Zylinder

Hello


What kind of wires should be used i my 1989 305 TPI Camaro ?


I have strong vibrations from idle up to ~ 1500U/min.
Perhaps from misfire.


I read about problems in combination with computer controlled cars and copper ignition wires. Is carbon core the only possible way ?


I use new MSD Wires MSD-35599 (Summit Number)
These are spiral design with a magnetic core.


What are the stock wires made of ?


Thanks.

Zylinder

No idea ?

305sbc

iTrader: (3)

Taylor makes some good ones, as well as MSD.
All the ones available will be compatible and not cause any problems. Just do a good job routing them so they don't burn.

Tibo

iTrader: (15)

The best option is to buy a DIY set of plug wires. They give you long lengths of wire, whatever style of boot you want, the installation tool and some dielectric grease. This way you route them exactly where you want them and can use any wire loom separators you want. I switched to this route after buying sets of MSD and Taylor and Accel and not being happy with the lengths.

Tuned Performance

iTrader: (92)

&

Pro

I dont know if it really matters much but I read due to firing order its important to keep wires 5 and 7 away from each other.

Tibo

iTrader: (15)

That's sounds like advice from 40 years ago because at least today the plug wires you'll find have uber thick insulation. You can hold a wire with the engine running and not get shocked. Wires 5 and 7 are right by each other on the cap and usually run side by side. I thought it also used to be an issue with radio interference if the insulation wasn't thick enough.

Vader

Tibo - It's not insulation breakdown which is a concern, but inductive losses.

However, to answer Zylinder's original question, stock wires are made of a semiconductive carbon pile filament with multi-layer silicone, XLPE, nylon, and EPR/silicone coverings. Resistances typically run about 200-600Ω per foot of length. That resistance is sufficient to suppress RF noise caused by "ringing" or sinusoidal spark decay, but in effect has no bearing on the wire's conductivity.

If you doubt this, simply use Ohm's Law to calculate the voltage drop along a 1,500Ω piece of wire with the current limited to a few milliamps. At the potential 40-45kV available from the ignition coil, the extra 1,500Ω has an effect on the order of magnitude of around 5 decimal places, or 0.00005% loss. In short (pun intended) there is far, far, FAR more resistance in the secondary winding of an ignition coil than the extra 0.5-1.5kΩ represents, yet no one usually considers that.

If you doubt this, hold the end of a resistor wire while someone cranks the engine, then try it again with a spiral wire type. See if you can tell the difference.