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 |
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. |
Another vote for Bosch coppers. Available from any of the 928 suppliers and probably at the autoparts store.
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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.
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2 Attachment(s)
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. Attachment 444333 Attachment 444334 |
My car seems to like the newer multi-electrode Bosch Iridium jobs ...
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$0.90 Motorcrafts seem to work fine to me.
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Originally Posted by Don Carter
(Post 7590179)
but I think some folks don't like them, not sure why.
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. |
Originally Posted by Hacker-Pschorr
(Post 7590241)
From a performance standpoint you cannot beat copper.
I'll do that every time I need to really get into the engine so roughly every other week. (humor) |
Anyone running Bosch silver (W7DSR)?
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Originally Posted by Paul Gotter
(Post 7590368)
Anyone running Bosch silver (W7DSR)?
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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. |
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? |
Originally Posted by auzivision
(Post 7590495)
I thought all the hype about multi electrodes got debunked years ago.
Some people also go 10,000+ miles between oil changes. ;) |
I only recommend what Porsche originally installed for stock cars.
WR8DC+ 78 to 82 WR7DC+ 83 to 91 WR7DTC 92 to 95 |
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