spark plug gap??

pedley · 07-22-2003, 01:14 PM

i have an 88 gt not stock but, i need to know the gap of the plugs before i put new plugs in it.

i didn't gap the last ones b/c i didnt know but i want to do everything right so i must gap them this time
thanks

QuantumMotorsports · 07-22-2003, 01:51 PM

I believe it's something like .054 inches, which would be 54 thousanths of an inch. I may be wrong.

bigred90gt · 07-22-2003, 02:21 PM

.054" is the stock gap. Need more info on what exactly "not stock" means.

84gt347 · 07-22-2003, 02:21 PM

i say .045, if you have a stock coil, and are n/a

pedley · 07-22-2003, 10:53 PM

well its not all stock anyway

f cam,65mm tb,underdrives,ported stock upper and lower intake,ported and shaved heads.

yes i know i need to get rid of the stock intake but i dont have the money for a gt 40 intake

so should i use the gap of .054 or ???

lx mike · 07-23-2003, 05:59 AM

.054 will be fine.

PKRWUD · 07-23-2003, 06:32 AM

You didn't mention the ignition in your list of mods. If you shaved the heads, then the compression is slightly higher, which means the gap should be less. With a stock coil, I'd start at .045", but that's just me.

Take care,
~Chris

84gt347 · 07-23-2003, 11:28 AM

Quote:

Originally posted by PKRWUD
You didn't mention the ignition in your list of mods. If you shaved the heads, then the compression is slightly higher, which means the gap should be less. With a stock coil, I'd start at .045", but that's just me.

Take care,
~Chris

i love it when someone agrees with me

crazypete · 07-24-2003, 07:32 AM

So lets say that a person has a nice msd al6 and a big fat coil to match.... I've read all these claims that opening up the plug gap will make a bigger spark and get better milage and more power and so on. Should I? And if I do, by how much should I open it up?

84gt347 · 07-24-2003, 05:36 PM

I have that setup and nitros oxide and i set my gap at .055. i might use .065 n/a but i'd test it befor i depend on it.

PKRWUD · 07-25-2003, 05:09 AM

Quote:

Originally posted by crazypete
So lets say that a person has a nice msd al6 and a big fat coil to match.... I've read all these claims that opening up the plug gap will make a bigger spark and get better milage and more power and so on. Should I? And if I do, by how much should I open it up?

Stock compression? Go for it. Compression is a bigger issue than your ignition system when it comes to deciding your best gap, but ignition quality is important. If your running stock compression, and spent the money on ignition "upgrades", then go ahead and take it up to .060", if you want to, but listen for pinging.

crazypete · 07-27-2003, 02:08 PM

the .65 works like a charm! I can feel a little difference in power but a lot of difference in idle and smoothness. Cool

84gt347 · 07-28-2003, 10:21 AM

did you put in new plugs when you opened up the gaps?

crazypete · 08-01-2003, 09:56 AM

Nope, actually, these were the same old bosch platinum plugs that have been riding along in the motor for 2 years. If anything, they looked a little whitish from being lean but nothing serious. It worries me that these plugs have a microscopic pin of an electrode. Makes me think that they'll get clogged by some debris but hasnt happened yet. Oh yeah and 1 plug doesnt match the rest. The set is a bunch of r3 131's and plug #5 is an r3 289. I broke one off and noone had these plugs anywhere except autozone and their computers reccomended the 289.

07-22-2003, 01:14 PM	#1
pedley Registered Member Join Date: Jul 2003 Location: canada Posts: 74	spark plug gap?? i have an 88 gt not stock but, i need to know the gap of the plugs before i put new plugs in it. i didn't gap the last ones b/c i didnt know but i want to do everything right so i must gap them this time thanks

