Which spark plugs for the frankenmotor?

[franklinstower]

I would think going one colder on the heat range for a frankenmotor (ej25 ph1 block/EJ22 heads) would be beneficial by possibly reducing knock and therefore keep the ecu from pulling timing.

 

I am basing this simply on the increased compression creates more combustion chamber heat and therefore a greater chance of pre-ignition from the longer Spark Plug insulator. Also more heat from the increased load due to this engine is going into my Westy.

 

I can't find where this has been discussed. Any thoughts or input into that notion?

 

Paul

[cal_look_zero]

I ran a set of BKR7E-11 plugs for a week and didn't notice any difference in terms of pulling timing or not. I'm going to try them again when I get tuned and see if they make any difference.