intake air temp (iat sensor)

[shane96ranger]

For what it's worth, I have a Craftsman which is dead on with my Dad's Fluke (best meter you can buy IMO). I keep a cheap Harbor Freight meter in my truck and it's not too far off from my Craftsman and the Fluke. I've tested them against each other for voltage and resistance.

Sent while I should be doing something else

 

[bigredrangero]

so ive been thinking a little more about this whole thing and if the iat is reading it is geting cold air the engine wouldnt need as much fuel. right? creating a false lean condition right? which i have because my plugs are burnt white as a ghost

Cooler air means more fuel, i.e. richer. Means more power

 

[scotts90ranger]

Cooler air means more fuel, i.e. richer. Means more power

um no, cooler air means more oxygen molecules per given volume, without adding more fuel that would make a lean mixture, it takes more of both to make more power not just "richer". You make more power staying as lean as you can close to stoichiometric so you aren't displacing oxygen with fuel, it's a fine balance really... at some point you have to start adding more fuel to cool the combustion temperatures so you don't melt valves and pistons but yeah, you aren't adding fuel to make more power at that point it's adding more fuel to allow you to make more power...

 

[lil_Blue_Ford]

um no, cooler air means more oxygen molecules per given volume, without adding more fuel that would make a lean mixture, it takes more of both to make more power not just "richer". You make more power staying as lean as you can close to stoichiometric so you aren't displacing oxygen with fuel, it's a fine balance really... at some point you have to start adding more fuel to cool the combustion temperatures so you don't melt valves and pistons but yeah, you aren't adding fuel to make more power at that point it's adding more fuel to allow you to make more power...

Also I’ll add that over-fueling can increase exhaust temps significantly, and destroys catalytic converters, so the balance is absolutely necessary. Rangers came stock with a CAI from the factory and the intakes rated for better flow than the stock engine needs. If you want colder air, you need to do a methanol injection. It’s all a balancing act for best performance.

 

[scotts90ranger]

That is also not quite true, extra fuel on a gasoline engine actually cools off the exhaust. The only time that happens is when there is extra fuel AND air, IE a misfire condition, remember you can throw a lit match in a fuel tank (don't try at home...) and put it out, you need oxygen too... I mean if you have enough fuel to make it misfire that is basically the same thing but takes a lot more gas unless you have weak spark... We run engines at work down to around 11:1 with cats and don't have problems unless there's misfires or since they're usually marine applications if you get some water reversion for whatever reason hot catalysts don't like that either... neither metal or ceramic substrate appreciates that

If we were talking propane or natural gas sure, those if you add more fuel the exhaust will in fact get hotter since you don't have the cooling of the vaporization process...