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hotroddr 10-08-2006 05:49 PM

resistance of plug wires?
My new motor,1000miles has a fouled plug.I checked resistance of wire (Taylor)to that cylinder-around 15Kohms. Would I get a hotter spark going to a non-resistance wire? Thanks for the help! Bill :)

paulo 1 10-08-2006 07:33 PM

Avoid using solid plug wires.They cause too much magnetic field pulsing.Even race-cars don't use them anymore.Your dirty plug should be suffering from a different problem.Let me guess,must be a GM with that tiny O-ring valve stem oil seal?

hotroddr 10-08-2006 07:52 PM

Hi Paulo, Thanks for the input- yup SBC, Vortec heads, I think they have an improved seal, don't they? I don't get a lot of smoke from the bad bank on start-up or long idle, so I'm guessing rings haven't seated? Bill :)

paulo 1 10-08-2006 08:11 PM

OK.Yes the modern Vortech does use much better seals ,fixed to the guides.
But lets see,it is definitely a problem isolated to that one cylinder only.You could even try swapping wires but I do not think it is the guilty part.Swapping plugs... If it is a multi point injection fuel system,you could have a bad injector.If it is TBI equipped or carbureted,it would more likely be a mechanical problem.How about checking the manifold port of that cylinder sucking for instance,ATF up the tranny tubing?

hotroddr 10-08-2006 09:04 PM

Thanks for the thoughts,Paulo. I thought of the ATF- line to intake looks bone dry. Carburated, I keep changing plugs to keep the cylinder firing-#8 is the culprit. #6 a little dark and crusted, but fires. The rest are light brown. I don't know if 15K ohms is normal or not- thanks, Bill :)

docvette 10-09-2006 12:21 AM

Doc here, :pimp:

If your running STOCK 8 MM Taylor replacement resistor wires..the resistance per foot is:

8mm Resistor Silicone/EPDM ---->*3500*<---- 500F 354-44R354-26R yellowblue

3500 ohms per foot..

Taylor carries MUCH better the 8.5 spiral core wire that is 350 ohms per foot..

Here is their site:

Taylor wire products

Doc :pimp:

hotroddr 10-09-2006 07:58 PM

Thanks,Doc. If I purchase the better wires with the resistance decrease of an order of magnitude, will the plug have a hotter spark? Thanks, Bill :)

hotroddr 10-09-2006 08:00 PM

Doc, another question for the pro- if I run shorter wires, i.e. over the cover rather than up from underneath, will the spark be hotter? Thanks again, Bill :)

docvette 10-09-2006 08:03 PM

Doc here, :pimp:

It will sure help to a degree..

You might also try reducing the plug gap on all or just the offenders..see if that helps some also.

Doc :pimp:

docvette 10-09-2006 08:05 PM

Doc here, :pimp:

Plug wire resistance is measured by the foot..the shorter the run, the lower the resistance..So yes..It may help in that regard also.

Doc :pimp:

hotroddr 10-09-2006 08:09 PM

Thanks Doc- you're the best. Stupidly, I had opened the gaps a little. I'll order the better wires from Summitt. Bill :)

docvette 10-09-2006 08:23 PM

Doc here, :pimp:

Wider gaps make it a bit harder for a spark to jump with a weak spark..close them down about 5...from standard.

Doc :pimp:

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