Wrong thread

Originally Posted by jlc

I could see with a lot of these new servo's being so fast that it might be an issue but you should be able to get your engine tuned that you can slam the throttle and have it come to life immediately because unfortunately you might need it to one day. Maybe your to concerned with a mid range burble that might disappear with some more time on the engine.

Regarding "may need it one day" I would be willing to bet all the beer you could drink in one session that you would not be able to detect a "throttle delayed" setup, by watching or by flying, vs. the more conventional set up. And trust me, I was as surprised as anyone else when I was talked into trying it.

If you ever need it, don't be shy to at least try it. You're only talking about 2-3 minutes max to defeat it and put it back to normal if it doesn't work as expected. Upside is you may be in for a pleasant surprise....



-Al

Set up throttle curve using a tachometer.

Originally Posted by AHicks

Regarding "may need it one day" I would be willing to bet all the beer you could drink in one session that you would not be able to detect a "throttle delayed" setup, by watching or by flying, vs. the more conventional set up. And trust me, I was as surprised as anyone else when I was talked into trying it.

If you ever need it, don't be shy to at least try it. You're only talking about 2-3 minutes max to defeat it and put it back to normal if it doesn't work as expected. Upside is you may be in for a pleasant surprise....



-Al

I don’t need to, I don’t have an engine that stumbles when the throttle is punched. Truckracer might have a point though I just have big displacement engines. I haven’t had anything smaller than a 150cc for the last 5 years.

Thank you everyone for your suggestions and ideas.

Not sure if this is a tuning problem or something else. I have never seen or heard of this before. Motor starts but it won't transition. When you increase the throttle it bogs down in the mid range and will die. If you baby it through the mid range a little at a time it clears out eventually and runs good for a full flight. Thoughts?

Originally Posted by Timh

Not sure if this is a tuning problem or something else. I have never seen or heard of this before. Motor starts but it won't transition. When you increase the throttle it bogs down in the mid range and will die. If you baby it through the mid range a little at a time it clears out eventually and runs good for a full flight. Thoughts?

Lean low speed needle

Originally Posted by Timh

Not sure if this is a tuning problem or something else. I have never seen or heard of this before. Motor starts but it won't transition. When you increase the throttle it bogs down in the mid range and will die. If you baby it through the mid range a little at a time it clears out eventually and runs good for a full flight. Thoughts?

I would ask for more information:

When you say it bogs down.... does it stutter and spit and then die? Or does it just go Wahhhnt. ?

What happens after you fly? Can you re-fuel immediately and fly agin with no issue? Or do you have to baby it through again?

I fly only DA, so can't say about others. But in order for me to get my motors to transition and really be super responsive in flight, I have to keep my low end needle lean out right up to the point of almost too lean. When I start a cold motor, it won't spool up. I let it sit and run for maybe a minute to warm up. Then I still have to baby it to spool up. I usually work the throttle up and down rapidly to get it to work through the transition at first. But once I get her rev'd up, I am good to go. Then when flying I have super responsive motor even at low middle.

I DO USE AN IDLE UP SWITCH to prevent dead stick!

Originally Posted by Timh

Not sure if this is a tuning problem or something else. I have never seen or heard of this before. Motor starts but it won't transition. When you increase the throttle it bogs down in the mid range and will die. If you baby it through the mid range a little at a time it clears out eventually and runs good for a full flight. Thoughts?

I too, was wondering when this happens; 1st flight of the day or anytime after the engine sits and gets cold? All of my engines (DA's & DLE's) exhibit this behavior on 1st flight of the day. I will start the engine and let it idle for a minute or two, so that the engine warms up. Then I have to "clean out" the engine with several rapid low-high-low throttle stick movements. This does the trick for me and I'm good to go for the rest of the day. But if I end up sitting on my duff for an hour or so, I end up repeating this procedure.

Originally Posted by deadrobmusic

I would ask for more information:

When you say it bogs down.... does it stutter and spit and then die? Or does it just go Wahhhnt. ?

What happens after you fly? Can you re-fuel immediately and fly agin with no issue? Or do you have to baby it through again?

I fly only DA, so can't say about others. But in order for me to get my motors to transition and really be super responsive in flight, I have to keep my low end needle lean out right up to the point of almost too lean. When I start a cold motor, it won't spool up. I let it sit and run for maybe a minute to warm up. Then I still have to baby it to spool up. I usually work the throttle up and down rapidly to get it to work through the transition at first. But once I get her rev'd up, I am good to go. Then when flying I have super responsive motor even at low middle.

I DO USE AN IDLE UP SWITCH to prevent dead stick!

Originally Posted by mm2icbm

I too, was wondering when this happens; 1st flight of the day or anytime after the engine sits and gets cold? All of my engines (DA's & DLE's) exhibit this behavior on 1st flight of the day. I will start the engine and let it idle for a minute or two, so that the engine warms up. Then I have to "clean out" the engine with several rapid low-high-low throttle stick movements. This does the trick for me and I'm good to go for the rest of the day. But if I end up sitting on my duff for an hour or so, I end up repeating this procedure.

I happens everytime during the same day of flight. I am not sure, if you land, fuel up and start again. I would say if you just trasition from low to high it would "Wahhhnt" and die. If you coax it, it spits and sputters. It is a DA 50.

Originally Posted by Timh

I happens everytime during the same day of flight. I am not sure, if you land, fuel up and start again. I would say if you just trasition from low to high it would "Wahhhnt" and die. If you coax it, it spits and sputters. It is a DA 50.

If it spits and sputters, you are probably rich on the low end needle. Try turning the low end needle in and see what happens. But move it just a little at a time.

I’ve been following Terry’s method for all my gas engines, but my ear must be wrong. My motors all will idle all day, do not hesitate at all when I jam the throttle to full. When I cut the throttle from full, they go right to an RPM and stay there. However, when I look at my plugs and headers, it sure looks like I’m running rich.

What could I be doing wrong?

It looks like it may be SLIGHTLY rich. You could always try turning the low end in just a bit, see what happens.... Then again, if it ain't broke????

Originally Posted by gobigdave

I’ve been following Terry’s method for all my gas engines, but my ear must be wrong. My motors all will idle all day, do not hesitate at all when I jam the throttle to full. When I cut the throttle from full, they go right to an RPM and stay there. However, when I look at my plugs and headers, it sure looks like I’m running rich.

What could I be doing wrong?

First, that plug has some time on it so it is almost impossible to read it. Second and most important, if your engine is running as you expect it to run and you are happy with it, it is tuned correctly for you! That is more important than any plug reading. Now if you are after that last tiny bit of power then plug reading might be important. I'd say that plug looks about average for one that has been in the engine for awhile.

What oil are you using and what is the mix ratio to gas? Also, what engine did that plug come out of?