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-   -   Intake Temps/power Gains (https://www.nopistons.com/2nd-generation-specific-17/intake-temps-power-gains-31758/)

j9fd3s 01-13-2004 10:45 AM


Originally Posted by FCmaniac' date='Jan 13 2004, 07:11 AM
So you guys are saying 1% power increase with nothing else changing? I was thinking the #'s could be more because the 10 degree decrease or whatever could allow you to turn up the boost a little, no?

i wonder if theres a point at which you get no gains, or less gains

twstdmtl 01-13-2004 11:47 AM


Originally Posted by j9fd3s' date='Jan 13 2004, 08:45 AM
i wonder if theres a point at which you get no gains, or less gains

Good question! There prolly is a cap on cooling.

RONIN FC 01-13-2004 02:25 PM

Thats only part of the equasion. Each 25 degree reduction requires 1 point less octane. Meaning you have more available octane = less detonation / preignition.

neevosh 01-13-2004 03:12 PM

Where'd you guys hear about the 10 degrees equals 1% rule? I've never heard that one before.



For every degree lower in intake temp, it's one degree lower in exhaust temp.

RONIN FC 01-13-2004 04:01 PM


Originally Posted by neevosh' date='Jan 13 2004, 01:12 PM
Where'd you guys hear about the 10 degrees equals 1% rule? I've never heard that one before.



For every degree lower in intake temp, it's one degree lower in exhaust temp.

Various engine building books. Info from Sparco, Greddy, Hks.

RONIN FC 01-13-2004 04:22 PM

How about all the people who have cone filters sucking in air from the engine bay. Im not sure but i would estimate the air in the engine bay to be well over 250 degrees. Do the math.

FCmaniac 01-13-2004 06:03 PM


Originally Posted by RONIN FC' date='Jan 13 2004, 06:22 PM
How about all the people who have cone filters sucking in air from the engine bay. Im not sure but i would estimate the air in the engine bay to be well over 250 degrees. Do the math.

Yeah, most of the gains from warm air intakes are from increased flow, not temp.

1Revvin7 01-13-2004 07:17 PM


Originally Posted by RONIN FC' date='Jan 13 2004, 05:22 PM
How about all the people who have cone filters sucking in air from the engine bay. Im not sure but i would estimate the air in the engine bay to be well over 250 degrees. Do the math.

130-160 degrees under the hood depending on location.

j9fd3s 01-14-2004 10:42 AM


Originally Posted by RONIN FC' date='Jan 13 2004, 12:25 PM
Thats only part of the equasion. Each 25 degree reduction requires 1 point less octane. Meaning you have more available octane = less detonation / preignition.

well cold air is more dense, so you need more gas to run at the same mixture or cold = leaner, hot = richer

RONIN FC 01-14-2004 11:01 AM


Originally Posted by j9fd3s' date='Jan 14 2004, 08:42 AM
well cold air is more dense, so you need more gas to run at the same mixture or cold = leaner, hot = richer

This is true. But nothing the ECU shoudnt detect and compensate for. Unless you have a carb.


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