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Engine basics => Engine set up tips => Topic started by: frank carlisle on May 31, 2006, 06:24:38 AM
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It's hot and muggy---More nitro or less nitro? that is the questiom.
I've been feeding my B .40 5% nitro and 23% oil & castor mix. A couple years ago in the hot weather Jan and I postulated that less nitro would let the engine run cooler/better in hot humid weather.
What are your thoughts on this please. ;D
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Some will disagree; however, it has been my experience that more nitro will allow more liquid to move through the engine and cause the engine to run cooler.
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It's hot and muggy---More nitro or less nitro? that is the questiom.
I've been feeding my B .40 5% nitro and 23% oil & castor mix. A couple years ago in the hot weather Jan and I postulated that less nitro would let the engine run cooler/better in hot humid weather.
What are your thoughts on this please. ;D
Hi Frank
Most alway we go up on nitro when it gets into hot months,
Reasons are, when it gets hot and humid , power goes down, in order to get it back some people turn the needle in leaner, this just makes for a hotter running engine.
If you add nitro, it give more power and lets you run the needle at a richer setting thus not making the engine run hotter. It also requires you to run more fuel thru the engine for the same amount of flight time, thus cooling it more.
Regards
Randy
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What Randy said............ y1
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One advantage of nitro is that it actually supplies oxygen to the combustion process. On hot muggy days, there is actually less oxygen in each breath the engine takes. Without doing anything the mixture actually is on the rich side. Leaning it a bit will give more power, but since you are actually now burning less fuel and air, the power will be down compared to the same mixture on a nice dry cool day. f~
Adding nitro on that hot and humid day gives you that extra oxygen, so you more or less can leave the needle where it was on the cool day and have effectively the same mixture setting. So now your engine is happy.
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thanks everbody.................
i thought it was the other way around.
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Frank..
I knew you liked things backwards!! ;)
Curt