Quote:
Originally Posted by ever_green
that's strange on days that i use grille block my timings usually advance furthest and overall MPG improves. sometimes if i don't use a grille block my timing would not hit 44-46 deg the whole day...not sure why.
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because you've changed the conditions.
with a grille block in place, the engine is under less load since there is less aerodynamic drag to fight against. an engine at the same RPM, but with lower load can GENERALLY get away with running more advance without running into knock.