Pulling the lowers off will lower overall engine temps on the highway more than syn, hi flo a/c, free flow exhaust, oil cooler and a fuel tuner combined.
Pulling the lowers off will lower overall engine temps on the highway more than syn, hi flo a/c, free flow exhaust, oil cooler and a fuel tuner combined.
I replaced my heads last year and left the lowers off for the summer. I missed the lowers in the rain and noticed no difference in the engine heat. They'll stay on this year as I get still caught in the rain often enough.
It seems as though the lowers actually funnel the air over the motor somewhat. We need to ask someone with an oil temp guage to see if there was a temp difference b/w running them or not.