carb settings
01-27-2006 | 12:43 PM
#1
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From: Avon,
IN
carb settings
when setting your high needle setting on your carb, what do you look for to tell when it is set properly? what signs? exhaust...???? HELP
01-27-2006 | 12:53 PM
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From: Tallahassee, FL
01-27-2006 | 02:18 PM
#3
RE: carb settings
Hi!
Setting any engine is done by ear! That simple. This is something you just have to learn if you want to be successfull in R/C.
What you do is to start the engine at idle and then give full throttle and slowly turn the highspeed needle in so that the rpm goes up.
When you reach nearly max rpm you just back off a little (maybe 100-300rpm) so that the engine will rew slightly less than max rpm. Why you do this is because the engine rews up slightly in the air and needs the extra fuel.
Engines allways rew up slightly in the air due to the unloading of the prop when the air comes rushing toward the prop. When you set the highspeed needle slightly rich you give the engine a chance to rew up and reach its max in the air. This is how pylonracers as well as knowing sport pilots set their engines.
Never trust the smoke coming out of the silencer or pipe. People sometimes say "I set my engines so I see smoke coming out of the silencer" This method is too blunt and doesn't say enough how the engine "is feeling".
The only way exact way to set an engine is to listen to it, and act accordingly! And this is something you can learn.
Regards!
Jan K
Sweden
Setting any engine is done by ear! That simple. This is something you just have to learn if you want to be successfull in R/C.
What you do is to start the engine at idle and then give full throttle and slowly turn the highspeed needle in so that the rpm goes up.
When you reach nearly max rpm you just back off a little (maybe 100-300rpm) so that the engine will rew slightly less than max rpm. Why you do this is because the engine rews up slightly in the air and needs the extra fuel.
Engines allways rew up slightly in the air due to the unloading of the prop when the air comes rushing toward the prop. When you set the highspeed needle slightly rich you give the engine a chance to rew up and reach its max in the air. This is how pylonracers as well as knowing sport pilots set their engines.
Never trust the smoke coming out of the silencer or pipe. People sometimes say "I set my engines so I see smoke coming out of the silencer" This method is too blunt and doesn't say enough how the engine "is feeling".
The only way exact way to set an engine is to listen to it, and act accordingly! And this is something you can learn.
Regards!
Jan K
Sweden
01-27-2006 | 02:32 PM
#4
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RE: carb settings
The high end is a no brainer, problems are usually with the low. When you think you have it, let the engine idle, then pinch the line or remove it until the engine quits. If the rpms increase as the engine quits. Low end is to rich. If the rpms just go down and quit, low end to lean. I set mine for a very slight increase.
You need to have a system that shows you that the adjustments you made took effect and this is it. It could take a coupl e tanks fulls to nail it but after that, I run mine all season without messing with the low end
You need to have a system that shows you that the adjustments you made took effect and this is it. It could take a coupl e tanks fulls to nail it but after that, I run mine all season without messing with the low end
