4

.044 is what i run

 

C

cheddarbacon

New Member

Apr 17, 2005

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May 6, 2005

#5

• May 6, 2005

• #5

y?

5.0alltheway said:

.044 is what i run

Click to expand...

y?

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,157

17,849

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Massachusetts

May 6, 2005

#6

• May 6, 2005

• #6

cheddarbacon said:

y?

Click to expand...

That's the gap for E6 heads on an '86 Mustang.

Some reference manuals incorrectly used this as the gap for all 85-93 Mustangs.

I beleive all 79-86 Mustangs use 0.044" as their gap.

In 1987 Ford upgraded the ignition and 0.054" is the new gap.

 

SteedaGT9150

Advanced Member

Nov 10, 2004

1,351

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68

Maryland

May 6, 2005

#7

• May 6, 2005

• #7

.054 is what i run too

 

Curse

Member

Apr 8, 2004

791

2

16

El Paso, TX

May 6, 2005

#8

• May 6, 2005

• #8

.050 on mine, might change it to .051 just to be different

 

5spd GT

"the 5.0 owns all"

Founding Member

Aug 7, 2002

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Arkansas

May 6, 2005

#9

• May 6, 2005

• #9

I have had better luck at the lower end of the .052-.056 range with the stock heads. It ran better...closer to .050.

 

notchback

Founding Member

May 30, 2000

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St Clair Shores MI

May 6, 2005

#10

• May 6, 2005

• #10

stock gap is .054"
i use about .045 for teh tighter spark
plus i occasionally spray...so i leave it closer

the car can actually run better at lower gaps when your ignition is tapped out

if spark is getting weak....use .040-.045

 

9

95GTAODE

New Member

Nov 25, 2004

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May 6, 2005

#11

• May 6, 2005

• #11

Mustang5L5 said:

That's the gap for E6 heads on an '86 Mustang.

Some reference manuals incorrectly used this as the gap for all 85-93 Mustangs.

I beleive all 79-86 Mustangs use 0.044" as their gap.

In 1987 Ford upgraded the ignition and 0.054" is the new gap.

Click to expand...

'79-85 is .052-.056

I hope that u are not using 24's or 25's in those '86 heads. They take a Motorcraft extended tip AWSF or AGSF type plug, which translates to a Autolite 103,104, or 764.

 

TomCat

New Member

Apr 19, 2005

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Utah

May 6, 2005

#12

• May 6, 2005

• #12

I think I'm gonna go with .050 on my NGKs and see how that runs.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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May 7, 2005

#13

• May 7, 2005

• #13

me: 25's at .050" (i like to have some fudge factor for the ignition).

 

NosPony

New Member

Apr 2, 2004

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Canton, Il

May 7, 2005

#14

• May 7, 2005

• #14

The wider the better to a extent. I have mine at 55 right now. Probably going to try 60 or a bit higher.

 

5spd GT

"the 5.0 owns all"

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May 7, 2005

#15

• May 7, 2005

• #15

NosPony - Only if you had a nice sparking ignition system like an aftermarket set from Crane or MSD. Mine is old and untouched besides different wires everything else is factory original or OEM replacements...my car ran better with the lower gap...

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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May 8, 2005

#16

• May 8, 2005

• #16

to augment what David brought up, there is a school of thought floating around that wider is not necessarily better (thanks to cheap dyno pulls - people test this kind of junk).
one can get better results from less gap (just like there is a point of diminishing returns with timing advance, but before detonation). Not really any reason (I see) to run on the edge of misfiring.