Ok since it was hot a balls last Sunday and everyones mph was down it made me wonder........

If the outside temp is higher which in turn means that the air is less dense(less oxygen molecules) then wouldn't that mean the a/f would be richer since there would be less oxygen/air molecules in the cylinder?

Now with that in mind let me ask u this. If that statement is correct on the days that the air is hot/less dense, would it be safe to say that in order to make up for a richer mixture one would lean out the car to offset for the surplus of fuel?

And last question with both of the above statements. What would this do in relation to possible detonation? Or is that also related to a timing factor? Thanks.

-Mark

 

If the air is less dense, less fuel will burn. Cant burn fuel without air. That would be my idea anyway.

 

You are correct, Sir, but don't forget humidity either. On a sticky sultry day, you are jaming more water in there than on a low humidity day. Thhe temperature/density thing is what blew me up...well, not really, stupidity blew me up. I knew I was going to be lean on that nasty cold ass day. I just got in a hurry and didn't compensate for it and ended up leaning out. The extra oxygen from the denser air went looking for something else to combine with and found my nice aluminum piston.

As for the detonation, LOTS of things come into play on that. Things like octane of the fuel, timing, compression ratioo, temperature of the air charge, whether you have any sharp edges inside the chamber that tend to glow red hot, carbon buildup that glows, a messed up quench area in the combustion chamber...things like that.

If it were simple, nobody would ever blow up.

 

Ok. So in summarizing, on a hotter day if I were to lean the car out more I wouldn't necessarly gain more power because I'm not getting more oxygen/air into the cylinder but just running a higher a/f ratio. Due to the maf/eec is compinsating for the crappy air? So which would I have a higher chance of detatinating hotter weather or cooler weather? -Mark

 

cooler weather will cause a lean condition if not tuned for the cooler weather........


hot air makes it more likely to detonate too............

on the stock tune i'd say in the heat is the most dangerous... but the stock tune is so damn rich anyhow, i dont think you will have trouble



also, on fords the IAT sensor controlls the A/f somewhat and the timing somewhat...


this is where the IAT resistor trick works....... but you have to keep resetting the computer, because it will always compensate after a little while.......


best thing to do is get a couple of tunes maybe? or run race gas to lessen the chance of detonation.......









OR.......... DROP A CARBED 302 IN IT.........