Originally Posted by a.j. hall
Alright thanks. How much Hp difference would setting it for mid grade make than setting in for 93 make?
It will probably be a wash: higher compression ratio improves combustion efficiency, however, you will probably have to run less spark. Spark timing, depending where you are on the MBT curve, is more potent than compression ratio.
I would rather have an engine I could run midgrade in and run a bit more advance than a high compression motor that I had to pull spark out of to run without detonating. Besides, you're young and don't have tons of money - you'll cheap on fuel when you're broke and running regular unleaded in a mild engine is better than on something with so much compression.