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OS46 AX Overheating?

Old 04-02-2005, 06:58 AM
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biggles71
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Default OS46 AX Overheating?

Hi there,

My OS46AX engine, keeps on giving me trouble....


The engine has been flying about 8 to 10 hours now as has been run in.

I did 4 flights yesterday without too much hassle... except that it was a bit hard to start.

Today, I fired it up (again difficult to start), and all was looking good.

After take-off, about 2 mins in the flight, the engine looses power. It develops less than 1/3 power, even with the throttle wide open.
I had this 2 or 3 times today. Each time I managed to land my super sport 40S without damage.

Immediately after landing the engine feels very hot. Too hot to touch. The outside temp was about 90F/35C.
I use Coolpower 10% since the beginning with this engine.

Could this be a sign of overheating...? If so, what can be done...?


My Super Sport, has a cowling, but this has not been installed yet.
The engine was involved in a crash lately on another aircraft. I opened it, check the carbu and took the backplate and the cylinder head of, all looked fine.


Hope to have some feedback from you guys.


Thanks and Brgds,

Biggles71[]
Old 04-02-2005, 10:57 AM
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Flyboy Dave
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Default RE: OS46 AX Overheating?

Yes, it is over heating. Get some fuel with a castor blend, and you will see
how much cooler and better the engine runs. Usually....running the engine
the way you described.....over heating like that.....about three flights like
that, and the engine will be shot. []

If you can get some castor, you can add it to the synthetic fuel.

FBD.
Old 04-02-2005, 11:11 AM
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BARCC
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Default RE: OS46 AX Overheating?

I say RICHEN her up boy!!!!
Old 04-02-2005, 11:13 AM
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Pepe J
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Default RE: OS46 AX Overheating?

You didn't mention what Size prop. you are trying to swing? An 11 x 6 would probably be a good choice for that plane/engine combo.
Old 04-02-2005, 03:00 PM
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pelham
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Default RE: OS46 AX Overheating?

It sounds like it's too lean. Open the needle a quarter turn and see if that helps.
Old 04-02-2005, 03:20 PM
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biggles71
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Default RE: OS46 AX Overheating?

Yes the prop is an 11x6.

I'm pretty confident that the mixture is not too lean... and yes, I have opened the needle valve even further, to no joy.

There must be another reason for the overheating. It also seems to go quick through new glowplugs. I used several heatings, A3, A5, nr 8, Fox...


What fuel do you guys recommend for the conditions above?


All input more than welcome, since I don't want to damage the engine even more.



Thanks and Brgds,

Biggles71
Old 04-02-2005, 03:38 PM
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Pepe J
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Default RE: OS46 AX Overheating?

Try a fuel blend with a 20% oil content. 25% castor, 75% synthetic. 10-15% Nitro. and a #8 plug. You'll just have to richen things up to compensate for the 35C temp.
Old 04-02-2005, 04:01 PM
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Default RE: OS46 AX Overheating?

Hi!
You sure is running the engine too hot! Either you set the highspeed needle to lean or you you use to much nitro!
Perfect fuel for all engines is 5%-10% nitro! No more is needed.
A good size Propeller for general sportflying is a 11x6...preferable a APC.
You should also use a OS 8 or a Enya 3 glowplug.
When you have started the engine... hold the nose of your airplane straight up for about 10 seconds. If the engine could hold the setting at this position everything is probably fine and you could fly.If not open the highspeed needle somewhat (like half a turn) and try again.
Do not ever take off without having done this test!!!
Regards!
Jan K
Sweden
Old 04-02-2005, 08:24 PM
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downunder
 
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Default RE: OS46 AX Overheating?

If I read this right the problem only started after the head and backplate were removed. My first thought is that the head wasn't tightened progressively and evenly and is either leaking or it's warped the liner. I'd check for leaks on the backplate too.
Old 04-02-2005, 09:35 PM
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trentos
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Default RE: OS46 AX Overheating?

i think u shoold richen it up on the bottom end needle. srew it in to let less air in, in the mixture.

as uve probli herd it is safer to have it richer then leaner, ive had a few of my motors seize up due to to lean.

trent
Old 04-02-2005, 10:12 PM
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Default RE: OS46 AX Overheating?

Huh?
Old 04-03-2005, 12:59 AM
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Default RE: OS46 AX Overheating?

Biggles,


I second FBD.

USE FUEL WITH CASTOR OIL, NOT ALL SYNTHETIC GARBAGE!


My old .40FP did this just before it peeled its ABN sleeve, on 5% CoolPower....
When I still did not know what I was doing...

OS tell you to use Castor oil in ABN engines, so just do it!
Old 04-03-2005, 06:13 AM
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jaka
 
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Default RE: OS46 AX Overheating?

Hi!
Come on Dar!
There is no problem of using all synthetic oil in our engines! Its just a matter how you set the engine...knowhow! You know.
Regards!
Jan K
Sweden
Old 04-03-2005, 06:44 AM
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DarZeelon
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Default RE: OS46 AX Overheating?

Jan,


You have plenty of experience using Motul Micro and Sachs Aerosynth II/Aerosave synthetics, that are as slick, if not slicker than Castor oil (yet still have a significant lower flash-point).

They are so slick that Webra tells the owner not to use them and to use Castor, or a break-in synthetic oil instead, to perform the break-in in their engines (also ABN).

