#1 Spark Plug Wire

[Benz Dr.]

I bought mine from Mercedes in 1995 part number 930-150-00-18 and they are similar to the ones Charles posted but are labeled with "Bosch-7MM Silicone-High Temperature" and has the 90 degree at the #1. They have Bosch metal ends 1 ohm as shown in my picture.

Does anyone know where I can get a straight Bosch metal end for my #1 to match my other 5? Also I noticed that they can be unscrewed from the wire but can't seem to unscrew mine. Am I missing something?

The end will get stuck on to the wire and you may need to carefully pry it off. I use a small amount of dielectric grease which makes assembly much more easily done. Make sure your coil wire is metal - many are carbon in that type of set.

[TJMart]

Thanks Pawel! Found on eBay and ordered.

Dan: Is this the correct coil metal core?

[Benz Dr.]

No, that's carbon core. You can find a piece of metal core wire then reuse the old boots and clips. I'm glad you included a picture so everyone can see what not to use.

[ja17]

Yep, that carbon core wire will add an additional 5K ohm resistance to each spark plug circuit. Not a good idea, especially if you are using the old original ignition and coil.

[TJMart]

Thanks Dan and Joe!

What surprised me the most is that Mercedes sold these type of wires. The coil wire is made up of the same wire that that go to the plugs so none of them are copper core. Joe I read a past post of yours that explained the 19k ohm total resistance for a transistorized ignition which my car has and decided to just purchase new ones that are correct.

I called up K&K and their wires are solid copper core with Bremi metal ends with 1K ohms resistance for the 250 and 280 SLs. Their price is going up 15% starting with their next shipment they get in. But the distributor ends are at 90 degrees. For my car it has the black plastic distributor cap cover so I need straight distributor end boots so I will salvage those from my old wires.

Authentic Classics also sells the plug wires and they appear to be the exact same as the K&K ones for $75 so I ordered a set.

Thanks to all for your posts! One learns something every day about our Beloved Pagodas!

Tony

[Benz Dr.]

Yep, that carbon core wire will add an additional 5K ohm resistance to each spark plug circuit. Not a good idea, especially if you are using the old original ignition and coil.

I measured a 14'' piece with my meter and it was over 10K ohms! Not good.......

[ja17]

Interesting Dan, if you think about it, the resistance will increase with the length of the wire?. Cut it in half and check again to verify 

[Benz Dr.]

Interesting Dan, if you think about it, the resistance will increase with the length of the wire?. Cut it in half and check again to verify 

I always was kind of tall for my height.

Resistance does go higher with length of carbon coil wire. Not a problem with a sold core wire.