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Garage => Mechanicals => Topic started by: daantjie on 16 May 2022, 05:23 PM

Title: Plug wire quality
Post by: daantjie on 16 May 2022, 05:23 PM
Hi guys

Any feeling on what are "the best" aftermarket wires?  I run Karlyn and they seem fine, but many folks on the various boards slam them pretty hard.

Beru seems to be the one with the most favourable feedback.  Any thoughts on them?

Then further there is the whole resistance dabate, 1k ohm vs 5k ohm...

Cheers
Title: Re: Plug wire quality
Post by: goldacre on 17 May 2022, 04:41 AM
Hi Daantjie, going back to around 2008 but I replaced my leads on the 450 with Karlyn and was not happy with them the car ran not quite right, so swapped them over for a set of Beru and never looked back the difference was very noticeable in smoothness,go with Beru. That ohms thing I cannot recall what the manual says but Beru had a set to suit, think the ohms is stamped on the metal plug cup? Will check mine but thinking its not much, 1 ohms?
Title: Re: Plug wire quality
Post by: SteveDuNord on 17 May 2022, 05:36 AM
Does it matter if you mix plugs, rotor and cap brands?

I have a bosch cap and rotor on order, and can get the Beru and Bosch leads for the same price.
Title: Re: Plug wire quality
Post by: daantjie on 17 May 2022, 09:36 AM
Thanks, indeed I think Beru is the go to.  However with quality generally going tits up across the board who knows if there really is much difference nowadays.
My set has the 5k ohm connectors as well.
Title: Re: Plug wire quality
Post by: UTn_boy on 17 May 2022, 07:24 PM
I put a set of Beru on y 4.5 a few years ago.  Within a year every one of the resistors in the connector (on the sparking plug) burned up and went open causing a miss. I currently only buy plug wires from Mercedes or Bremi-STI.  Yes, the Mercedes wires are expensive....welcome to vintage Mercedes ownership.  Bosch and Beru parts are bottom of the barrel now.....they're now considered "URO" brand territory by the majority of shops and people that do their own work. 
Title: Re: Plug wire quality
Post by: daantjie on 17 May 2022, 08:11 PM
Quote from: UTn_boy on 17 May 2022, 07:24 PMI put a set of Beru on y 4.5 a few years ago.  Within a year every one of the resistors in the connector (on the sparking plug) burned up and went open causing a miss. I currently only buy plug wires from Mercedes or Bremi-STI.  Yes, the Mercedes wires are expensive....welcome to vintage Mercedes ownership.  Bosch and Beru parts are bottom of the barrel now.....they're now considered "URO" brand territory by the majority of shops and people that do their own work. 

Interesting...so how about Karlyn-STI, is this the same as Bremi-STI?
Title: Re: Plug wire quality
Post by: goldacre on 18 May 2022, 08:04 AM
Hi SteveDuNord, no, mix and match is the go these days. I have a Bosch cap and coil made in Mexico, a Bosch rotor from Israel from memory, Beru leads made in Germany and NGK BP5ES spark plugs made in Japan.  No problem.

Sad to hear Beru has given people problems, mine are 14 years old and going good but that was a while ago, wonder if they outsourced?  :(

My issue is finding damn spark plugs with removable screw off terminals, still can't get a straight answer from NGK if their leads can fit normal plugs (fixed terminals)  >:(

Title: Re: Plug wire quality
Post by: SteveDuNord on 18 May 2022, 12:22 PM
Quote from: goldacre on 18 May 2022, 08:04 AMHi SteveDuNord, no, mix and match is the go these days. I have a Bosch cap and coil made in Mexico, a Bosch rotor from Israel from memory, Beru leads made in Germany and NGK BP5ES spark plugs made in Japan.  No problem.

Sad to hear Beru has given people problems, mine are 14 years old and going good but that was a while ago, wonder if they outsourced?  :(

My issue is finding damn spark plugs with removable screw off terminals, still can't get a straight answer from NGK if their leads can fit normal plugs (fixed terminals)  >:(



Oh damn. I just fit their 6es and they had removable terminals. Thought I'd bought the wrong ones at first.

