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Ys200s

Old 01-04-2021, 10:56 PM
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FBW
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Default Ys200s

Hi all,

Has anyone had a failure of the Conrod big end bearing on one of these engines?

Is the factory aware of the issue and is anything been done ?

Many Thanks
Old 01-07-2021, 06:09 PM
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drac1
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Originally Posted by FBW View Post
Hi all,

Has anyone had a failure of the Conrod big end bearing on one of these engines?

Is the factory aware of the issue and is anything been done ?

Many Thanks
Yep, my 200S did the same.

Big end failures are nothing new. All the DZ engines have had a failure somewhere, sometime, it's not only the 200S.

My first 170 did. I've been using YS for 20 years with 1000's of flights and only had the 2 failures, so that's not too bad.
Old 01-07-2021, 06:19 PM
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Originally Posted by drac1 View Post
Yep, my 200S did the same.

Big end failures are nothing new. All the DZ engines have had a failure somewhere, sometime, it's not only the 200S.

My first 170 did. I've been using YS for 20 years with 1000's of flights and only had the 2 failures, so that's not too bad.
Thanks drac1,
Do you think its oil content / quality related?
Old 01-07-2021, 06:39 PM
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Originally Posted by FBW View Post
Thanks drac1,
Do you think its oil content / quality related?
I doubt it's oil content related.

From the 170 onwards, all my engines are cdi and I've always used 10% oil. If it was oil %, I would have had more than the 2 failures.

If anything, I would say it may be that the bearing was a bit tight? But that's only a theory.

Previously, I've run a couple of tanks through on the test stand. Now I give the engine a really good break in with the break in needle open. I run at least 2 litres through at a very rich setting on the test stand, then close the break in needle and fly it.

It would be interesting to know what factory clearance should be, but not much chance of finding that out. Lol.

Last edited by drac1; 01-07-2021 at 06:41 PM.
Old 01-07-2021, 11:28 PM
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I brake in my engines using 20 % oil and the valve open for 3-4 tanks on the ground with a very rich mixture ......3-4 turns out.
I occasionally check the temperature and don't allow more than 40 deg C during the break in process.

Once I run a tankful through I lean the engine and advance the throttle up but not maximum rpm.I then richen the mixture and keep the process for the next 3 tankful.

When I am happy that the engine responds and transitions I close the valve ....not fully and lean the high speed to about 1 1/2 turns .
At this point I fly the engine and change the fuel to 10% multi viscosity CP and 30 % Nitro.

I always check the engine and regulator temperature after each flight ......I get around 30-40 deg C in the winter and a little higher during hot weather ops.
If I get a high reading I richen the engine ....only one click is enough on the high speed.

I keep the break in valve a little open for at least 40-50 flights .





Old 01-08-2021, 12:09 AM
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Originally Posted by FBW View Post
I brake in my engines using 20 % oil and the valve open for 3-4 tanks on the ground with a very rich mixture ......3-4 turns out.
I occasionally check the temperature and don't allow more than 40 deg C during the break in process.

Once I run a tankful through I lean the engine and advance the throttle up but not maximum rpm.I then richen the mixture and keep the process for the next 3 tankful.

When I am happy that the engine responds and transitions I close the valve ....not fully and lean the high speed to about 1 1/2 turns .
At this point I fly the engine and change the fuel to 10% multi viscosity CP and 30 % Nitro.

I always check the engine and regulator temperature after each flight ......I get around 30-40 deg C in the winter and a little higher during hot weather ops.
If I get a high reading I richen the engine ....only one click is enough on the high speed.

I keep the break in valve a little open for at least 40-50 flights .
That also indicates to me it isn't a oil % problem.

Just one of those things 😬
Old 01-13-2021, 12:48 PM
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I do beleive is break in needle valve and oil related, I did the same as FBW, broke in the engine with 23% oil, but 2.5Lts of fuel, then break in needle still open fly.
I have to try the YS fuel I got when weather colaborates, and that has 10% oil, that´s why I burned so much 23% first. I have seen the same issue with a 185 Red that had the break in needle valve closed, and failed around 40 flights, as I investigated the motor, found the bushing rotated due to heat closing the lubrication orifice causing it to melt on the cranckshaft pin.

Will see how mine does on low oil.
Old 01-13-2021, 02:15 PM
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Originally Posted by apereira View Post
I do beleive is break in needle valve and oil related, I did the same as FBW, broke in the engine with 23% oil, but 2.5Lts of fuel, then break in needle still open fly.
I have to try the YS fuel I got when weather colaborates, and that has 10% oil, that´s why I burned so much 23% first. I have seen the same issue with a 185 Red that had the break in needle valve closed, and failed around 40 flights, as I investigated the motor, found the bushing rotated due to heat closing the lubrication orifice causing it to melt on the cranckshaft pin.

Will see how mine does on low oil.
I've always run 10% oil, for break in and flying. I fully close the break in needle after bench running for break in.
If it was oil % related, I would think I would have had more than 2 failures in around 10 years and 1000's of flights.
Old 01-13-2021, 02:22 PM
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Yes, but if it doesn´t fail on the first flights I do not think it will fail at all, that´s why I think is a problem only during break in, and engine with 100 flights will not have this failure unles is too lean, and actually, the bushing that failed was kind of silver in color not bronze, when I reported back to Richard on the findings, he said the conecting rod was the same, so I was never able to figure out the color change, unless heat?

Last edited by apereira; 01-13-2021 at 02:26 PM.
Old 01-13-2021, 02:39 PM
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Originally Posted by apereira View Post
Yes, but if it doesn´t fail on the first flights I do not think it will fail at all, that´s why I think is a problem only during break in, and engine with 100 flights will not have this failure unles is too lean, and actually, the bushing that failed was kind of silver in color not bronze, when I reported back to Richard on the findings, he said the conecting rod was the same, so I was never able to figure out the color change, unless heat?
I agree that if it does not fail early it will be OK.

My theory is that occasionally the clearance may be a bit tight.
Old 01-13-2021, 02:44 PM
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Originally Posted by drac1 View Post
I agree that if it does not fail early it will be OK.

My theory is that occasionally the clearance may be a bit tight.
I might check mine now that we even have snow and most roads are closed, I will compare to my 185’s as it is the same conrod.

I’ll let you know what I find.
Old 01-13-2021, 02:45 PM
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Originally Posted by apereira View Post
i might check mine now that we even have snow and most roads are closed, i will compare to my 185’s as it is the same conrod.

I’ll let you know what i find.
ok 🙂
Old 01-14-2021, 11:09 PM
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Just as a matter of interest how many flights did you have on your 200S before the failure ? And what temperatures do you get after flight ?

Also probably not related but has anyone noticed that the front bearing is now different on the 200S........

kind regards
Old 01-15-2021, 12:10 AM
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Originally Posted by FBW View Post
Just as a matter of interest how many flights did you have on your 200S before the failure ? And what temperatures do you get after flight ?

Also probably not related but has anyone noticed that the front bearing is now different on the 200S........

kind regards
The 200 and 200S have a different front bearing part number to the previous engines.

From what I can tell, it's the seals that are different.

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