Re: Spark Plug wires resistance.

["content22207" <brobertson@xxxx>]

Have stated before that Bosch wires are really quite nice. Are spiral
core, which is what MSD and Pertronix recommend for their high voltage
applications (vs solid core). Not too keen on Bosch plugs or coils,
but their wires are nice.

Racing folks have wires that are 100-200 ohms each, but cost $150 a
set (aren't umbrella boot either). Also don't know how much RFI
supression they offer.

In the bad old old old days wires were copper core. No resistance, but
they chewed up radio reception. Could also arc something fierce when
jacket got old and cracked.

Have been several ignition threads of late. IMHO this is bigger
problem than fuel system will ever be AFTER THE TANK (DeLo Achilles heel).

Don't forget to check resistance of spark plugs too. Some
"wonderplugs" are 25,000 to 50,000 ohm!

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@xxxx> wrote:
> Group, I checked the resistance on 3 sets of spark plug wires this 
> weekend and found a big difference. The resistance was measured with 
> a B&K Multimeter in the $100.00 varity and was from end connector to 
> end connector.
> 
> Set#1. AutoZone, Omnispark. 7mm. All wires were around 5 to 6 thousand
> ohms, which is fine for normal driving and RFI suppression.
> ( Radio interference.)But a little high.
> 
> Set#2. Bosch, 7 mm. All wires were under 1000 ohms. Still offers RFI
> protection but better to deliver more voltage to the plugs
> for a hotter spark.
> 
> Set#3. Taylor 8MM Pro Wires,Wires I'm working on and all are
> consistance at around 500 ohms of resistance or less. 
> Less resistance without going to solid wire is best for
> street use. Won't cause as much interference.
> 
> Moral of the story is, If your experiencing maybe a cylinder that the 
> plugs don't look like they are burning good or there is a idle mis 
> but seems to disappear after you get going, it may be the wires. A 
> bad internal connection when crimped will increase the resistance. I 
> have seen as high as 25,000 ohms on a wire and will almost kill the 
> spark at idle on a plug. Take your wires off and clean them or 
> replace them and check them for resiatance. Also, Carbon tracks will 
> build up in the distributor cap, rotor and wires and conduct 
> electricity and cause a firing short or a plug that the spark is weak.
> Call or email me if you need or want more information.
> Just a FYI
> John Hervey
> www.specialTauto.com