Engine OEM Spark Plug Gap

[Fustin]

I ordered some OEM spark plugs (SILZKR8H9G) direct from Hyundai to install but I am trying to verify the correct gap. I have access to the technician service manual and it states two different ranges.

It lists .0315" - .0354" in the specifications section and then below that in the installation steps it lists .0275" - .0314" (see pictures below). I checked the gaps of the ones I ordered and they are all right around .033". I know my 2019 Veloster N used different OEM plugs (SILZKR8E8G) which had a gap range of .0275" - .0314" so I am wondering if they just forgot to update the installation section for the Kona N and it actually should have a larger gap?

 

[Nyaruto.N]

I ordered some OEM spark plugs (SILZKR8H9G) direct from Hyundai to install but I am trying to verify the correct gap. I have access to the technician service manual and it states two different ranges.

It lists .0315" - .0354" in the specifications section and then below that in the installation steps it lists .0275" - .0314" (see pictures below). I checked the gaps of the ones I ordered and they are all right around .033". I know my 2019 Veloster N used different OEM plugs (SILZKR8E8G) which had a gap range of .0275" - .0314" so I am wondering if they just forgot to update the installation section for the Kona N and it actually should have a larger gap?
View attachment 26484

View attachment 26485

It looks like most people have theirs gapped at around .030 or down to .027 if they are tuned and running OEM plugs. My SILZKR8H9G plugs came gapped at around .038 from factory so I brought them to .029 going to install them soon

 

[i_twenty_N]

Higher gap, bigger spark more ignition power needed. Only a gap needed that suits the recommendation. On big boost sparks getting weaker, therefore they must be bigger! To ensure correct combustion, then often stronger coils are needed to get everything balanced.