Printable Version of Topic

Posted by: krazykonrad Jan 18 2017, 08:03 AM

If I remember correctly, the Cap'n recommended the basic copper-core single-prong spark plugs for our 914s. Any other advice out there?

Also, since we're here, how about for modern engines? Are the super 4-prong iridium fusion-reactor plugs worth it?

Thanks,
Konrad

Posted by: mepstein Jan 18 2017, 08:29 AM

Yes, copper for 914's and air cooled 911's.
Modern engines, I have no idea, I imagine follow manufacture recommendations.

Posted by: Frankvw Jan 18 2017, 08:59 AM

for the 914 try to find bosch w7cc. over here the W7 are hard to find, they will try to sell W8 ones instead. Of course there are several NGK options if you do not want to go for a Bosch plug.

Posted by: John Jentz Jan 18 2017, 10:05 AM

IIRC, the Cap'n recommended NGK B6ES or Bosch W7CC.

Posted by: jd74914 Jan 18 2017, 10:25 AM

Provided it's stock, I'd go with whatever the OEM recommends since they do spend a ton of money on plug selection. Modern engines are pretty well integrated systems.

914 stuff is like noted above. Copper for the win.

Posted by: Chris914n6 Jan 18 2017, 11:02 AM

Buy the plugs spec'd during production. If it was ACDelco iridiums then buy those and not the cheaper crap.
The 4 prong are usually spec'd for high pressure direct injection turbo motors.

Posted by: Mark Henry Jan 18 2017, 11:35 AM

Copper or solid core only, for some reason aircooleds, both /4 and /6, don't like fancy plugs.

Also Bosch and NGK have rolled threads, plugs like champion have straight cut threads and are more prone to stripping the threads out of the head.

Posted by: krazykonrad Jan 18 2017, 12:18 PM

Now that's useful information! I remember back in school watching about half the threads vanish into the combustion chamber of my old Nissan 200SX the first time I changed the plugs.