What spark plugs do SC's like??
 

What plugs should I put in my SC ? What do you guys use??? ...

1978/'79 - W8DC Bosch
1980-'83 - W5DC Bosch

Bosch has made some changes to their plug line, so you might have to buy the "newest" version of the above plugs...

+1
Whatever your manual calls for unless changes were made from stock like CR or CDI.

If you have stock Beru connectors, check the resistance, it's often neglected.
Short connectors on cap: 1k OHMS
Long connectors on plugs: 3k OHMS
End to end: ~4k OHMS total.

A digital multi-meter is best.

You may find the odd one with much higher reading; time to replace. :)

Thanks, I was actually planning to replace my plug wires, because I saw one sparking to the tin on the passenger side while running! What do you think about the magnecore wires?? what wires would you recommend?

i use NGK BP6ES.

Replacing wires is good but are you keeping the Beru connectors?
I just replaced the wires with new 8mm off a roll (No shield), kept the Beru connectors and I just check them occasionally for resistance.
Lots of people go with Magnecore and don't like the Berus.
Any quality wires will do. If you go more than 7.5 mm, the stock holders will be a tight fit.
Like JW, I use NGK 6BPES now but W5DC worked o.k.

For tires, it depends what wheels you have. If stock, stay with stock sizes.
I have 16"Fuchs; 7's in front and 8's in the rear but I stay with stock 205/55 front and 255/50 rear Bridgestone Pole Position, a middle of the road tire with good performance and good mileage.

Some people go wild and mount bigger tires but I don't see the point.

On a CIS car you MUST use the OEM-Style Stainless Steel Braided wires unless you want to flirt with a major fire. The CIS system routinely leaves fuel vapors and ungrounded wires where a spark can ignite would not be a good thing... There are Porsche branded and there are aftermarket made by the same company (Beru). They are the same wire. Just make sure its the braided/grounded wire made for the CIS car.

Huh.......Routine fuel vapors with CIS?
O.K. Learned something new.

CIS or DME or carbs or MFI can have fuel leaks.
Any system has the potential for fire when old brittle ignition wires are combined with fuel leaking.
The answer is to have good wires.
Many people have removed the stock harness with the shields and used different wires. (The shielded ones are very expensive!)
I think Porsche used the shields to prevent anyone from getting zapped accidentally plus noise reduction for the radio?

But, it's up to the individual. Get OEM shielded wires if you feel better.

What is the advantage of the buru connectors vs a new set of wires like the magnacor's?

I think this is an urban legend. I thought the original story was that Porsche was attempting to solve the backfiring-through-the-airbox problem with these braided wires?

Anyway, braided wires have no value over non-braided versions.

Actually, that's the "Urban Legend." The braided plug wires were installed to control possible sparks to avoid blown airboxes. It's no secret that fuel residue remains inside the plenum chamber of the airbox, and during starting, when atomized fuel and air are added, that residue can have a violent reaction if a stray spark finds its way under the airbox. The grounded plug wires were one of many steps that the factory took to protect the airbox on CIS cars, as evidenced by the fact that some '81-83 cars got well over 100K miles from their original box.

If you're going to replace your wires, I highly recommend that you buy a set of o.e. braided wires complete with new connectors at the cap and plug ends; Pelican probably sells them and would be a good source.

I used the stock Bosch plugs.

Gunter, when checking the resistance on the connectors, how do you go about that? Obviously checking the whole wire is simply measuring from one end ot the other, but just the connector?

My car, believe it or not still has it's original braidied wires, though they do look tired.

My long Berus can be unscrewed from the wire.

The short ones unscrew as well.

If your probe isn't long enough, stick a small Phillips screwdriver into the long connector and touch the probe to it.

Fom my many years of SC ownership that is the first I heard of this. Interesting. I'll keep my newer magnecor wires though.

i have been using magnacors for 5 years now with no complaints. i think my sc performs better with the ngks vs the bosch plugs.

roger

i run the NGK's and Magnecore. i was told that there was a chance that when i added the MSD 6AL it could (due to the stronger and more spark) arc through the old stock wires and fry something!!! so i swapped it all out.....

I had problems getting the magnacores to stay on the plug. I had to clamp them down tighter and still sometimes they slip off the plug.

Same here

Is there any resistance in the Magnecore connectors or wires?
How does one obtain individual, single Magnecore connectors if needed?

I like Berus because if one connector fails, I can obtain single ones and just exchange.
How to do that with Magnecore?

Is it common for the connectors to fail? for beru? for magnecor?