Sparkplugs and LPG

[perhss70]

I want to replace the plugs on my 1997 2.0T S70 (B5204T3). It has an lpg conversion. Should I go with OEM plugs or are there any alternatives. I got some OEM plugs for an s60. Is the gap different? Thanks in advance

[misha]

Check for part #.
Turbo & na use different oe spark plugs.
You can't go wrong with oe Volvo(set of five) spark plugs for turbo engines.

[wahiddd]

Safest bet is to go with OEM spark plugs, but as misha said above me, just check the part number and see if they're compatible

[hiroku]

You should use one heat range colder plugs with LPG. From my experience, OEM heat range plugs showed clear signs of running too hot.

[perhss70]

Volvo # is 30637308. After contacting ngk they said that the corresponding plugs are ngk 3500.
What plugs should I use if I want to go for cooler plugs?

[hiroku]

That's a PFR6B plug. The 6 in the NGK reference indicates the heat range. The colder plug will be a 7 heat range, which according to the cross-compatibility charts is comparable with Denso 22 or Bosch 5, for example. That is consistent with my experience.

Check the NGK catalogue and look for a compatible plug to the 3500, but with a heat range of 7. I'm not sure they will have one, but it's worth a shot.

I had the same issue finding compatible colder plugs for my LPG-converted T-5. I ended up going with Denso Iridiums (reference IK22), and while the performance was great, their durability was abysmal. LPG is notoriously more demanding of ignition systems, so I chalked that up to normal maintenance and accepted that trade-off. IMO that's better than overheating OEM plugs.

I don't have the LPG car anymore, but my next step would be to try the Denso twin-tip range (IK22TT). It promises much better longevity, so could be worth a shot.

[perhss70]

That's a PFR6B plug. The 6 in the NGK reference indicates the heat range. The colder plug will be a 7 heat range, which according to the cross-compatibility charts is comparable with Denso 22 or Bosch 5, for example. That is consistent with my experience.

Check the NGK catalogue and look for a compatible plug to the 3500, but with a heat range of 7. I'm not sure they will have one, but it's worth a shot.

I had the same issue finding compatible colder plugs for my LPG-converted T-5. I ended up going with Denso Iridiums (reference IK22), and while the performance was great, their durability was abysmal. LPG is notoriously more demanding of ignition systems, so I chalked that up to normal maintenance and accepted that trade-off. IMO that's better than overheating OEM plugs.

I don't have the LPG car anymore, but my next step would be to try the Denso twin-tip range (IK22TT). It promises much better longevity, so could be worth a shot.

Does the spark plug position matter a lot? Ngk 3500 is 3.5mm and Bosch FR5KI332S I found in a local store is 4mm

[Goupil]

Not using LPG, but I run NGK BKR7E on my E85 tuned B5254T per tuner recommandations.
They're 7 heat range, nothing fancy but only around 4€/$ a piece. I gap them at the very lowest of the recommended range (granted I dont run stock boost)

[hiroku]

Does the spark plug position matter a lot? Ngk 3500 is 3.5mm and Bosch FR5KI332S I found in a local store is 4mm

I wouldn't think so, that seems like a compatible plug.

[perhss70]

Not using LPG, but I run NGK BKR7E on my E85 tuned B5254T per tuner recommandations.
They're 7 heat range, nothing fancy but only around 4€/$ a piece. I gap them at the very lowest of the recommended range (granted I dont run stock boost)

Can I go from iridium plugs to plain nickel?
I have heard that it's not recommended but I don't know for these specific engines