spark plug recommendations
#1
Rennlist Member
Thread Starter
spark plug recommendations
I did a couple of searches looking for previous discussions on spark plug recommendations but did not see a list by brand type recommendation.
Any recommendations on plugs and wires for a 1979 928 4.5L CIS?
Thanks
Jim
Any recommendations on plugs and wires for a 1979 928 4.5L CIS?
Thanks
Jim
#2
Supercharged
Rennlist Member
Rennlist Member
Join Date: May 2002
Location: Back in Michigan - Full time!
Posts: 18,925
Likes: 0
Received 59 Likes
on
33 Posts
As for plugs, these car seem to respond best to the good 'ol copper Bosch plugs.
If you look at the Owner's Manul (available by link in my signature) you will see they recommend the W8. Today's version of that would probably be the WR8DC.
If not available, I would recommend the NGK's. I believe the equivalent is BP5ES.
If you look at the Owner's Manul (available by link in my signature) you will see they recommend the W8. Today's version of that would probably be the WR8DC.
If not available, I would recommend the NGK's. I believe the equivalent is BP5ES.
#3
Addict
Rennlist Member
Rennlist Member
Another vote for Bosch coppers. Available from any of the 928 suppliers and probably at the autoparts store.
#4
Rennlist Member
I've had Bosch platnum +4's in for about 10 years (25k miles) and have been very happy with them, but I think some folks don't like them, not sure why. I need to change to PorKen's recommended cooler Bosch copper plugs soon since I installed his chips.
#5
Drifting
These are extras since I ended up going one range colder for the SC install.
You can have these for $15.00 plus shipping if you want.
They have never been out of the box.
You can have these for $15.00 plus shipping if you want.
They have never been out of the box.
Trending Topics
#8
Administrator - "Tyson"
Lifetime Rennlist
Member
Lifetime Rennlist
Member
From a performance standpoint you cannot beat copper. In a stock car I doubt you can tell much difference, so why spend the extra money?
The multi-point electrodes are for longevity, nothing else. They are very hard to properly gap which is why I stay away from them.
Late model VW engines are very picky. My friends VW Beetle (non-turbo) had a nasty miss-fire. Swapping out the Bosch Iridium plugs installed, for copper and the problem went away. I've seen the same thing with a few 1.8 Turbo Audi / VW's as well.
The multi-point electrodes are for longevity, nothing else. They are very hard to properly gap which is why I stay away from them.
Late model VW engines are very picky. My friends VW Beetle (non-turbo) had a nasty miss-fire. Swapping out the Bosch Iridium plugs installed, for copper and the problem went away. I've seen the same thing with a few 1.8 Turbo Audi / VW's as well.
#9
Nordschleife Master
#12
My car must be the odd one out, as I tried +4 many years ago, and the car rana little rough. I don't know what role having AutoThority chips plays in the equation. Switching to single electrode Bosch platinums resolved the issue.
For what it's worth, right now I'm running NGK iridiums, and the old girl seems to like those the best from what I have tried thus far. Starts up smoothly and voltage is higher on dash compared to platinum plugs. I change the plugs regularly and my mileage is low, so wear shouldn't have been a factor.
For what it's worth, right now I'm running NGK iridiums, and the old girl seems to like those the best from what I have tried thus far. Starts up smoothly and voltage is higher on dash compared to platinum plugs. I change the plugs regularly and my mileage is low, so wear shouldn't have been a factor.
#13
Drifting
Wow… and here I thought spark plugs were spark plugs (except for heat range). Yeah, some last longer than others, but they usually cost significantly more.
I thought all the hype about multi electrodes got debunked years ago. Sounds like the plug debate is about as heated as the oil debate. Does running Amsoil decrees the life expectancy of platinum?
I thought all the hype about multi electrodes got debunked years ago. Sounds like the plug debate is about as heated as the oil debate. Does running Amsoil decrees the life expectancy of platinum?
#14
Administrator - "Tyson"
Lifetime Rennlist
Member
Lifetime Rennlist
Member
#15
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
I only recommend what Porsche originally installed for stock cars.
WR8DC+ 78 to 82
WR7DC+ 83 to 91
WR7DTC 92 to 95
WR8DC+ 78 to 82
WR7DC+ 83 to 91
WR7DTC 92 to 95
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."