So, I've been aching to go run my cars. Guess what? At 8:30 AM it's 100F already; at 6 PM it's 105F. I tried to run a few times and I felt like I was gonna die of heat stroke! I can't wait for it to get cooler. Oh, and my tune is totally off once it got above 105F outside. I had to lean it down so much it seemed like it was closing off the needles. Somebody turn on the outdoor ac in Las Vegas.
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Man...It's hot out here!!
- Thread starter emu67
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I hate heat.....sucks big fat hairy A$$!!!
I hate the weather where I live too.....miss snow...I feel bad for you......I guess you made me feel better knowing that I could be in an even worse hell than S FLorida.....
I hate the weather where I live too.....miss snow...I feel bad for you......I guess you made me feel better knowing that I could be in an even worse hell than S FLorida.....
And this has what to do with 1/8 scale buggies?
Moving this thread to the chaos forum
Moving this thread to the chaos forum
.21Rc10GT
Hardcore RCTalk User
Its only been in the mid 90s out here... its gotten up to 100+ 4-5 times so far this year... I'm waitin on the parents to buy the Jetskis they are talking about before summer ends...
PiErow said:
when it warms up the air gets thinner and your engine runs fatter......I hope you knew that right... :hammer:
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......Edit.....
Serious brain fart, I reread my post and realized I had typed it backwards. Sorry guys.
Serious brain fart, I reread my post and realized I had typed it backwards. Sorry guys.
Last edited:
sorry worded that wrong
...hot air has less volume of oxygen....
Cold air is has more volume of oxygen so you'd need to richen it up...
this I do know...
I do design HVAC systems to overcome S. Florida Humidity....
when the air flowing in has less oxygen content you need to lean it out so you are mixing the same volume to fuel you had when it was colder....I've always had this to be the case when humidity levels stay the same but temperature rises.....now there are other factors (especially for us NC) that will make you richen it up when temps go up......barometric pressre drops and humidity lowers...while temp increase will make you richen it up....typically here in S FL we have all kinds of mother nature's mood swings......have you ever been at a race and a gust of wind rolls in and everyone lean bogs????
...hot air has less volume of oxygen....
Cold air is has more volume of oxygen so you'd need to richen it up...
this I do know...
I do design HVAC systems to overcome S. Florida Humidity....
when the air flowing in has less oxygen content you need to lean it out so you are mixing the same volume to fuel you had when it was colder....I've always had this to be the case when humidity levels stay the same but temperature rises.....now there are other factors (especially for us NC) that will make you richen it up when temps go up......barometric pressre drops and humidity lowers...while temp increase will make you richen it up....typically here in S FL we have all kinds of mother nature's mood swings......have you ever been at a race and a gust of wind rolls in and everyone lean bogs????
AND Wait a minute ....You came to my back yard and didn't say hi?????
I'm so hurt dude....
:jk:
no I am hurt
well maybe a little scratch on my feelings....boo F'ing Hoo
I'm so hurt dude....
:jk:
no I am hurt
well maybe a little scratch on my feelings....boo F'ing Hoo
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I'm sorry man, it was a last minute thing. Plus I had the family with me. But I will be coming down again soon to race some 1/8 scale with ya.
okay the boo boo's gone....LOL..
funny how kids can change your vocab to match theirs.......
that's cool, let me know when you're ready....I'm gonna be all moved in by the end of next week.....can't wait....be able to work on my stuff the way I like to....leave it all taken apart on the coffe table for a few days...
And bring your A-Game cause I'm starting to creep up in the local racing scene anyway....last saturday came back from a 2 lap behind the last guy and pulled up to 5th out of 8....I was pretty immpressed w/ that move myself...hoping next race will be even sweeter......
funny how kids can change your vocab to match theirs.......
that's cool, let me know when you're ready....I'm gonna be all moved in by the end of next week.....can't wait....be able to work on my stuff the way I like to....leave it all taken apart on the coffe table for a few days...
And bring your A-Game cause I'm starting to creep up in the local racing scene anyway....last saturday came back from a 2 lap behind the last guy and pulled up to 5th out of 8....I was pretty immpressed w/ that move myself...hoping next race will be even sweeter......
Last edited:
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Sounds good. I still need to pick up a bump box and get my WS7II broken in, but as soon as it is I'm there!
BTW congrats on the comeback! Maybe one day you can have a special sticker too, lol.
BTW congrats on the comeback! Maybe one day you can have a special sticker too, lol.
IF I get an A-main first place I'll demand it....
I thought hot air was thinner than cold air???? That's what I've read everywhere... until today.
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Obviously you have never been in Florida in the summer, lol. The air is so thick it feels like trying to breath through a wet paper bag.
but only thought I would add to the confusion.
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Sorry about the earlier brain fart. This should help clear it up.
