Spark Plugs

Cobain03

Active Member

Aug 27, 2003

996

0

36

Lexington, Ky

Oct 19, 2005

#1

• Oct 19, 2005

• #1

are the high dollar plugs anybetter then the normal ones? such as the four prong vs single? i know they prolly are but could someone explain?

 

Max Power

Active Member

Jul 31, 2003

1,774

1

36

St Paul

Oct 19, 2005

#2

• Oct 19, 2005

• #2

Usually not.

If you are not misfirng, you don't need them.

 

R

ravenblack67

New Member

Apr 2, 2005

46

0

0

Oct 19, 2005

#3

• Oct 19, 2005

• #3

I'm sure there is some difference but would you even notice it? Timing, carb, fuel quality, exhaust, general engine condition, coil, points, wires are all significant variables in performance. I put my money into intake and exhaust as well as electronic ignition.

 

65ShelbyClone

Founding Member

Sep 9, 2000

4,675

38

119

Antelope Valley, SoCal

Oct 20, 2005

#4

• Oct 20, 2005

• #4

No, they are not worth the money. They are a gimmick marketed to people who dont know how flame propagation works(ie, anyone who cant change their own sparkplugs).

The sparkplugs that came in most cars built in the last four decades did the job as they should. As we get more and more smog regs, the engineers have to consider new ways to meet them. Ironically, basic sparkplug design hasnt changed.

 

thumper460

Founding Member

Jul 24, 2000

3,022

2

56

Orange Park , Fl

Oct 20, 2005

#5

• Oct 20, 2005

• #5

We used to "side gap" the plugs for racing.. giving MORE flame to the fuel.. all these NEW ideas are old ideas.. just factory made!! cool?? With a carb ect .. plugs become fuel foul long befor they wear out.. stay copper core.. experiment with heat ranges and that is better off!! $7.00 a plug..?? come on!! LOL

Just me.............................

Thumper

 

J

jbuening

Member

Apr 28, 2005

399

0

17

Oct 20, 2005

#6

• Oct 20, 2005

• #6

I bought a set of Bosch Platinums, still has a single prong but were the same price as the standard plugs were so why not? Did i notice any difference? Nope. Some claim you will get better fuel economy, you can increase your economy by the way you drive your car. Isn't really a way to prove they help IMO

 

LMan

Founding Member

Aug 10, 2002

1,246

0

0

Mom's basement

Oct 20, 2005

#7

• Oct 20, 2005

• #7

save your money.

 

HistoricMustang

Active Member

Apr 11, 2003

2,359

0

46

Confederate States of America

Oct 20, 2005

#8

• Oct 20, 2005

• #8

Here you go:

http://www.badasscars.com/techtips.html#Anchor11

Damn good tech even if from a Chevy guy!

HistoricMustang
www.historicmustang.com

 

F

ForceFed70

That's why they call it "dope"

Founding Member

Dec 6, 1999

4,818

1

69

BC Canada

Oct 20, 2005

#9

• Oct 20, 2005

• #9

Standard platinum plugs are the only "performance" plugs that have any benifit. And even then, they're only better because they last longer.

 

65ShelbyClone

Founding Member

Sep 9, 2000

4,675

38

119

Antelope Valley, SoCal

Oct 20, 2005

#10

• Oct 20, 2005

• #10

thumper460 said:

$7.00 a plug..?? come on!! LOL

Click to expand...

The Denso Iridiums were roughly twice that when they came out not too many years ago. The rice crowd couldnt wait to spend $60 on plugs for a Honda.

 

68 Coop

New Member

Aug 13, 2005

104

0

0

Mesquite, NV

Oct 21, 2005

#11

• Oct 21, 2005

• #11

Get yourself a set of Autolite 45's, gap them at around .034 or a LITTLE more, and you should be good to go.

 

shotsy

New Member

Apr 8, 2005

233

0

0

Oklahoma City

Oct 21, 2005

#12

• Oct 21, 2005

• #12

is .45 too much gap for a 9.5:1 compression ratio on a 351C with the durraspark conversion? Sorry to hijack BTW

 

68 Coop

New Member

Aug 13, 2005

104

0

0

Mesquite, NV

Oct 21, 2005

#13

• Oct 21, 2005

• #13

Well, I gapped mine at .040, and they don't seem to work as well as .034. I am going back to the old gap on the next change. So to answer your question, in my opinion, YES IT IS.

 

6

66StangFastback

New Member

Jun 6, 2005

181

0

0

norman, oklahoma

Oct 21, 2005

#14

• Oct 21, 2005

• #14

0.034 is spec gap for spark plugs on the 289. I don't know about the 351s but I do have the manual that says if anyone needs to know.

 

shotsy

New Member

Apr 8, 2005

233

0

0

Oklahoma City

Oct 22, 2005

#15

• Oct 22, 2005

• #15

I was affraid that I gapped em too big before I dropped the motor in, guess that I'll have to jack the motor and re gap them, could that cause me to run a little rich at idle if the spark isnt hot enough?

 

cas69aus19

New Member

Sep 14, 2005

50

0

0

B-town NV

Oct 22, 2005

#16

• Oct 22, 2005

• #16

I have heard that if you gap them to much like .045 that the compression can blow the spark out and cause problems..

 

J

jbuening

Member

Apr 28, 2005

399

0

17

Oct 22, 2005

#17

• Oct 22, 2005

• #17

shotsy said:

is .45 too much gap for a 9.5:1 compression ratio on a 351C with the durraspark conversion? Sorry to hijack BTW

Click to expand...

What kind of cam do you have in there? If it is a stock cam, start out with 0.40 and work your way up. My cam is bigger than stock and it seems to work the best with a gap of 0.50 and i too have a duraspark box. I know people that run up to 0.60 with a multiple spark box and hot cams and the gap was set by dyno tuning.

 

65ShelbyClone

Founding Member

Sep 9, 2000

4,675

38

119

Antelope Valley, SoCal

Oct 22, 2005

#18

• Oct 22, 2005

• #18

Unless you have a high energy coil, .035 is probably the safe max. I know that EFI 5.0s like I had specified somwhere around .050-.054, but the stock TFI coil and distributor were about like aftermarket parts already.

 

cas69aus19

New Member

Sep 14, 2005

50

0

0

B-town NV

Oct 22, 2005

#19

• Oct 22, 2005

• #19

So what would be a good gap to set with the accel 300+ box, coil, dist, and wires.?.

 

shotsy

New Member

Apr 8, 2005

233

0

0

Oklahoma City

Oct 22, 2005

#20

• Oct 22, 2005

• #20

Jacked the motor today and regapped the plugs to .35 and it seems to run better. I only broke one plug coming out and busted 2 knuckles. I love my cleveland