what is the normal tempature

[giorgos93]

I am trying to set up the PRO-50H(R) engine and i dont no the right tempature to work the engine. Is there anyone to tell me what is the limit of this engine tempature. I mean i should make the mixture leaner until what tempature i dont no please help me. I must have the mixture too rich i think because i cant turn of the engine after landing. Is that correct i cant turn it of because is to rich? Please someone help me thanks.

[hawkman]

Ok.....the engine is switched off using the throttle control....your control might be leaving the throttle slightly open.....so adjust the linkage/servo travel...and throttle cut switch function (on your radio) until you can run the engine and switch it off....too rich a mixture shouldnt leave the engine running....a control that leaves the throttle slightly open will.

Temperature?

After flying the helicopter you should be able to land.....switch of the engine....and touch the backplate of the engine...it should be warm to the touch...but not hot...if its hot then you are too lean....if the backplate is cool then thats ok.....the mixture going through the crankcase keeps this part of the engine cool or warm.

Try this:

with the engine at idle....ticking over....take the fuel line....and pinch it about 3 or 4 cms back from the carb....if the engine increases its speed after 2 seconds then your mixture is ok....if it takes longer then you are too rich.
If there is rise in speed straight away...you are too lean...adjust untill you get the 2 second response.

MAKE SURE YOU KEEP A HOLD OF THE ROTOR WHILE DOING THIS....if you forget you can hurt yourself....the increase in speed is not much but it might engage the clutch...so be careful.

Rob

[giorgos93]

Thank you for your answer Rob. I have checked the throttle and the throttle cut from my transmitter and it close the throttle completly but the engine steel running.And if i do that with the fuel line and i have more then 2 seconds delay from wich screw i should make it leaner? The Mixture Metering Screw or the Needle Valve? When i should ticking the one and when the other? Thank for your time?

[hawkman]

Ok....the idle needle is sometimes inside the throttel barrel...look carefully and you will find it...screw in to make the mixture lean...screw out to make the mixture rich.

The large needle is the 'main needle' which can only be adjusted from half power all the way to maximum power.

So....if you pinch the fuel line...and 2 seconds later the engine increase in revs the mixture is ok....if the revs increase straightaway then take the idle needle out a 1/4 turn....dont move the screw too much....small adjustments are all thats needed.

If the revs increase after 3 seconds then screw the idle in a little bit....until you get that 2 second delay.

The main needle is set:

hovering...go up...if the engine starts to splutter and die then you might be too rich.....screw the main needle in a little bit....repeat the test...if the engine has a lot of power but it dies out without spluttering then you might be too lean....land and adjust the main needle...take it out a little bit.

You want power without hesitation.....if you have smoke and oil coming out of the muffler then thats good.


Rob

[giorgos93]

Hello again Rob. I have made those things and the mixture was ok thanks a lot.Byt i still have problems to turn the engine of.I have ckeked the carburetor and is closing completly. Yesterday after landing i had turn the throttle cut on the carburetor was copletly closed and the Raptor engine was still running at idle for about 10 minutes.I had to go home and i pinch the fuel line and hold it there while holding the blades to make it turn off.I had burned my finger to many times with the exhaust pipe, thats why i did it like this.What can i do please help me.Is that normal?I have an airoplane too but i have never had that problem with engines?I have some friends with Raptors but those engines stop running the minute they swich on the throttle cut.And in the two of them i have set up the throttle cut my self,i mean i no how to turn the engine off.I dont no what else to do.Thank for your time Rob.

[chaos]

It can't run without fuel and air. It has to **** air past a place where it can **** fuel. I can't find a drawing of that carburetor. Are you absolutely positively sure the carb is ALL the way closed? Does it have a throttle stop? Maybe it's defective. I think the carb has to be the problem.

Unhook the ball at the servo end of the throttle linkage so that you can move the pushrod by hand. Move the pushrod to close the throttle all the way.. go as far as it goes. Then see if the servo end of the link matches the servo position when you go to cut-off. If the servo is actually pushing the throttle arm all the way to cutoff, pull the engine and see if that position actually closes off the carb hole fully. There might be a flake of metal that's preventing the thing from closing off completely.

[mgarciah]

Im using a .91 TT engine, my mixture is really rich, it even take some time for the engine to rev up, (lots of smoke) after a 2 minutes hover I read on my temp gauge 114 celcius, the temp probe is installed just below the head of the piston. the muffler was really hot but the backplate was warm and touchable, this means that you have a bunch of different temps around.

I think temp gauges wont tell you much, it is a matter of test and error, you will know your engine with use, so I think you can spot some trouble after a while with the temp gauge.

Good luck.

[3dee]

Hi, if you can fly or hover for a few mins then land, stop the blades and then quickly touch the back plate and its warm but touchable you are fine if its too hot but the engine throttle is quick and smooth use more nitro in the fuel. If its has not got a good throttle then sort out the carb setting first then try the temp test