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Which Copper Plugs

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

ferocity02
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Which Copper Plugs

Post by ferocity02 » Mon Jan 13, 2020 6:01 pm

Which exact (PN# please) copper plugs are recommend for a turbo 1998 S70? I see everyone recommending OEM plugs or copper plugs, but I haven't see anyone call out a specific part number for the copper plugs.

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abscate
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Re: Which Copper Plugs

Post by abscate » Mon Jan 13, 2020 6:52 pm

Every outlet uses different part numbers but I would go to anyone of our supporting vendors and use Their parts finder to source a set of either Volvo or Bosch single electrode spark plugs ( turbo) for your model and year

They will cost about $3 each from Bosch
This is a set of 5 OE Bosch FR7DPP (30637308) Spark Plugs, made in the same factory as Volvo 8692071
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Re: Which Copper Plugs

Post by ferocity02 » Tue Jan 14, 2020 1:06 pm

Spark plug mfg's tend to have multiple plugs that are compatible with any one vehicle. And sometimes the best plugs for the vehicle are not what's recommended by the mfg.

I am looking for the PN for the copper plugs that are commonly recommended on these and other Volvo forums. I believe that Bosch is the preferred mfg of copper plugs for our cars.

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erikv11
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Re: Which Copper Plugs

Post by erikv11 » Tue Jan 14, 2020 8:03 pm

Bosch copper FR7DC
Bosch platinum FR7DPP
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 285k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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Re: Which Copper Plugs

Post by ferocity02 » Tue Jan 14, 2020 11:53 pm

Thanks! I just ordered a set of the FR7DPP plugs. These also can be found with Bosch PN 7955.

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Re: Which Copper Plugs

Post by misha » Wed Jan 15, 2020 1:06 am

erikv11 wrote: ↑
Tue Jan 14, 2020 8:03 pm
Bosch copper FR7DC
Bosch platinum FR7DPP
Do they need to be re-gapped?
I know that Volvo ones in a set of 5 are properly gapped.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
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'71 144 S
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'78 244 DL
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Re: Which Copper Plugs

Post by Cookeh » Wed Jan 15, 2020 3:38 am

misha wrote: ↑
Wed Jan 15, 2020 1:06 am
erikv11 wrote: ↑
Tue Jan 14, 2020 8:03 pm
Bosch copper FR7DC
Bosch platinum FR7DPP
Do they need to be re-gapped?
I know that Volvo ones in a set of 5 are properly gapped.
The FR7DPPs I bought were gapped correctly, as were three friends sets. The Volvo ones I bought were not (and had two broken plugs in the packet, so might be down to handling).

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Re: Which Copper Plugs

Post by 850 LPT » Wed Jan 15, 2020 6:00 am

Agreed, I think re gapping is a thing of the past. Unless the packaging is damaged and one might suspect bent prongs.
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Re: Which Copper Plugs

Post by abscate » Wed Jan 15, 2020 7:59 am

I think they come at 0.75mm ().030" for Yemen) and people do report they run better at 0.70mm

On my turbo car, I gap new plugs at 0.70mm and run them 25k, then replace. I have found regapping needed at 15000 miles
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Re: Which Copper Plugs

Post by Cookeh » Wed Jan 15, 2020 8:01 am

abscate wrote: ↑
Wed Jan 15, 2020 7:59 am
I think they come at 0.75mm ().030" for Yemen) and people do report they run better at 0.70mm

On my turbo car, I gap new plugs at 0.70mm and run them 25k, then replace. I have found regapping needed at 15000 miles
The three sets I can account for were gapped to 0.7mm, if we're talking about the FR7DPPs. Of course that is a tiny sample size.

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