Unfortunately, these higher quality synthetic oils are not available in North America, so over 90% of the readers of these posts can only be mis-guided into using the locally available synthetics, that may eventually harm their engines.

They simply don't work nearly as well as the synthetics you are acquainted with.

Klotz rate their KL-100 synthetic's slickness as 5, with their BeNOL Castor oil getting a solid 10.
Old 04-03-2005, 01:55 PM
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jaka
 
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Default RE: OS46 AX Overheating?

Hi!
Well! I don't think that Klotz synthetic oil or whatever the fuel companies in the USA use could be that bad...?!

Regards!
Jan K
Old 04-03-2005, 02:25 PM
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DarZeelon
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Default RE: OS46 AX Overheating?

Jan,


I proudly use BeNOL, which I buy from Klotz's Israeli dealer, but after reading their own specifications, I doubt I will ever use their straight synthetic... Hey, is this becoming another "Last Words on Castor" thread???

Help, Bill Robinson!
Old 04-03-2005, 02:40 PM
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Spicoli
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Default RE: OS46 AX Overheating?

Dar,
Coolpower is one of the most popular fuels in North America.It will not overheat a OS46.
Old 04-03-2005, 02:40 PM
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Default RE: OS46 AX Overheating?

Hi!
Hell NO! I'll stop here....
Jan K
Old 04-03-2005, 03:11 PM
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Default RE: OS46 AX Overheating?

Kelly,


Please read this:


...You should also use a fuel that contains castor oil in the lubrication mix. Castor oil helps the engine run well and is the better lubricant for our ABN engines. All-synthetic fuels have been known to cause difficulties in running at times.
...

And the whole [link=http://www.osengines.com/faq/product-faq.html#q2]break-in Q&A[/link].

Even if everybody uses CoolPower, could it just be that everybody is wrong???

It sure could!

Morgan specifically recommend the Omega Castor/synthetic mix fuel for all ABC/ABN engines (and CoolPower for ringed engines).
So it is not the fuel manufacturer who happens to be a few marbles short...
Old 04-03-2005, 06:09 PM
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Flyboy Dave
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Default RE: OS46 AX Overheating?

You Guys can rave about the straight synthetics all you want, one thing you
will never do is duplicate the "show-off routine" I do all the time....typically
with my K&B .61's running on 15% PowerMaster fuel containing fully 1/3
castor bean oil in the blend of 18% oil. I don't do this to show-off the fuel,
but to show how cool the K&B's can run....and keep in mind the K&B's
.61's have hardly any fins on them to speak of.

I'll land the plane....taxi it over to me....kill the engine with the trim tab....
turn off the transmitter and receiver switches....then grab and pick up the plane
by the cylinder, and carry it to my pit. [X(]

That's one thing you will not be doing with a straight synthetic oil. The reason....

....the engines run much, much cooler on the castor blends. They smell much
nicer too.

FBD.

Old 04-03-2005, 08:19 PM
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warhwk
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Default RE: OS46 AX Overheating?

If you are going through Glow Plugs, the engine may already have been damaged and shedding metal particles.
Old 04-04-2005, 01:47 AM
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biggles71
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Default RE: OS46 AX Overheating?

Thanks Warhwk....

I'm in New Zealand now, away for work (airline pilot), will take off the cylinder head again when I'm back in 5days and check if I can see something.

What would "you" do Warhwk?

If you say, engine damaged.... would this mean buying a new engine, or replacing parts?


Thanks,

Brgds,

Biggles
Old 04-04-2005, 10:17 AM
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Pepe J
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Default RE: OS46 AX Overheating?

OK boys, lets put the synthetic bean oil debate aside and start on the OS liners peeling. I personally have yet to see a peeled OS liner? Maybe we get all the good ones here in Canada? What are the symptoms when a liner starts to go south? I can see an excessive use of glow plugs being one. Is overheating one of them or is that the cause?
Old 04-04-2005, 01:59 PM
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biggles71
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Default RE: OS46 AX Overheating?

Pepe J, I think you are steering in the right direction....

Now, I realize, that when I opened the cylinder head, there was a tiny bit of liner visible... At least that's what I think it was, tiny spot that is gold coloured, and one could feel a small sticky bit with your nails. Because it was high up in the cylinder, close to the TDC, I did'nt worry too much about it.

Most probably, it will proove to be a wrong decision of me, to continue flying the engine.


If it is the liner,.... can I still save the engine by replacing some parts....?
\
If yes, please explain what the job is like, and how expensive it is, compared to buying a new engine.

Once again, I'm away from home on on airline job ( in Australia now), and will only be home in 5 days or so. Can't wait to open the engine...


Hope to receive some more comments on OS engine liner problems,


Biggles
Old 04-04-2005, 02:15 PM
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Pepe J
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Default RE: OS46 AX Overheating?

If it is the problem, I would say you would need a new liner and piston. O.S. parts are pretty $$ no matter what part of the world you live in. Do you still have a warranty?
Like I mentioned, I've yet to see one, just the pic's and complaints here at RCU. We'll have to let one of the "experienced" members answer that question. I know people you fly in the dry, dusty conditions are experiencing more of the liner peeling problems than people in other, more favorable conditions.
May be post a picture when you tear it down again?

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