AussieRCBasher said:wot truck or engine is it?? cos a os 8 is way too hot for a savage
husky said:if os8 is not suitable for 21+ engines then i think 99% of us are using the wrong plug
tchinghar said:im with AussieRCBasher on this one. he knows whats up alright.
bigger engines prefer cooler plugs
higher nitro percentage fuels prefer cooler plugs
high compression engines prefer cooler plugs
now considering most people here use large displacement, high compression engines, and run ~20% nitro, id say that being one of OS's hotter plugsthe #8 is too hot. the A5 is a good choice.thats what i run
just my opinion