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Old 07-16-2013, 05:22 PM   #1
BiminBlue92
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Spark plugs

You all know my lil stock 302. I am replacing the plugs and wires after vacation. Is there any benefit to using a more expensive plug? I assume not too much with a stock motor?
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Old 07-16-2013, 06:06 PM   #2
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I would run either autolite regular plugs or stock motorcraft plugs. But i would get a good set of wires for it.
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Old 07-16-2013, 06:08 PM   #3
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I am a NGK or Motorcraft fan. Never had a problem with them. I would change the wires, cap and rotor as well.
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Old 07-16-2013, 06:16 PM   #4
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I was planning on OEM plugs from Ford Motorcraft and Ford Racing wires. I will look into cap and rotor while I am at it.
Thanks guys.
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Old 07-16-2013, 06:40 PM   #5
01snakesvt
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The ford racing wires are nice. I would get good cap and rotor to go with the wires
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Old 07-17-2013, 03:13 AM   #6
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i wouldn't buy any wire other than Taylor Thundervolt 8.2mm P/N 84058 (or 10.4mm if the application calls for it). only 50ohms/ft resistance . somebody used to have a wire advertised at 25ohms/ft but i don't recall who it was. Moroso has the Ultra 40 but they cost quite a bit more than the the Taylors for only a 10ohm/ft improvement. it's been quite a long while since i've checked any wires but i'm thinking the last set of Ford Racing wires i checked were around 800ohms/ft. i believe factory wires were around 1000-1200 (for Fox & SN95)

---------- Post added at 01:41 AM ---------- Previous post was at 01:02 AM ----------

while trying to find the 25ohm wires, i came across this educational post:


"I'm an electrical engineer, specializing in the RF domain. I can tell you unequivocally that the series resistance makes no difference in the overall performance of the wireset. In fact, lower resistance will raise EMI emissions and that's NOT a good thing.

A little circuit analysis now. The coil is simply a high voltage source. There are 2 resistors connected to that source, one is the resistance of the wire (very low), the other is the resistance across the plug gap (very high). Voltage division will occur proportionately across these 2 resistors.

If Vc=voltage of coil, Vg=voltage across gap and Vw=voltage acoss wire then:

Vg=Vc*Rg/(Rg+Rw) this means voltage across the gap=the coil voltage times the gap resistance divided by the total resistance. As long as the gap resistance is much higher (say 1000 times) than the wire resistance then the wire resistance is trivial in figuring the voltage applied across the gap. Also, the current flow is extremely low, so total power delivered is actually very low. It's the high voltage that causes the ionization of the gap, not the current or power. (However more power is required as cylinder pressures rise)

Buy plug wires based on cost, insulation thickness and heat resistance and don't even think about the wire resistance."


i'd never considered how trivial the wire resistance might be with regard to the resistance of the plug. although we already knew that lower resistances makes for higher EMI, i've never known it to be a problem at the levels we're dealing with. nonetheless, when I can get the Taylor Thundervolt wires for only a few dollars more than most of the other major brands...i'll take all the help i can get


---------- Post added at 01:51 AM ---------- Previous post was at 01:41 AM ----------

now that ultra-low resistance may be a mute point, i've found the 25ohm wires:

"Crane Cams Performance Plug Wires

8.5mm Fire Wire


Only 25 Ohm per foot resistance!

Double-silicone reactive core spark plug wire sets.

Up to 50% more spark energy!

FireWire’s low 25 Ohm-per-foot resistance transmits up to 50% more energy to
the spark plugs than other “performance” suppression core wires.

8.5mm pure silicone double-layer construction!

Our 8.5mm “silicone-on-silicone” design resists high under-
hood temperatures and insulation breakdown caused by
abrasion. Designed for use on tube-steel header equipped
racing engines

State-of-the-art “reactive core” filters RFI!

FireWires actually filter out RFI and EMI noise generated by today’s
high-output ignition systems, protecting on-board computer systems and instruments!

High performance 550 degree boots"


---------- Post added at 03:13 AM ---------- Previous post was at 01:51 AM ----------

well i think i've turned my down time into a little learning experience tonight. given my field for the past 20 years or so, i'm a bit disappointed with myself. i was looking so close at the resistance that i was completely over thinking the issue. i'd never run the numbers before or i would've discovered how much time i was wasting on an inconsequential issue. here's a quick breakdown using some common parts:

Ford Racing wires at 800ohms/ft with an average wire length of 27-1/8" (93 5.0) create a loss of ~87.5 volts.

Taylor Thundervolt wires at 50ohms/ft with the same average wire length create a loss of ~5.5 volts.

An MSD TFI coil is advertised to produce 44,000 volts at 220mA peak

All of the preceding factors equate to the following:
Ford Racing wire losses ~ .198 %
Taylor Thundervolt losses ~ .012 %

So, the way i see it, as long as you stick with a reputable brand name (<1000ohms/ft with equivalent insulation) you will never exceed a maximum average loss of < .25% voltage drop to the plug.

i can't believe how much time i've spent over the years measuring the resistance of plug wires but never taking the time to truly figure out what those numbers did for me .

Bottom line - i'm glad i never spent big on the Moroso or Davis wires
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Last edited by SlowGT; 07-17-2013 at 01:09 AM. Reason: add part number
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Old 07-18-2013, 04:45 PM   #7
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Finally someone admits that they over-thought something that really doesn't matter much.
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Old 07-23-2013, 10:17 PM   #8
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Re: Spark plugs

Autolite copper plugs all the way on a stock or mildly modded car
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Old 07-24-2013, 10:07 AM   #9
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Autolites or NGK

Moroso unshielded ultra 40's $65 from summit...there is not a better wire anywhere in the ball park for performance vs money spend.
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Old 08-01-2013, 11:12 AM   #10
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Recommended spacing?
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Old 08-01-2013, 11:56 AM   #11
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boosted or n/a? Stock ignition or aftermarket?
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Old 08-01-2013, 12:53 PM   #12
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stock, stock, stock
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Old 08-01-2013, 02:45 PM   #13
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shoot, that's easy then, STOCK PLUG GAP!! (.054)
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Old 08-01-2013, 03:28 PM   #14
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Gap tool has .05 on it?
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Old 08-01-2013, 03:43 PM   #15
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get a new one! Autozone or any auto parts store has em for like 2 bux

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