07-22-2003, 01:51 PM	#2
QuantumMotorsports Registered Member Join Date: Jul 2000 Location: Norman, Oklahoma, USA Posts: 597	I believe it's something like .054 inches, which would be 54 thousanths of an inch. I may be wrong. __________________ Michael Black QuantumMotorsports Norman, OK 1984 LX Hatch 306 w/ TRW forged flat toppers, Comp Cams Magnum 292H, GT40P heads w/ 3 angle valve job, .550 lift springs, Angus Racing Roller Rockers, Weiand Stealth Intake, Holley 4150 650cfm carb, MAC 1 5/8 Long Tubes, Single Chamber Flowmasters, 91' T5 w/ Pro 5.0 shifter, Turbo Coupe 8.8 Rear w/ 3.55 gears, QA1 Motorsports tubular K member, no interior except steering wheel and seat. Coming soon: 6 or 8 point cage, Fuel Cell, Weld Draglites

07-22-2003, 02:21 PM	#3
bigred90gt 2 Stangs in the Stable Join Date: Apr 2002 Location: Baytown, TX Posts: 1,209	.054" is the stock gap. Need more info on what exactly "not stock" means. __________________ '90 GT Under construction Best E.T. = Fast @ High Speeds - OK So I Lie. So What!!! 04 F-150 STX 4.2L 5 spd Rice Haters Club Member #128

07-22-2003, 02:21 PM	#4
84gt347 Registered Member Join Date: Mar 2002 Location: sherwood Forest Posts: 291	i say .045, if you have a stock coil, and are n/a __________________ 84 gt350 89 lx vert 92 lincoln lsc. All Forced ( one way or another)

07-23-2003, 05:59 AM	#6
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	.054 will be fine. __________________ Rice Haters Club Member #101

07-22-2003, 10:53 PM	#5
pedley Registered Member Join Date: Jul 2003 Location: canada Posts: 74	reply to not stock well its not all stock anyway f cam,65mm tb,underdrives,ported stock upper and lower intake,ported and shaved heads. yes i know i need to get rid of the stock intake but i dont have the money for a gt 40 intake so should i use the gap of .054 or ???

07-23-2003, 06:32 AM	#7
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	You didn't mention the ignition in your list of mods. If you shaved the heads, then the compression is slightly higher, which means the gap should be less. With a stock coil, I'd start at .045", but that's just me. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

07-24-2003, 07:32 AM	#9
crazypete Registered Member Join Date: Sep 2002 Location: Boston Posts: 592	So lets say that a person has a nice msd al6 and a big fat coil to match.... I've read all these claims that opening up the plug gap will make a bigger spark and get better milage and more power and so on. Should I? And if I do, by how much should I open it up? __________________ 91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior

07-24-2003, 05:36 PM	#10
84gt347 Registered Member Join Date: Mar 2002 Location: sherwood Forest Posts: 291	I have that setup and nitros oxide and i set my gap at .055. i might use .065 n/a but i'd test it befor i depend on it. __________________ 84 gt350 89 lx vert 92 lincoln lsc. All Forced ( one way or another)

07-27-2003, 02:08 PM	#12
crazypete Registered Member Join Date: Sep 2002 Location: Boston Posts: 592	the .65 works like a charm! I can feel a little difference in power but a lot of difference in idle and smoothness. Cool __________________ 91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior

07-28-2003, 10:21 AM	#13
84gt347 Registered Member Join Date: Mar 2002 Location: sherwood Forest Posts: 291	did you put in new plugs when you opened up the gaps? __________________ 84 gt350 89 lx vert 92 lincoln lsc. All Forced ( one way or another)

08-01-2003, 09:56 AM	#14
crazypete Registered Member Join Date: Sep 2002 Location: Boston Posts: 592	Nope, actually, these were the same old bosch platinum plugs that have been riding along in the motor for 2 years. If anything, they looked a little whitish from being lean but nothing serious. It worries me that these plugs have a microscopic pin of an electrode. Makes me think that they'll get clogged by some debris but hasnt happened yet. Oh yeah and 1 plug doesnt match the rest. The set is a bunch of r3 131's and plug #5 is an r3 289. I broke one off and noone had these plugs anywhere except autozone and their computers reccomended the 289. __________________ 91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior

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