Dealspeed

My Feedback: (17)

So I know there's a few guys out there that know how to wake this little engine up, what are some of the simplest ways to accomplish this?
A old flying buddy of mine gave me back the very first glow engine I bought back in 2004, obviously a LA 25, I took it apart and cleaned it up, i decided to repaint it cause the blue looked pretty tired, the engine it self looks to be in very good shape so I figured I might as well use it.
If I can get a little power out of it that would be sweet.

Nitrovein

Your picture is flying inverted.

Hobbsy

My Feedback: (102)

I downloaded his photo and appears upright in My Pictures, but when I upload it back here it is once again inverted.

First things first though. Tell us how unpowerful it is.

1QwkSport2.5r

The thumbnail is upside down, but when viewed full size it's right side up.

Hobbsy

My Feedback: (102)

Hey Tim, good morning. My computer has it inverted both ways.

1QwkSport2.5r

Good morning, David. That surely is weird. It seems the upside down photos are usually uploaded from an iPhone. I've had it happen to some photos I've uploaded from my iPhone, but usually only the thumbnail is upside down and it doesn't do it every time.

I know admin is working on several forum bugs currently, so I'm sure with time the forum will be working well.

Dealspeed

My Feedback: (17)

When ever I post pictures with my phone (galaxy note 5) they are upside down, no idea why

GREG DOE

I clicked a second time on the inverted full size, and it turned it upright. Give it a try?

JPMacG

My Feedback: (2)

I'd say the simplest way to get more power is more nitromethane. Changing from 5% to 15% makes a difference, although not large. I don't know if you can go above 15 with the LA engines. You might need to install a head shim.

J330

My Feedback: (3)

Nothing about an LA 25 is fast. The easiest way to get more power;
Sell it.
Buy an FX25.

Simplest way anyhow.

123Cat

I didnt know they did a red it looks good

Nitro and a slightly smaller prop

is about it

maybe more compression ,

but that is fussy to do ,

lighter planes help a lot

Im running an iron piston 25 tomorrow and just made up a prop driver with brass weight in

down on the counterweight side , to see what happens
Ive got a 9x4 prop

1QwkSport2.5r

My LA .25 came with 3 head shims .4mm (.015") each. Add to that my engine has a total head spacing of .005" without any shims installed and I find it to have about .035" too much. I suspect this was done by a previous owner, but why so much I don't understand.

Im gonna see if I can equal or best the .25FSR in power and handling. I have a few different carb's of different sizes that will fit and do some other internal mods. Once I have a boost port cut into the case, I'll see how well it runs with a Brat/Bluebird .25 AAC piston/cylinder. The OS and Brat parts are almost identical in size and port layout. Lots of plans for Frankensteining a couple engines - even diesel conversions for some of them.

Dealspeed

My Feedback: (17)

I own two 25fx, there are guys out there who know how to really wake these motors up, that's why I asked.
was going to try the LA46 carb in it since it has a larger spray bar, might try a homemade tuned pipe as well, just want to have some fun with it.

Dealspeed

My Feedback: (17)

Actually this was a blue LA, the blue looked pretty bad so I stripped as much of the blue off as possible and then reshot it with a really high grade paint from where I work.

123Cat

Well done
I forgot you can use that high temp paint that they use for blocks , its a spray

Dont tempt me,,,,,, it looks good , a green would be good

Oh ,,, the head might be a problem , it gets quite hot ???

Dealspeed

My Feedback: (17)

It may be a problem, I sprayed the head as lightly as possible so hopefully it won't get to hot, I'll have it on the test stand very soon so I guess will see what happens

1QwkSport2.5r

Here's some LA25 food for thought. http://www.flyinglines.org/kb.la25rework.html and part II: http://www.flyinglines.org/kb.darkside.html

If you think that Red LA .25 looks cool, check out the "Batman" engine in the above links. They make a mean looking LA25.

J330

My Feedback: (3)

Not to argue with you, but these engines have no bottleneck in one area that cripples its potential.
To increase scavenging potential of any engine, the ENTIRE path from intake to exhaust, must be tuned and in sync with itself, or you get very little change that doesn't have significantly negative results to go with it, such as tuning or usable range of rpm. The engine is already balanced to it's current configuration of mediocrity.

1QwkSport2.5r

Exactly right. The first limiting factor is the channel within the crankshaft that the fuel must flow through. if the carb is bigger than the crank channel, you won't gain any power and probably lose some fuel economy.

buzzard bait

If you want to get into engine work, then fine, but for me it's all about matching power plant to airplane. On two and a half pound plane that is pretty clean it will give what most people would consider very good performance absolutely stock.

Dealspeed

My Feedback: (17)

You are very right buzzard.
the only time I actually ran this very engine was on a small funfly plane that was designed around the use of a AP 15 yellow jacket, the AP is very slow running for a 15 but also very lightweight.
the plane with the LA25 came in at just under 2 pounds, so with the LA25 powering it, it flew like a rocket, please keep in mind that this was my very first glow powered RC plane, everything I flew before this was powered by brushed electric motors with old school low discharge lipolys, so just about anything would have felt like a rocket to me at the time