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HomeAircraftHelicopterMain Discussion › Carbsmart question
04-19-2011 09:45 AM  7 years agoPost 1
Hamo

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Ireland

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Am I correct in thinking that this device works best when 30% nitro is used ? I couldn't get good results with 15% fuel.
Hamo

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04-19-2011 01:37 PM  7 years agoPost 2
ShuRugal

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Killeen, TX

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might be your engine likes 30% better than 15%

When running 15% fuel, did you make sure the engine was properly tuned to run without the carbsmart before setting it up? The carbsmart can only adjust your high-speed needle, so if your low-end mix is off, it won't be able to do as good a job.

AMA 700159

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04-19-2011 01:37 PM  7 years agoPost 3
TheWoodCrafter

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Costa Mesa, Ca.

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I don't think the nitro content matters.
How it is setup is what makes the difference.

What were the results that you got?

Thanks, TheWoodCrafter

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04-19-2011 02:29 PM  7 years agoPost 4
Hamo

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Ireland

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The results I got.
It appeared to be working in the correct sense but, kept wanting to make the mixture richer, until it was so rich, the engine had little power. I tried it with an OS32 and an OS 37
Hamo

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04-19-2011 04:54 PM  7 years agoPost 5
wc_wickedclown (RIP)

rrProfessor

long beach calif

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Hamo The results I got.
It appeared to be working in the correct sense but, kept wanting to make the mixture richer, until it was so rich, the engine had little power. I tried it with an OS32 and an OS 37
sounds like your cs end points need some adjustment.

mine is setup so it will only give one click instead of quarter turn

Insha Allah made in america

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04-19-2011 10:02 PM  7 years agoPost 6
GMPheli

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W. Bridgewater, MA USA

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"It appeared to be working in the correct sense but, kept wanting to make the mixture richer, until it was so rich, the engine had little power. I tried it with an OS32 and an OS 37"

Don't forget, you are tuning by heat now. I know of one instance where a sensor was bad and the same thing happened. The carbsmart thought the engine was hotter than it was. But that doesn't necessarily mean thats what is going on here. Did you use the same sensor on both engines somehow? Do you have any idea what temp your engine was running at before installing the carbsmart? Could it be that your motor was running on the hot side before? If you have access to a temp gun, try to see if the carbsmart is working at the temp you have it set for. Don't forget your engine temperature will vary with the outside temp. This is especially true with lower nitro. You have to adjust your carbsmart settings accordingly. What temp are you flying in and what is it set for? It may surprise you how hot your engine has been running pre carbsmart

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04-20-2011 12:58 AM  7 years agoPost 7
TheWoodCrafter

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Costa Mesa, Ca.

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A CarbSmart works great when adjusted properly.

End point adjustment to limit the adjustment range and setting the temperature for the day temperature and the machine. A setting of 110C for one machine may be different for another machine. And setting them up is really a matter of a few flights, pretty easy and fast.

Did you glue the sensor in with the correct thermal glue?

Thanks, TheWoodCrafter

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04-20-2011 01:59 AM  7 years agoPost 8
KingJoeMack

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New Baltimore, Mi USA

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You were more than likley Very rich to start with, and as the engine heated up, the carbsmart did what it is suspose to do, make it richer, now it was blubbering rich.
Tuning before mounting the carbsmart arm, is important.
Use your finger, a heat gun, or have someone with tuning experience, help you out.
Going to Mfg. suggested needle settings is a good start.

Fly with scheduled ground contact !

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04-20-2011 02:12 AM  7 years agoPost 9
MartyH

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USA

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Wow, Carb Smart. I'd forgotten about that device already. I had a couple and didnt like them so I sent them down the road. Is anyone still using this?

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04-20-2011 03:00 AM  7 years agoPost 10
freakyreef

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Kansas\Colorado border

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Wow, Carb Smart. I'd forgotten about that device already
Yup, still use one and love it. I have it set up to give me about an eighth of a turn. Do I NEED it?? Nope, but I like it so why not.

