Sport_Pilot

Some of the Chinese engines are better than OS.  True ABC with good bearings, something OS doesn't have right now.  Maybe an OS has a better carb, but some of these Chinese engines are very close on that as well.  My only problem is that they come from a communist country.  So I prefer TT from Taiwan.

sheko_2000

LEO is Korian not Chinese

fiery

My Feedback: (2)

Sheko

LEO / INC is a Taiwanese company, FU YU TRADING Co. Ltd.

It is an automotive components manufacturer. Model engines are a sideline.

http://www.leoengines.com/engine/about/about.html

http://www.leoengines.com/engine/airCraft/list.html

RJConnet

Hi Sheko,

I have been running a LEO .46 for several years now and find it to be a very reliable good running engine. The performance is quite similar to the OS- SF which was a very popular engine a few years back and which it closely resembles if not copies.
I find mine is strong and reliable using a KB-1L glow plug and 10% fuel. The only problem I had with mine was with the O-ring on the low speed needle being a little loose allowing the needle to change positon in flight. Replacing the O-ring with a slightly thicker one cured that problem. The piston and liner are true ABC and the engine is wearing well. Not bad for 49 dollars.
Have fun with your LEO.........RJ [8D]

sheko_2000

thanks for the tip
but i don't really understand what is exactly "O-ring", "little loose allowing the needle to change positon in flight"

jeffie8696

Idid not know they even made engines smaller than a .40.

RJConnet

Sheko,
The O-ring is on the low-speed adjustment screw inside the carburator. Don't worry about it unless you have trouble with the low speed mixture changing. Normally they are a set it and forget it unless you have drastic weather or fuel changes. I'll try to attach a picture of the low speed adjustment screw with O-ring............RJ

sheko_2000

thanks

martin_solo

There has been some rumors here in Brazil that Leo Engines bought all the tooling, molds and tecnology from OS 22 years ago to start producing engines and that they are exact same as the OS SF long strong series.

Can any one confirm if this story is true?

Martin

Turk1

I dont recommend Leo engines only for they use conical bushing type keys for prop drive and it allows prop drive stick to put it friction upon crankcase when tighten the prop.We have to hammered one here to release then sanding the drive.Instead ASP engines great.

mikencharlie

Hi there - just acquired one of these engines in a de agostini spitfire. You say these are very reliable once set up - I have stripped and cleaned the carb,and put it back with settings as it came. Could I ask what needle settings you use (needle valve and idle screw) - mine fires but will not run. You could save me a lot of guess work . Thanks from Scotland.

Jim.Thompson

I have a new Leo engine. Mine has .40 stamped on one side of the block and .46 stamped on the other side!
How do I determine what size it is?
What size prop would suit it if it is .46 cu.in.?

1QwkSport2.5r

Measure the bore and stroke. Pi * R^2 * Stroke. Prop sizes can range - 10x6-8, 11x5-6, 12x4 or 12.25x3.75 for 3D.

I break in .40-.46 engines on a 9x6 APC way around 16,000rpm for a couple tanks of fuel then mount a 10x6 APC.

Jim.Thompson

Thanks, but I am hoping I don't have to remove the engine from the plane it is installed in, then strip it and measure up, reassemble and re-install it in the plane. I am hoping that there is still an easier way to solve this capacity question.

Mr Cox

It should be enough to take the head off and measure the bore and stroke. I guess the crank throw is the same on both anyway, so it would be enough to measure the bore (or the head part that goes into the liner if you prefer).

Jim.Thompson

That's true. Simple enough. Thanks.

jaka

Hi!
10x6, 10x7, 11x6, 12x4 for both .40 and .46 if you fly at sea level.

jeffie8696

You can install a 10X6 on just about any 40/46 size engine and it will fly just fine

Jim.Thompson

Thanks jaka and jeffie!

the pope

yep thats my go to prop for that size engine . Let it spin up

jeffie8696

Some engines respond to a prop that lets it spin up into the powerband, some dont, but its more common in my opinion for an engine to run better at higher rpm.