help!!!!
08-03-2003 | 01:44 AM
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From: manitoba
help!!!!
ok, I'm totally green to rc racing and I just purchased a phantom rc 4wd...I can't get it to run properly!!..the idle is way to high and it stalls alot, and there is no high end t the truck....I need help..BIG TIME!!! can anyone help me??????Please.......
08-03-2003 | 02:43 AM
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From: Winchester,
VA
help!!!!
The first thing I'd suggest is to take it to a local hobby shop. Car and truck engines can be a bit harder to get set properly since they tend to run hotter and are harder to get to. Not to mention you can't use a tachometer to help set it.
Otherwise the idle speed will mostly be set by using the transmitter trim. If it's too high try adjusting the throttle trim lower. You will likely then find that it is running too lean, I think. Most often I have found on cars and trucks that if they stall a lot they are set too lean. Try setting the high end needle valve at 3 turns out from fully closed. Then you can turn in small increments in from there until it runs good at top end. If the engine has a low end you should consult the manual for where to set the low end needle valve.
Your engine will run better rich than lean. I didn't say it would run well, but if the engine is rich it will run, usually, if it's too lean you canactually harm the engine fairly quickly.
Another thing to consider is that if the idle is too high and it's not moving the clutch may be set wrong or burned/glazed so it won't hold anymore.
Otherwise the idle speed will mostly be set by using the transmitter trim. If it's too high try adjusting the throttle trim lower. You will likely then find that it is running too lean, I think. Most often I have found on cars and trucks that if they stall a lot they are set too lean. Try setting the high end needle valve at 3 turns out from fully closed. Then you can turn in small increments in from there until it runs good at top end. If the engine has a low end you should consult the manual for where to set the low end needle valve.
Your engine will run better rich than lean. I didn't say it would run well, but if the engine is rich it will run, usually, if it's too lean you canactually harm the engine fairly quickly.
Another thing to consider is that if the idle is too high and it's not moving the clutch may be set wrong or burned/glazed so it won't hold anymore.
08-03-2003 | 04:56 AM
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From: Mary Esther, Florida, FL
help!!!!
Chris:
On r/c cars the idle has to be set with the screw on the carb as the backwards motion of the throttle servo is used to operate the brakes. And you can't set the carb using the same method you use for a plane.
hopeless:
It's not hopeless. (Sorry, couldn't resist) As Chris said, set your high speed to peak, then back it out until it just drops into a four cycle. You CAN NOT peak the engine and expect it to run well on a car. Bring the engine back to idle, then nail it to full throttle. If it comes off idle with no problem, then run it and see how it sounds. If it just dies when you nail it open the idle screw just a little bit and recheck. You want it to burble just a little bit and then come on, or accellerate cleanly.
In addition to not cooling when you're sitting still, you don't have any load on the engine - you have to run it to check the mixture. Should burble at full throttle with the wheels off the ground, and pick up clean when going on the road.
HTH.
Bill.
PS: You have to do all this pretty fast because you aren't cooling when you're sitting. wr.
On r/c cars the idle has to be set with the screw on the carb as the backwards motion of the throttle servo is used to operate the brakes. And you can't set the carb using the same method you use for a plane.
hopeless:
It's not hopeless. (Sorry, couldn't resist) As Chris said, set your high speed to peak, then back it out until it just drops into a four cycle. You CAN NOT peak the engine and expect it to run well on a car. Bring the engine back to idle, then nail it to full throttle. If it comes off idle with no problem, then run it and see how it sounds. If it just dies when you nail it open the idle screw just a little bit and recheck. You want it to burble just a little bit and then come on, or accellerate cleanly.
In addition to not cooling when you're sitting still, you don't have any load on the engine - you have to run it to check the mixture. Should burble at full throttle with the wheels off the ground, and pick up clean when going on the road.
HTH.
Bill.
PS: You have to do all this pretty fast because you aren't cooling when you're sitting. wr.
