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Redglare · 09-23-2013, 05:39 PM

Science, I could go on and on, write a whole paper on how and why it's affected,

but basically; hot & humid air contains less molecules of Oxygen, when a hydrocarbon (gas) combusts, oxygen is the limiting reagent, the more O2 you have per square inch in air the more O2, the more fuel you dump, bigger explosion.

Vq37 was rated at sea level, almost all N/A engines are rated at sea level ~14.7 psi.

As far as temperatures... for every 10-11-degree Fahrenheit rise in intake air temperature past 77F, SAE Standard condition temperature (25C), you can expect engine horsepower to decrease by about 1% at the same barometric pressure.
(noticed I underlined intake air temperature), it's actually higher then outside ambient temperature, especially with the VQ running as hot as it does.

09-23-2013, 05:39 PM	#18 (permalink)
Redglare Enthusiast Member Join Date: May 2012 Location: FL Posts: 387 Drives: C172 Skyhawk GIII Rep Power: 175	Science, I could go on and on, write a whole paper on how and why it's affected, but basically; hot & humid air contains less molecules of Oxygen, when a hydrocarbon (gas) combusts, oxygen is the limiting reagent, the more O2 you have per square inch in air the more O2, the more fuel you dump, bigger explosion. Vq37 was rated at sea level, almost all N/A engines are rated at sea level ~14.7 psi. As far as temperatures... for every 10-11-degree Fahrenheit rise in intake air temperature past 77F, SAE Standard condition temperature (25C), you can expect engine horsepower to decrease by about 1% at the same barometric pressure. (noticed I underlined intake air temperature), it's actually higher then outside ambient temperature, especially with the VQ running as hot as it does. Last edited by Redglare; 09-23-2013 at 05:54 PM.