DerSchlechtSpecht

Hey guys, today I asked my wrench what his take on the Bosch platinum 4 plugs in my 944. He told me that they are absolute garbage. I herd many good things about these plugs. What do you guys think?

(My wrench also hates my Bursch exhaust)grrrrr

Christian

Luke

BAD on turbo cars. I hear bad stuff bout' Bosch in general too.

Perry 951

Over priced, over rated, and sometimes they can cause running issues in 944's. Stick with the good old copper and replace every 30,000 with the belts.

Luke

I hear good things about NGK's . I picked up a set.

JGriff

I recently had the Cam Chain Tensioner done on my S2, and I told the tech, while he was "in the area", to take a look at the plugs, and to put new ones in if need be.

When he took them out, he found that they were triple electrode plugs (which I think were NGKs... because Bosch doesn't make triples... only singles, doubles and quadruples).

He told me that the multi-electrode plugs weren't recommended to put in these cars (well, at least the S2... I don't know about the Turbo or 8-valve models). He also stated that the ones in there were the wrong heat range. He installed the "correct" ones... Bosch WR5DC.

FWIW, I have noticed that the car runs better and smoother.

Hope that helps.

Jim

dualblade

the advice that i have heard from a very well educated mech is that the platinum +4 plugs are really bad but the regular platinum (wr5dp in the s2) is fine

PorscheG96

Definitely over-priced and over-rated. NGK rules.

Dave H.

Bosch does make triples. W8DTC. VW started using them around 87.

just to stay on topic - i run the quad's in my car. seems to run ok, but i may switch to triple copper cores. i've never liked platinum plugs. other cars have had fouling problems with them...

NGK - No Good Kind.

[quote]Originally posted by JGriff:
<strong>
When he took them out, he found that they were triple electrode plugs (which I think were NGKs... because Bosch doesn't make triples... only singles, doubles and quadruples).

Jim
</strong><hr></blockquote>

AndyK

The P/O put +4's in my car, and when I changed to the standard Platinum plugs, the car was much smoother. End of story!

zucker

This is a comment directed towards the negative comment towards Bosch.
What company do you think made every other engine management component on your car? Bosch is one of the world's largest and most respected automotive suppliers in the world. The 968 originally came with WR7 DTC triple electrode BOSCH plugs. Replacing them with the quad electrode will do nothing but increase the life of the plug. You dont get something for nothing and all the additional electrodes provide is increased plug life. This type of plug is common practice in aviation and given the increasing restrictions for longer vehicle service intervals the plugs must live longer and this is a simple and effective solution. Had your 968 been built within the last couple of years there is a good chance it would use these plugs.

Luke

[quote]Originally posted by zucker:
<strong>This is a comment directed towards the negative comment towards Bosch.
What company do you think made every other engine management component on your car? </strong><hr></blockquote>


I hear bad things about Bosch plat. plugs for turbo cars and I hear that their O2 sensors aren't so hot. What does that have to do with their engine mang. ,ESP or windshield wiper blades???

I didn't mean to strike a bad chord with anyone

I actually like Bosch though. I applied for a co op position with them a week or two ago.

*Bad - as in not the best for our application

Tremelune

NGK is the way to go for plugs. For everything that combusts.

Luke

[quote]Originally posted by Tremelune:
<strong>NGK is the way to go for plugs. For everything that combusts.</strong><hr></blockquote>


I like NGK

<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

Danno

I think the Bosch platinum plugs got a bad rap early on because the center electrode would become dislodged somehow from the surrounding ceramic insulator and fall out. It would then be stopped by the ground electrode and you'd have a shorted out plug.

Haven't heard anything since then on whether they fixed the runwaway electrode problem. But with the 3/4-way plugs, there's no electrode that covers the center, so if that little piece of platinum was to escape, it'd definitely would do bad things to your engine.

However, I think the performance differences with spark-plugs are irrelevant. I think what people notice even more is the difference between old, worn-out, and corroded plugs vs. the new ones they installed. In this case, there will definitely be a benefit regardless of brand or model.

I think much better ignition improvements can be had by installing a multi-spark unit, like the MSD-6A.

IceShark

[quote]Originally posted by zucker:
<strong>This is a comment directed towards the negative comment towards Bosch.

snip blather

Replacing them with the quad electrode will do nothing but increase the life of the plug. You dont get something for nothing and all the additional electrodes provide is increased plug life. This type of plug is common practice in aviation and given the increasing restrictions for longer vehicle service intervals the plugs must live longer and this is a simple and effective solution. Had your 968 been built within the last couple of years there is a good chance it would use these plugs.</strong><hr></blockquote>


Mind proving this? Outside of long (which platinum does admirably since it is so tough, but not so good on the conductor scale) and poor service? I'm aware avaition has run with dual plugs, that is two plugs per cylinder and seperate electricals, since about day one. So almost 100 years ... you know anyone alive that knew the time when planes first started flying? I do/did. It is a lot futher to ground and steady state in those air critters. <img src="graemlins/xyxwave.gif" border="0" alt="[bigbye]" />