Perfect conditions for monster power!
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Perfect conditions for monster power!

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    Default Perfect conditions for monster power!

    Can someone please tell me what the perfect conditions would be for highest HP. How cold is too cold....how dry is too dry....and how does altitude play in all of this. FOR A N/A MOTOR. Thank you.

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    Quote Originally Posted by dnewps View Post
    Can someone please tell me what the perfect conditions would be for highest HP. How cold is too cold....how dry is too dry....and how does altitude play in all of this. FOR A N/A MOTOR. Thank you.
    Kinsler's 100% air density calibration factors, 29.92 barometric pressure @ 59*. (I believe I remember water grains under 45 PPM as being acceptable but not part of a density gauge calibration). Contrary to popular belief, foggy nights do not create the best air for NA engines....Too much water in the air and water doesn't burn real well.........Ray
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    the calculator above indicates the colder the air the better....anyone know what conditions are best for HP....ideal conditions.

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    Quote Originally Posted by dnewps View Post
    the calculator above indicates the colder the air the better....anyone know what conditions are best for HP....ideal conditions.
    The first engine shop I used that had a dyno ran a few engines at night. I saw a few dyno sheets with air temps of 52-54* and a good barometer reading. The corrected numbers where under the observed numbers. The dyno program corrected down something like 8-12 hp.

    Can't tell you if 45* would have made more power.

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    A car and a boat run stronger in the winter...correct? The air is colder and more dense so a NA motor is getting more oxygen that is matched with more fuel thus more power....correct? How cold is too cold....I would image there to be more experiences with a boat since a car would not be drag racing in 30* temps (icy roads). Is there too much of a good thing? Is there an ideal temp for max HP?

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    Quote Originally Posted by Moneypit View Post
    Kinsler's 100% air density calibration factors, 29.92 barometric pressure @ 59*. (I believe I remember water grains under 45 PPM as being acceptable but not part of a density gauge calibration). Contrary to popular belief, foggy nights do not create the best air for NA engines....Too much water in the air and water doesn't burn real well.........Ray
    What about the cooling effect on combustion chamber temps and fighting detonation, or reducing chamber volume and raising compression a tad? It seems every car I've ever driven ran better on a foggy night.
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    Quote Originally Posted by dnewps View Post
    A car and a boat run stronger in the winter...correct? The air is colder and more dense so a NA motor is getting more oxygen that is matched with more fuel thus more power....correct? How cold is too cold....I would image there to be more experiences with a boat since a car would not be drag racing in 30* temps (icy roads). Is there too much of a good thing? Is there an ideal temp for max HP?
    You have to remember tht what you're trying to do is start a fire. While cooler air is more dense, and you can add more fuel, you're also making it harder to ignite.
    I don't know what it is, but at some point there has to be diminishing returns.
    I also don't believe in "cool cans" for fuel.
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    Quote Originally Posted by steelcomp View Post
    .
    I also don't believe in "cool cans" for fuel.
    I always wanted to hook one up on the dyno. I know two people who have used them, both swear by them. The turbo guy really loved his.

    Years ago Honda found that their turbo engines liked the air temp around 104* for best vaporization of fuel and best power:
    http://www.performanceboats.com//showthread.php?t=2357

    But they weren't burning gasoline.

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    Last edited by Sleeper CP; 10-28-2009 at 06:59 PM.

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    They have their place. But it is on a N/A motor. Same goes for alky or alky and water injection.



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    Does cooling the fuel really make more power?
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    I've seen pictures of some of the big names in Pro Stock back in the day such as Dick Landy running cool cans under the hood. But that was 40 years ago.

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    Quote Originally Posted by steelcomp View Post
    Does cooling the fuel really make more power?
    It can help a blower or turbo deal by absorbing more heat getting to the vaporization point. More power? It can help stave off detenation, and allow a little more timing. But all this kind of gets back to the original question of the thread. You can only have the intake so cold be fore the fuel won't vaporize quickly enough before ingition, and power falls off. But at the same time, I prefer not to have my fuel hot either. Like one year at Laughlin, 116 in the shade, and we after we filled the tanks, one hour later its perking out of the vents because it had expanded that much.



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    Quote Originally Posted by steelcomp View Post
    Does cooling the fuel really make more power?
    Nitro guys think so... cooling the fuel right before putting it in... in the staging lanes. NHRA must think so... they are no longer allowed to have a cooled fuel tank and from what I hear... chilling the fuel is now a no-no.

    But then again... that's nitro... and I believe the purpose is more towards being able to have the fuel at a higher percentage nitro with the temp correction facor seeing as they are now strictly enforcing the percentage limit during fuel checks... after the run.
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