Temperature
Hot weather requires a leaner mixture setting; cold weather requires a richer setting. Most people assume the opposite because they treat the mixture needle like a thermostat. It is wrong to assume that colder weather requires a leaner setting to keep heat in the engine and vice versa. Cold air is denser than hot air. The denser, colder air packs more oxygen into the engine, so going from hot weather to cold needs a commensurate increase of fuel to balance ratio of fuel-burning oxygen and the fuel itself. The opposite is true in hotter weather. Going from cold to hot weather requires a leaner mixture setting.
Humidity
Humidity is the amount of moisture (water vapor) in the air. Moisture in the air takes up volume that would otherwise be occupied by fuel-burning oxygen. Less oxygen means less fuel is required to maintain a proper ratio of air and fuel. High humidity requires a leaner mixture setting than dry conditions.
Barometric pressure.
A barometer measures the atmospheric pressure (generally listed in the local newspaper or on the local weather forecast on TV). Higher barometric pressure readings mean more air is getting into the engine, requiring a richer mixture setting to balance the air/fuel ratio.
Altitude.
Altitude is an important factor that most of us ignore, yet it affects the engine’s performance possibly more than any other element. The general formula for power loss with increases in altitude is 3 percent for every 1,000 feet above sea level. If you race in Colorado at 5,000 feet instead of in California at sea level, you can expect to lose about 15 percent of the engine’s potential power output, if the engine is tuned properly.
Air is thinner at higher altitudes, which means there’s less fuel-burning oxygen than at sea level. You might sense a common theme here: less air (oxygen) means less fuel to maintain the proper air/fuel ratio. So, running at higher altitudes requires a leaner mixture setting than running at sea level.
This chart indicates the direction in which you should adjust the fuel mixture when faced with changing weather and other conditions. It assumes the engine is currently well tuned. You could face any combination of conditions listed in the chart; knowing which way to go with the mixture adjustments is half the battle.
Higher air temperature Lean
Lower air temperature Rich
Higher humidity Lean
Lower humidity Rich
Higher barometric pressure Rich
Lower barometric pressure Lean
Higher altitude Lean
Lower altitude Rich
Higher nitro content Rich
Lower nitro content Lean
Higher oil content Lean
Lower oil content Rich
Hotter glow plug Rich
Colder glow plug Lean
Info taken from RC Nitro
Temperature
Hot weather requires a leaner mixture setting; cold weather requires a richer setting. Most people assume the opposite because they treat the mixture needle like a thermostat. It is wrong to assume that colder weather requires a leaner setting to keep heat in the engine and vice versa. Cold air is denser than hot air. The denser, colder air packs more oxygen into the engine, so going from hot weather to cold needs a commensurate increase of fuel to balance ratio of fuel-burning oxygen and the fuel itself. The opposite is true in hotter weather. Going from cold to hot weather requires a leaner mixture setting.
Humidity
Humidity is the amount of moisture (water vapor) in the air. Moisture in the air takes up volume that would otherwise be occupied by fuel-burning oxygen. Less oxygen means less fuel is required to maintain a proper ratio of air and fuel. High humidity requires a leaner mixture setting than dry conditions.
Barometric pressure.
A barometer measures the atmospheric pressure (generally listed in the local newspaper or on the local weather forecast on TV). Higher barometric pressure readings mean more air is getting into the engine, requiring a richer mixture setting to balance the air/fuel ratio.
Altitude.
Altitude is an important factor that most of us ignore, yet it affects the engine’s performance possibly more than any other element. The general formula for power loss with increases in altitude is 3 percent for every 1,000 feet above sea level. If you race in Colorado at 5,000 feet instead of in California at sea level, you can expect to lose about 15 percent of the engine’s potential power output, if the engine is tuned properly.
Air is thinner at higher altitudes, which means there’s less fuel-burning oxygen than at sea level. You might sense a common theme here: less air (oxygen) means less fuel to maintain the proper air/fuel ratio. So, running at higher altitudes requires a leaner mixture setting than running at sea level.
This chart indicates the direction in which you should adjust the fuel mixture when faced with changing weather and other conditions. It assumes the engine is currently well tuned. You could face any combination of conditions listed in the chart; knowing which way to go with the mixture adjustments is half the battle.
Higher air temperature Lean
Lower air temperature Rich
Higher humidity Lean
Lower humidity Rich
Higher barometric pressure Rich
Lower barometric pressure Lean
Higher altitude Lean
Lower altitude Rich
Higher nitro content Rich
Lower nitro content Lean
Higher oil content Lean
Lower oil content Rich
Hotter glow plug Rich
Colder glow plug Lean
Info taken from RC Nitro
NCNitro said:
Been there, didn't like it... As I see, the hot/cold air thing has been cleared up.
Although, I find myself richening the mix on warmer days rather than leaning it. And leaning the mix to raise head temps in the winter instead of richening it... Maybe it's one of those "In Theory" things.
