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Weather affect running condition??

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Koobs120

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I'm new to the whole Nitro r/c stuff andI got a savage 25 not to long ago (about early sept.) and it was running great in the warmth but then when it finally got cold and i took it out it wouldnt run to great. i tried tuning it and stuff, me and my brother have been trying to figure it out, I've been having really bad problems. I was wondering what needle i would have to change and how? I took it out earlier today and i finally got it somewhat tuned in, not the greatest though. i was also wondering if i would need higher percent nitro to run in the snow, or if it would just take some fine tuning. Can you help me?? thanks~~ Al
 
The problem is the temperature outside. Humidity plays a big part in it as well.

The theory behind cold weather is that cold air is more dense, which means your air/fuel mixture gets messed up. So now, you have more air than you used to which means you should richen it. But, by richening it, it won't warm up right.

Even though it's colder outside, I still lean mine out a little bit until the temp at the glow plug is around 200 and I have a good smoke trail. Keeping the temps around 200 is the key with these engines. The don't operate properly when cooler.

Last winter, I made a sheild to cover my colling head fins so air couldn't go through them and cool the engine as easily. Basically, I just bought some aluminum flashing and a hoseclamp. I cut a piece of flashing that would almost wrap around the head and cover about 2/3's of the fins top to bottom. Then I put a hose clamp around it to keep it on and to keep it from vibrating which would cause radio interferance.

I only use the gaurd when it's below freezing out though. Normally, when the temps are above 35 you can run it a little leaner to keep the temps up without hurting the engine.
 
well, since i messed up the settings from the summer what should i do? set it back to the factory settings?? thanks again, Al :arrr:
 
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You should always take weather as a factor when tuning. Humidity and heat can throw your perfect settings way off. Olds has a very good understanding of how weather works. Use his advice.

Jon
 
Koobs120 said:
well, since i messed up the settings from the summer what should i do? set it back to the factory settings?? thanks again, Al :arrr:
Click to expand...

That would give you a starting point that should get it running. Normally, you only need to lean the high speed and tweak the low speed a little bit once you get it running ok.
 
Yup, revert to factory settings and retune if the settings have been messed with and you can't remember where you set them. I'm sure they're all out of whack.
 
Has anyone experimented with hotter plugs during the winter?
Maybe this would help to keep the temp up without leaning to much.



Tim K
 
yes actually, you can get away with a slightly hotter plug when it gets cold out, but make sure to check for detonation if you do change it.
 
A hotter plug doesn't help much. The point of cold, medium and hot plugs is to adjust the timing of the engine. It has nothing to do with temps of the engine itself. Normally, a 21 or larger likes a cooler plug. I use medium ones. Hot plugs tend to make a 21 run like crap, but they worked good in my 15 when I had it.
 

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