Bosch "double" Iridium/Platinum works fine in the Volvo, they are not picky.
But whatever you get, get pre-gapped.
But whatever you get, get pre-gapped.
It's a gap issue here - the turbo VW EA888.3s can run multiple plugs, but at a 0.04+ gap, it's going to get mifires.Different resistance in the plug or not exact heat range as OEM's
Maybe some manufacturers try to cover too many heat ranges with few part numbers.
Bosch in particular tries to use one plug to cover multiple heat ranges. i/ wont use them unlesss they were OE.
Seen too many weird issues.
Several spark plug manufacturers are more for a “multiple fit” rather than specific fit like AC Delco in General Motors. Seen many problems created using anything other than manufacturers’ specified spark plugs.
Every MOPAR I've ever had or seen came with Champions, so that is what went back in.Its been like that since the 1960's, some how all the different spark plug manufactures for their brand of vehicles/ engines seem to work good in said brand. AC for GM, Autolite for ford, Bosch for German stuff, Champion - aircraft and sometimes other engines, NGK and Denso Japan stuff. Don't know what works ok in Mopar, was it Champion that supplied them?![]()
And most important the characteristics of the insulator materials. That is likely the most secret of any plug manufacture.Different resistance in the plug or not exact heat range as OEM's
Also the larger the gap, the easier to blow-out the spark.The larger the gap (up to a reasonable limit) the stronger the spark. More voltage to jump= hotter spark
I put Autolites in a friend 80's LeBaron (or whatever it was) 4 banger. Wouldn't run right. I asked her to take it to the dealer; I had no idea. They put Champions back in and all was good. I was blown away.Every MOPAR I've ever had or seen came with Champions, so that is what went back in.
Different resistance in the plug or not exact heat range as OEM's
This is most likely the case. I experienced the same issue with different plug brands not working in some vehicles but great in others.And most important the characteristics of the insulator materials. That is likely the most secret of any plug manufacture.
Stating the obvious?Also the larger the gap, the easier to blow-out the spark.
Expanding on you adding more information on spark plug gap. Which I'd imagine you didn't believe was obvious to everyone either.Stating the obvious?
Good response. I was wondering what the heck..........Expanding on you adding more information on spark plug gap. Which I'd imagine you didn't believe was obvious to everyone either.
Back in the 90's. The little Subaru Impreza boxer engines from Japan came with U.S.A. Champions in an odd heatrange (#8)Every MOPAR I've ever had or seen came with Champions, so that is what went back in.
That's a pretty hot plug for an AC motor. That would be the #65 AutoliteIron Harley Sportsters, shovel heads, all evolution 80”, RN12YC Champions. There was also an Autolite plug that ran well, but I don’t remember the number. Anything other than that, I’d get miss under load complaints. I agree, run what the OEM put in it. I put plugs in my Ford Fusion at 90,000mi and they were “copper”. They looked very good for their age. Replaced them with Motorcraft of the same type and my son has 150,000mi on the car. No misfires.