indefactorX

well kinda curious what spark plugs you guys get the best results from
Or what you prefer to stick with?

autochicago

I believe Bosch W7DC in the early cars. Could be W8's. Copper plugs. As nifty as they sound, the chain store Bosch platinums are really quite junk. I've seen a number of bad plugs right out of the box. The real $10+ ea. platinums may be applicable, but don't think there's any justification for a stock motor.

Mark

Good old Bosch Super's. About $2 apiece

I JUST bought new one's - the old one's had were in the car when I got it 18+ months ago. I changed the 1st 2 and decided it wasn't worth the effort at this time....they looked almost NEW!

My wrench STRONGLY discouages the use of the multi electrode plugs - made by ANYONE.

He showed me a 928 engine that was severely messed up when one of the electrodes dropped down into the cylinder!

autochicago

P.S. and by all means, stay away from any brand like Champion, Motorcraft, Autolite, or A.C. Delco. Again, similar experiences on the dyno and in cars in for service. Dead miss cylinders on plugs brand new out of the box. And, for example, Motorcraft (at least as of about 6 years ago) are known to leak past the insulator ("burnby" I believe is the correct term). The Japanese plugs always seem really good, but out of practice I don't know anyone that regularly puts them in German cars.

[Interesting sidenote and disclaimer: I once got bawled out at a job I worked in college for whiting out a Motorcraft parts box and modifying it to read "Motorcrap". Maybe today's Motorcraft stuff is better as Ford's (and domestic, in general) standards have improved since then. And any persons of Irish descent might appreciate the term "Auto****e".]

So, yes, in short, Bosch Super is the way to go, (of course, with a small dab of antiseize paste on the threads and torqued to the proper spec.)

indefactorX

what's the spark gap for a 79 928?

autochicago

I know it, but this is a game. In the sidebar, find the search function and search the 928 forum on "plug gap" or I do believe 928 Specialists posts it. It will also be in the Bosch catalog at any parts store.

indefactorX

Thnx auto ^_^ Btw, you have a PM

Jack '84 928s

Bosch Copper from autozone!

Mark

The Bosch Super's come pre-gapped...

fst951

Hi.

Some of the Motorcraft plugs are fantastic for racing application where heat range adjustment is important. I also like NGK and some of the Denso plugs.

Thanks

GlenL

I use the Bosch single-electrode platinum plugs in W7 spec. (Gotta ask for S4 plugs, they don't know part numbers.) While these were identified as "crap" by a previous poster they work well for me. Cheap at the local parts store. Cheap enough to put in a new set each year. Engine runs very smooth with never a hint of mis-fire. What else do you want?

Garth S

If you want a plug that seems to last forever, get the silver electrode Bosch WR8DS and gap at 0.7mm (0.028", up to ).030") - for the 16v NA spec. (W7DRS for the 32v cars).

Steve J.

Bosch copper in the '78, platinum in the '87. BTW - Is there any advantage in indexing the single electrode plugs so the gaps face the combustion chamber?

John..

Bosch W5DC....no resistance and a few heat ranges colder!

Jeff McVicar

NGK'S never had a bad one............................AUTOLIGHTS ARE WITHOUT A DOUBT...DEFINITELY THE SHODDIEST HIGHEST FAILING PEICES OF $HIT YOU CAN GET!!!!!!!!! avoid them, never put them in anything you care about............ maybe a push mower but the vibration will soon snap the insulator off. ngk's rule