How do I adjust low end setting?
 

I was wondering if anyone could help me with setting my low end needle on my tower hobbies .46. I'm having problems with it shutting off. I know these motors have bad airleaks. I dont think I have any leaks now. But I also know that a low end needle setting will keep it from shutting off also. If I close it all the way, how many turns do I open it to get it set properly? Thanks for any help you can offer me on this.

RE: How do I adjust low end setting?
 

Getting the low end mixture correct has nothing to do with being able to shut the engine off using throttle trim... If you are sure your engine does not have an air leak then the most likely culprit is a set screw that is preventing the throttle barrel from closing fully. A simple test is to kill the engine by placing your finger over the carb inlet. If it keeps running you have an airleak. If it dies then your throttle is likely not closing fully. I would adjust the low end mixture to be lean enough that the engine will not load up and die after idling for a minute or two...

RE: How do I adjust low end setting?
 

Read the instructions...

RE: How do I adjust low end setting?
 

I dont need a smartass answer. I bought this engine used. Meaning NO PAPERS with it.

RE: How do I adjust low end setting?
 

BIGUGLYSTICK....

....I'm sorry about the answer offered by "former member"
Proteus to you question....:eek:....

If I may....you need to make absolutely sure that the carb
is seated fully against the o-ring on the Tower engines....
if not, you can get a leak there that will not allow to engine
to die when you chop the trim down to kill it. Also, you
should make sure that the hole in the barrel goes past what appears to be the fully closed position by 1/16, to 1/8 inch.
Even the smallest amount of air getting into the carb will
make the engine hard to kill.

Kinda' funny....the biggest complaint about the Tower motors
is how to stop them from running....[sm=biggrin.gif] .

Your question was how to adjust the low end setting.
Here's the basics....keep in mind that you want the motor
to be set slightly rich on the low end. The reasons are....

1. Easier starting....remember that your engine does not
have a choke, or an enrichening device....a slightly rich
condition will help start the motor....and remember also
that the engine will lean out as it gets hot in flight....so again,
the slightly rich low end setting will help prevent overheating.

2. It will help prevent dead-sticks....that is to say, that when
you chop the throttle....say at the top of a climb....the slight extra richness will help keep the motor from dieing out.

3. When setting up for a landing....the extra richness will help keep the engine running. Hot engines sometimes die when
the throttle is chopped....the setting will help cool the motor down a bit....and like I tell my students....when you chop the throttle for landing....give it back two clicks of throttle, till
you get over the threshold to keep the engine running.

Here's how to set the low end. If when you advance the
throttle from idle....and the engine just dies out....like
someone turned off the ignition switch on your car....
just when you stepped on the gas....it's probably too lean.

On the other hand....if the motor starts sputtering, or
slobbering when you get to about 1/2 throttle, and dies
out after a few seconds....it's too rich. You might see some
mist coming out of the carb, and a lot of smoke from the exhaust.

If you turn the low end needle in (just like the main needle)
it will lean the mixture. Ultimately, you want to set the low
end, so the motor burbles ever so slightly when you advance
the throttle, (rich) but still transitions (goes into the higher settings) without dieing out.

You must keep in mind the high speed setting....because if
it is way too rich....it will make the transition overly sloppy....
and will throw you off. Set the main needle so the engine
goes to full scream. Turn the main needle in till the engine
starts to slow down (too lean) quickly open the needle so
the enginge doesn't die....and continue to open it until the
engine starts to slow down again....(too rich).

Now close the main needle 3 clicks. This will leave the high
speed set at a slightly rich full scream. Ultimately....the slightly rich setting, where the engine slowed down a bit is where
you will set the high speed....but for now, we don't want it rich....because it will throw off your low speed setting.

Whenever you make changes to the low speed needle, you should run the engine for about 10 seconds at full throttle.
This will "clean out" the motor....and give you a more
accurate reading on your low end settings.

There are different types of low speed needles....and
sometimes a carb can be improperly adjusted....so that it
is "out of balance"....that is to say, that the settings are so
far off, that proper adjustments cannot be made.

In most cases....to "start anew"....open the main needle
way out....about 5 turns. Turn the low speed needle in....
till it bottoms out....and then turn it out one full turn.

Now turn the main needle in till it bottoms out, and open
it two full turns. This should give you a good starting point
to set your adjustments.

Keep in mind....a proper glow plug....and proper fuel are paramount in getting any engine to run right....especially
in the fine tuning Dept.

I hope this helps you understand a bit more about your engine....and again I apologize for the "unhelpful" answer
you got.

The best thing about RCU is, that no matter what problem
you may have....there is someone out there with the correct answer....and they will be more than glad to help.

Enjoy RCU....it's the best site in the Universe....[sm=biggrin.gif]

Dave. ;)

RE: How do I adjust low end setting?
 

Thank you very much on the insight on my question. You have been most helpful!!! Its no big deal about the other reply I got. I shouldn't have took it to heart. Its bad enough to have a legitimate problem that needs an answer, only to get thT type of crap as a response. No bigie. Once again, thanks!:D