critical! ignition timing.

[surfted]

What affects the ignition timing and how does it affect?

1. plug
2. compression
3. fuel blend
is there more factors?

can someone give me a good schedule over how to tune my engine with these things in mind?

Have I forgot something?

/T

[surfted]

I need to understand how these engines work to properly tune them.

I have a problem with my OS 61 Lx-h. I just can't get it to run smooth without getting hot. When it starts to run smooth the temp start to rise aswell.

I run 10% Nitro and 18% syntetic oil. I tried the enya 4 plug now but I use to have the enya 3 plug.

The heli is a fury basic.

What is the properly blend of fuel for this engine?
What plug do you suggest?

One thing that makes me confused is that I have to richen my low-mid screw almost all the way that's possible. I think it's strange. otherwise it starts to pre ignite.

:arggg:

[DavidH]

I have not used or helped anyone with an LX. But that engine is suppose to be user friendly.

Plug selection is OK. The Enya 4 or 3 should work great.

I don't know exactly what nitro content the LX was designed to run with. But with 10% you might be a little on the low side. The 10% nitro should not really affect how the motor runs, you would just not have as much power as higher nitro fuel.

You don't mention what brand fuel your using.

What exhaust do you have on the motor?
What size fuel tubing is being used to the motor.

Are you sure richening the low end screw and not leaning it?


David

[surfted]

I think it was suggested in the manual to use 0-5% nitro. Maybe this engine use more compression than other engines designed for more nitro.

I blend my own fuel. And I don't know the brand of the oil.. But they said that it should be a high quality fully syntetic oil.
The shop I bougth it from use this fuel for F3A I think.

The muffler is a Zimmerman.

fueltubings. I'm not sure but they do fit the engine and tank well. And the condition is good.

I'm pretty sure that I turn the low end screw the rigth way..
I turn it counterclockwise to richen it.

I read somewhere that the cooling on fury is pretty poor.. maybe it have something to do with it?

[DavidH]

The cooling system on the Fury is fine. MA has had the same cooling system for a few years. Not saying it is the best around. But it works fine cooling all the engines that I have seen and used with an MA heli.

I would look at something being wrong with the engine, or the fuel or exhaust that is being used.
Not been around any of the LX engines here in the USA. It was sold here as an inexpensive entry level 60 size engine. So I don't think there were many sold here in the US. A 60WC SX here in the USA was just about $40 more than the LX. So I would think most bought the SX,.

David

[Steve Campbell]

The 61 LX-H is a very user-friendly engine that runs just fine on medium-nitro fuel. I've worked with two of these engines, one in an X-Cell ST and the other in a JR Ergo 60 Sport, both on 15% Cool Power fuel.

Sounds to me like either you don't have enough oil in your home-brew fuel, or you have the high end needle too lean. The Enya #3 should be fine for your temperate climate; the #4 is a "cooler" plug and is useful for the higher temperatures/humidity here in the sub-tropics.

Remember that these types of carburetors key off of the high speed needle. In other words, you need to get the top end set right FIRST, then adjust the low-end for a good idle and mid-range. Every time you adjust the high speed needle, it will change the low-end mixture.

[conrod]

I'm backing Steve on this one.....HIGH Needle first, then low for hover & idle. Also, make sure that your throttle servo and linkage is right and all are moving. You should have around 5 deg. of pitch at hover. Checkout www.ronlund.com for tips on throttle servo setup.