Walk on water long enough, eventually you will get your feet wet.

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04-20-2011 03:52 AM  7 years agoPost 11
TheWoodCrafter

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Costa Mesa, Ca.

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Wow, Carb Smart. I'd forgotten about that device already.
I love mine.
I will put one on the next nitro bird I get also.

Thanks, TheWoodCrafter

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04-20-2011 06:13 AM  7 years agoPost 12
wc_wickedclown (RIP)

rrProfessor

long beach calif

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MartyH Wow, Carb Smart. I'd forgotten about that device already. I had a couple and didnt like them so I sent them down the road. Is anyone still using this?
yep

Insha Allah made in america

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04-23-2011 07:58 PM  7 years agoPost 13
oopsididitagain

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Dubai

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this device does not eliminate the need to know proper nitro tuning right?

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04-23-2011 08:08 PM  7 years agoPost 14
DOKEY

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Northamptonshire UK

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Correct, you still need the knowledge in engine tuning, this device just helps for the variation in engine tuning during flight.

Ryan.

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04-23-2011 08:11 PM  7 years agoPost 15
RyanW

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Edmond, Oklahoma

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this device does not eliminate the need to know proper nitro tuning right?
Correct. Tune as you normally would. The CarbSmart allows you to run your normal needle setting leaner than normal. Typically you tune an engine to keep it from leaning out. That is fine, but you do not always need the needle setting that rich throughout the flight. The CS leans and richens as you go. I ended up getting better performance and fuel economy.

Initially I set the default (middle) to normal needle settings. After confirming everything functions 100%, I will make the default a little leaner, knowing the CS will richen as needed.

Make sure you don't have the middle setting excessively lean though. If you have a sensor failure, you don't want to damage the engine.

-Ryan
Mikado USA, Kontronik, Opti-Power, MKS Servos

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04-23-2011 08:18 PM  7 years agoPost 16
MartyH

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USA

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They were very sensitive to sensor failures. They need to be potted and strain relieved and watched. CarbSmart should be set up to not allow needle travel that can cause the engine to lean out and scuff should the sensor fail.

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04-23-2011 10:32 PM  7 years agoPost 17
freakyreef

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Kansas\Colorado border

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Here was my setup. Fly the heli first and find what seems to be the sweet spot at a half full tank. Use this as your fully lean position. Then enable carbsmart and fly a normal flight with the temp setting 100. Land and check the position of the mixture servo. It should be at more than 3/4 travel to nearly full lean at the end of the tank. There is a failsafe built into the unit so if the sensor fails it will go to the center of servo travel. This is the reason you don't want to have it set at full lean at center servo travel. If the unit were to go into failsafe, you would be running at full lean.

Just my 2 cents worth. BTW still on my first completely stock sensor and have been using it for years now.

Walk on water long enough, eventually you will get your feet wet.

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04-23-2011 11:19 PM  7 years agoPost 18
GMPheli

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W. Bridgewater, MA USA

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I set both the normal and lean settings to your normal needle valve setting. This way if the motor goes hot, it richens. If the sensor fails, it goes to the normal setting, and if the sensor becomes disslogded, it goes to the lean setting (which is also the normal setting)

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04-24-2011 01:37 AM  7 years agoPost 19
MartyH

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USA

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Yep, that's a safe way to go GMP. The guys that try to use them to truly lean them get in trouble.

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04-24-2011 02:17 AM  7 years agoPost 20
freakyreef

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Kansas\Colorado border

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I set both the normal and lean settings to your normal needle valve setting. This way if the motor goes hot, it richens. If the sensor fails, it goes to the normal setting, and if the sensor becomes disslogded, it goes to the lean setting (which is also the normal setting)

So you set your full lean and full rich servo position to the same position??? I am sure I am misunderstanding you on this one. If you do that, the servo wont move at all.

Walk on water long enough, eventually you will get your feet wet.

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