scott863

Has anyone used these on a 16v engine?


2nd owner of an '81 928 Grand Prix White, Auto trans, full leather interior, every option except competition package.

Past Porsches
'74 914
'66'912
'69 911E
'86 944
'87 944

FlyingDog

Bosch Copper Super.

NGK coppers are also good.

Shark Attack

I still use what James Dean used, Champion, you can spend anywhere from 2.25 to 9.00 a plug.. here is an educational link

Champion

heres an other

an education

scott863

Thanks for the input guys.

heinrich

The WRD8 or whatever single-electrode plugs are the best for 2V systems (16V 928's and 8V 944's), and the platinum Plus 4 or other multiple-electrode plugs are best for 4V systems (32V 928's and 16V 944's).

RyanPerrella

heinrich,

who told you +4's are best for 32v? I would imagine they would be better but i have heard many mixed reviews on these plugs. I am not doubting what you are saying and would tend to agree wih you, but care to share your reasoning on why they are better. The factory plugs are a 3 electrode plug , or at least the ones refered to as copper are 3 electrode.

heinrich

Real-world I have owned 16V and 8V 944's and the difference was clear. I found that the 4-prong stuff made pitch black soot and lowered torque. Same has happened with my 928's ... the 16V 928's hate the platinum plus-4's and the 32V 928's love them.

scott863

Heinrich,

I searched for WDR8 on google and didn't find any spark plugs. Are those Bosch?

anonymousagain

yep, WRD8 is a Bosch plug. Platinum +4 quads were stock in GTS, iirc.

hacker-pschorr

Copper is superior when talking about spark plug performance. The downside is copper does not last as long as other materials. The use of milti electrodes & other metals is for longevity, not optimum vehicle performance. If your goal is to change spark plugs every 100,000 miles, then go with a platinum milti electrode plug. Otherwise stick with single electrode copper.

blown 87

I tend to use what the owners manual calls for on stock engines.
I also read a TSB on the 928 that Porsche did not recommend using anti-seize on the plugs, I think I will still use it.

fbarnhill

Hi,
I put a set of the platnum +4's in my old 83s with almost 200k miles on it and it ran so good I didn't even have to think about them till I sold the car at almost 300k. I swear it's true. I fixed many other things on that car but never had to mess with the engine. I tried the same thing in my 79 Euro AT and had to pull them in favor of the copper. Now with hi-test gas, it is just as smoothe as the old one was. I have the platnum +4's on the shelf if anyone needs them

hacker-pschorr

Platnum +4 plugs will work, and who knows how old or due for replacement the old ones were at 200,000 miles. Any new plug is better than a worn out plug. The US 16V motors are such low performance, it probably doesn't make any difference.

cobalt

I believe the +3's were stock on the GTS's. I don't believe Bosch came out with the +4's until late 90's. I have been told the +3 work best and to stay away from the +4's. So far the +3's show to be perfect for the GTS. I tried the +4's on my high compression SC motor and my Dodge 360 Cu in. They did nothing for the SC and screwed up the Dodge big time.

I have not tried them on either the GTS or the 944S2, although I think I might try them on the S2 next time. I was told by many people they are no good for my turbo.

hacker-pschorr

One big issue with multi point plugs is the gap - kinda hard to run a tighter gap with a 3+ plug, something a lot of turbo owner do when running higher than stock boost.