carb tuning

[RobH]

I'm obviously a novice and I don't know anything about setting up my carb outside of what the book tells me. I'm having trouble keeping an idle. Right now, I've got the idle stop screw cranked.

I'm on my second quart of Red Alert 10% nitro. (don't rag on me about buying quarts. i've learned the errors of my ways).

The car is fully broken in. NCNitro suggested I lean it out more now that it's broken in. I finally have my temp gauge; I'll have a battery for it tonight.

Can someone explain how to lean the engine out so #1 it idles better and #2 i get a little more umph out of it?

If there is a webpage or something where I can read this process instead of you typing it all out, I'd be gald to read it.

update: (the newbie strikes again)

Originally posted by NCNitro
Don't go by what the book says, thats only a starting point. There are no two engines that are going to have the exact same settings. Altitude, humidity, temperature, nitro %, as well as other things will affect tuning. As you start to lean it out a bit more on the lsn you will notice you can turn the idle screw back out, don't go too far though, thats where the temp gun comes in real handy. Just make sure you always see a nice stream of smoke coming from the exhaust under acceleration.

Heres an article from RC Nitro about engine tuning.

Engine Tuning

-rob

 

[NCNitro]

I just posted this in the other thread, I guess you missed it.

Engine Tuning

Dont worry about it Rob, the other thread had kinda went off course anyway.

 

[RobH]

I read that article.

what I learned.

Biggest thing: adjust it after the thing is completely warm.

hsn: leaner means faster but it also means hotter. too hot and you damage your engine. As you increase the throttle, the mix will lean out. Because of this fact, you have to adjust the needle for what you want to do. If you want to run full-out, you're going to have to set it a little rich so you get plenty of fuel and lubricant at the high rpms. If you want acceleration, you can lean it out but you can't run full throttle for a long period as you will kill the engine. Now that I have my temp gauge, how hot is too hot? anything below 270-280 is ok?

lsn: adjust this last. make it so the car will idle for 20 - 30 seconds at most or do that weird acceleration/deceleration thing (but i think I'll save that for when I know more)

idle stop screw: dont crank it, use the needles to get the thing to idle (dumb dumb me don't know anything )

i think i got all of this right. i think if I make small adjustments and just make sure I don't overheat it, I'll learn what I need to in time.

-rob

 

[Candyman]

Very good Grasshopper. You have learned well.

You learn more by breaking it than by just looking at it.

 

[Akina'sMtx-2]

Your going the right direction Rob. How hot is hot? Will it really depends on the construction of the engine and what engine. It also depends on Glow plug, fuel, etc... For that engine, keeping it below 240F is pretty good.

 

[NCNitro]

glad the article helped.