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air density
I was driving somewhere in Tennessee on a 6 grade road of 8 miles or so, and the elevation change got me thinking. What effects does elevation/baro has on fe. To expend it little more lets add air temperature to that. I've been playing with increasing my air temp temps and watching fe, it's been increasing up to about 120F ish, anything over that and the results stayed about the same, but I started experiencing more of a spark knock. I haven't had any time to experiment with different baro/elevation. In theory I could see your fe increasing from a lower baro pressure due to having less O2, but how would increased air temp would effect the engine?
Ideally, I am probably looking at 3 variables that I'd like to know how they both work together and what effects it does to fe and if there is a perfect combo. The 3 variables are engine static compression, air baro pressure, and air temperature. The reason I added static compression into the equation is because baro pressure effects dynamic compression. Basically at higher elevation you can run higher static compression on pump gas than at sea level. Excessive static compression, excessive air temps, higher baro pressure will make the engine to experience spark knock more likely.
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