Long shot but are they definitely fixed? I had to use pliers to screw my caps off.
Title: Re: Plug wire quality
Post by: johnnyw116 on 18 May 2022, 01:00 PM
I have Beru leads cap and rotor they are now for 10 years on my car without problems , the cap and rotor i checked a few months ago during maintenance there was no need to replace them , for some years now i use Bosch super 4 WR78 sparkplugs also without complaints
Title: Re: Plug wire quality
Post by: goldacre on 19 May 2022, 08:21 AM
Hi SteveDuNord, no probs with 6es plugs, I bought heaps of them around 10 years ago with screw off terminals when it was reported that NGK were not making them anymore  :(

But after some research they say people with the low compression 'enviro friendly' engine like I have, A non Federal Californian low emissions engine they fitted to Australian cars to meet ADR requirements which required more fuel use to compensate for less performance  ::) go figure.. you should run a hotter plug like W9DC but my choice is the 5es from NGK (their heat range is lower number is hotter, Bosch other way).

You can't use fingers to unscrew the terminals,  definitely need mechanical assistance:)

Some people say running resistance plugs is OK, some say it doesn't work, causes rough running? But if it's working go for it  8)





Title: Re: Plug wire quality
Post by: UTn_boy on 19 May 2022, 10:10 AM
Non resistor Bosch plugs are still available new from Mercedes for all of the W116 engine variants.  Though, the last time I ordered a set of plugs from Mercedes for a 6.9 they sent BERU plugs.....but they were old stock and worked just fine. 

I'd imagine Karlyn-STI would be ok.....but I've never seen or used that brand. So I can't say with any conviction that they ok to use.  But with STI being involved they are probably ok. 
Title: Re: Plug wire quality
Post by: SteveDuNord on 21 May 2022, 07:25 AM
On a related note, I received a Bosch distributor cap today that is listed everywhere as being compatible with a 280se. It's actually for a four pot vehicle. Dunno why so many places have it listed incorrectly.

Part no. 1 235 522 327

(https://i.postimg.cc/26FxX7mY/bosch-Dizzy-Wrong.jpg)

 >:(
Title: Re: Plug wire quality
Post by: ptashek on 21 May 2022, 12:14 PM
I've had Beru leads in Goldie since the resto, 6+ years and about 17k miles by now, and a good few long distance trips. I also have Beru leads in the 280TE, with at least 70k miles on them, and Beru coil packs and plugs with about 10k done on those. Also plenty of long distance trips.

Not a single issue with either.

Unless the Beru stuff you get in the US is not the same Beru stuff we get in Europe, I'd say their products are OK based on my own limited, yet practical experience.
Title: Re: Plug wire quality
Post by: daantjie on 21 May 2022, 01:13 PM
I think Beru got bought out by Federal Mogul so use that as you wish.  But then again most parts houses have been rolled up into big brother corps by now commensurate with quality taking a dive.
But that's what happens when engineers don't run the show anymore and the bean counters take over...
Title: Re: Plug wire quality
Post by: SteveDuNord on 07 June 2022, 06:26 PM
The Bosch leads I bought 0 986 356 336 don't fit my Bremi distributor cap.

I thought the different brands were interchangeable?

I swear if I've bought yet another wrong part....
Title: Re: Plug wire quality
Post by: daantjie on 07 June 2022, 06:36 PM
Quote from: SteveDuNord on 07 June 2022, 06:26 PMThe Bosch leads I bought 0 986 356 336 don't fit my Bremi distributor cap.

I thought the different brands were interchangeable?

I swear if I've bought yet another wrong part....

Maybe post pics of what you have in hand.  From memory the Bosch cap has shorter posts than the Beru style cap and you need to match the connector on the wire to the one on the cap.
Title: Re: Plug wire quality
Post by: SteveDuNord on 07 June 2022, 06:38 PM
Quote from: daantjie on 07 June 2022, 06:36 PM
Quote from: SteveDuNord on 07 June 2022, 06:26 PMThe Bosch leads I bought 0 986 356 336 don't fit my Bremi distributor cap.

I thought the different brands were interchangeable?

I swear if I've bought yet another wrong part....

Maybe post pics of what you have in hand.  From memory the Bosch cap has shorter posts than the Beru style cap and you need to match the connector on the wire to the one on the cap.

Oh good. I intend to change the Bremi cap for a Bosch one when they are back in stock. The new leads can stay in their box until then.
Title: Re: Plug wire quality
Post by: johnnyw116 on 08 June 2022, 04:56 AM
Quote from: SteveDuNord on 07 June 2022, 06:26 PMThe Bosch leads I bought 0 986 356 336 don't fit my Bremi distributor cap.

I thought the different brands were interchangeable?

I swear if I've bought yet another wrong part....


i think that they gave you an later model distrubitor cap for an W126 280S/SE

This one is for an W126

and the second pic is for an W116
Title: Re: Plug wire quality
Post by: Neil4speed on 09 June 2022, 01:20 PM
For what is worth - I replaced with NKG with a Bosch Cap and it has been good so far!