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Blas · Joined: 05 Nov 2002 Posts: 227 Location: Illinois, USA

Doing a little tune-up work and I found a set of Bosh Platinums and a set of Splitfires in my parts boxes. Any pros or cons with either brand? What would be the proper gap for each set? The Bosch says .028 on the box the Splitfires say nothing. My 924 maunal says .024 for regular Bosh or Champion plugs....
As usual, thanks everyone....

Diesel · Joined: 03 Nov 2002 Posts: 1061 Location: Ellington,CT

Those 2 plugs are the absolute worst choices. Go for the regular Bosch plugs, they are more than adequate.
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Dan Flanagan--2002 VW Jetta TDI, 83 Mercedes 300D,83 Mercedes Euro-240D

Blas · Joined: 05 Nov 2002 Posts: 227 Location: Illinois, USA

Can you expound on those comments a bit please?
Thanks

D Hook · Joined: 02 Nov 2002 Posts: 3158 Location: Omaha, NE

I tried the splitfires when they first came out. Didn't notice any difference.

Since then, they've been forced to back off some of their claims about improved gas mileage and performance. Also have been stories about one of the nodes breaking off and ruining the side of the cylinder walls and how the spark has a tendency to jump only to the same node after awhile, making them just an expensive single node plug.

Most information I've read about them says they're not worth the extra money. But it's your money.

I've used champions before but not in my 924. No complaints.

Why not go with the Bosch platinums?
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'80 924 n/a SOLD

endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana

I have to agree with Diesel. I have had nothing but problems with the Bosch Platinum plugs. I have tried them several times in a variety of customers cars and I hate them!! They missfire, don't fire or just idle like crap. The splitfires don't seem to be any better than standard plugs. They just don't live up to the hype. I'd run them before the Platinums though. If you want a good long lasting workhorse of a plug, go with the standard Bosche plug. If you want a little more refined better idleing but short lved plug, go with standard NGK's. JMTC

Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey

Diesel · Joined: 03 Nov 2002 Posts: 1061 Location: Ellington,CT

It's common knowledge among professional mechanics that Bosch Platinums misfire. They should be banned by the EPA they destroy so many catalytic converters. As far as Splitfires, when they first came out I saw one spit the porcelain portion right out of the head, leaving the threaded part in place. Some quality there.
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Dan Flanagan--2002 VW Jetta TDI, 83 Mercedes 300D,83 Mercedes Euro-240D

Paul · Posted: Mon Sep 11, 2006 10:41 am Post subject:

I use Autolite plugs in my 931 after trying many others. My second choice is Champions.

I too tried the plats, my 931 would not even idle.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

koolkarateguy · Posted: Mon Sep 11, 2006 11:25 am Post subject:

I put NGK Silver in mine back in March, they've worked very well and are still pretty clean.
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1979 N/A 924

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

I used to use NGK's until I changed them out on my wifes SUV. All of them had been leaking between the metal and ceramic. Now I'm back to Autolite and Champion.

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

moone924 · Joined: 05 Feb 2003 Posts: 868 Location: Douglas Wyoming

I use the Bosch W7DTC Tri-Electrode (copper) on my 924 and Audis.
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Ryan Moone

Always shopping for a nice s2 931 to baby.
New philosophy : one car project at a time.

Chrenan · Joined: 15 Jan 2003 Posts: 3903 Location: Canada

Based on this topic I swapped out my Bosch platinums for a set of Champion coppers today. It does seem smoother with the coppers, might be psychological, or maybe the Bosch platinums really do misfire, I had never heard of this problem before.
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1987 951 - M193 Version for Japan

Stampedetrail · Joined: 29 May 2005 Posts: 274 Location: Fairbanks, Alaska

Slightly hotter than stock NGKs is what I've been running, because of all the sloppy oil control. They burn that stuff right up. Starts better cold with them than with stock Bosch or Autolite plugs.
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1977.5 924 "Martini" head / New Old Stock rebuild
1985.5 944 Why? Because I can.

Blas · Joined: 05 Nov 2002 Posts: 227 Location: Illinois, USA

I had BOSCH WR7DP plugs on the car and I swapped them out to NGK #BP7ES... apperars to idle smoother now.

Lizard · Posted: Wed Sep 20, 2006 3:38 am Post subject:

I ran platniums in the 78 I had and it ran ok for 2 months then got high speed glazing on it and wouldnt run at all,
I have tried the NGK Iridium ones they lasted abit longer, but the hottest spark I coud ever get was from bosch coppers.
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3 928s,