Information needed on MDS engines
11-15-2004 | 04:33 PM
#1
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From: Chemainus,
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Information needed on MDS engines
I picked up a Russian made MDS 25 on a trade, new in box, does anybody out there run them, are they any good ?? need to know BEFORE I put it in a plane Mike
11-15-2004 | 05:13 PM
#2
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RE: Information needed on MDS engines
You had best run it on the bench first and decide for yourself?
It might be the best engine you ever owned? ... and then again it may be a bunch of trouble?
They seemed to vary.
Everyone's habits and skills are different.
Enjoy,
Jim
It might be the best engine you ever owned? ... and then again it may be a bunch of trouble?
They seemed to vary.
Everyone's habits and skills are different.
Enjoy,
Jim
11-15-2004 | 09:09 PM
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From: WINDY,
KS
RE: Information needed on MDS engines
I have two,both .58's,one in a Cap and the other in a Giles 202,I love them both!
They do take about 1/2 gallon of fuel to break in though but very strong and VERY easy to start.
Oh by the way...mine have the newer C2 carbs on them too.
They do take about 1/2 gallon of fuel to break in though but very strong and VERY easy to start.
Oh by the way...mine have the newer C2 carbs on them too.
11-15-2004 | 10:40 PM
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From: Chemainus,
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RE: Information needed on MDS engines
Thanks guys, I always bench run them before instalation but I know from experience that bench running is one thing, staying running in the air is another!!!!! Murphys Law strikes too often, that is why I needed the input Mike
11-15-2004 | 11:39 PM
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From: Yuma Az,Balsam Lake,Wi.,
WI
RE: Information needed on MDS engines
Hi;Have heard all the horror stories about MDS's.Recently bought a used pl;ane with an MDS 68 in it in spite of my concerns it is as nice an engine as anyone could ask for.Starts easy idles good,screams when asked to!So couldn't ask for any more at any price!
11-16-2004 | 10:32 AM
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From: Chemainus,
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RE: Information needed on MDS engines
Thanks Moodier, I guess I will not know until I try it, like you .it will be no loss anyway, I traded for stuff that I did not need anymore Mike
11-24-2004 | 01:25 PM
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From: Chemainus,
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RE: Information needed on MDS engines
Update, I ran it through one tank, it started first flip and I did not even have to adjust the jets, took it for a flight, very quiet and powerfull,it seems like a very nice engine MIke
11-26-2004 | 02:04 AM
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From: Toluca, Edo de Mex.********, MEXICO
RE: Information needed on MDS engines
I have heard good and bad stories about these engines, but to tell you the truth, I bought 3, 48´s because they looked well made and I bought them with discount, but unfortunatelly this was the worst mistake I have ever done. All 3 of them are very unreliable, they burn plugs like woodsticks and you can never adjust the mid range RPM´s being too rich without leaning the idle to the point that they will stall any time. I have tested all of them in different airplanes and have had several dead sticks.
My advise is, if you want to keep your planes in one piece buy O.S. or Super Tigre, I have lots of these engines in different displacements, and never had a single problem with one.
By the way, ¡GET RID OF IT !
Good Luck.
My advise is, if you want to keep your planes in one piece buy O.S. or Super Tigre, I have lots of these engines in different displacements, and never had a single problem with one.
By the way, ¡GET RID OF IT !
Good Luck.
11-26-2004 | 07:15 AM
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RE: Information needed on MDS engines
NZ, all you need is a couple of Fox IdleBar GoldPost plugs and some 5% nitro fuel that is 20% lube of which50% is castor and they'll put your other choices to shame. Burning plugs means you were running them too lean.
11-26-2004 | 04:22 PM
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From: Toluca, Edo de Mex.********, MEXICO
RE: Information needed on MDS engines
Hobbsy,
I ´ll try what you suggest, but I really think it would be useless, I use Power Master 15% Nitro, 20% oil, all synthetic in all my engines even the Saitos an O.S.´s four strokes without problems, that is why I don´t understand why I had a hard time with this ones. Difference should not be that huge, I think.
Thanks.
I ´ll try what you suggest, but I really think it would be useless, I use Power Master 15% Nitro, 20% oil, all synthetic in all my engines even the Saitos an O.S.´s four strokes without problems, that is why I don´t understand why I had a hard time with this ones. Difference should not be that huge, I think.
Thanks.
11-26-2004 | 04:42 PM
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From: Toluca, Edo de Mex.********, MEXICO
RE: Information needed on MDS engines
I´ll rush today after work to the hobby shop for the plugs and the fuel, and I´ll try to test them this weekend. I´ll let you know the results later.
Thanks.
Thanks.
11-26-2004 | 05:59 PM
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From: Chemainus,
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RE: Information needed on MDS engines
Hmmm guess I am headed for trouble then,this 25 ran great on 10% fuels and a standard A3 plug, it was smooth and quite and idled right down, I must agree about OS I have some 70 engines of all sizes and 50% are OS MIke
11-26-2004 | 08:08 PM
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From: Chemainus,
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RE: Information needed on MDS engines
I fly multis and buy engines in sets of four, my first set was the early 25 Thunder Tigers, total loss, none of them would run properly, my next set were Pro Magnims, 3 were great, I am still using them , the 4th one never would run properly, the last set for my C130 are ASP 25 they have run, right out of the boxes with out a problem so you never know Mike
11-27-2004 | 09:08 AM
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From: Yuma Az,Balsam Lake,Wi.,
WI
RE: Information needed on MDS engines
HI;What is it with so many of these kind of engines such varied luck with them.I assume the design is OK but that only rarely do you get the one where everything fit properly.Like maybe complete lack of quality control??If you get that rare one you are happy!My 68 is wonderfu engine,friend literally threw away his 48 was so bad can't believe the way mine runs after his experiences!Maybe companies such as OS etc are more concerned over the quality,fit etc of there engines so have a more consistent product??Just thinking out loud!!
11-27-2004 | 09:55 AM
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From: Orchard park,
NY
RE: Information needed on MDS engines
ORIGINAL: nzhylb
I have heard good and bad stories about these engines, but to tell you the truth, I bought 3, 48´s because they looked well made and I bought them with discount, but unfortunatelly this was the worst mistake I have ever done. All 3 of them are very unreliable, they burn plugs like woodsticks and you can never adjust the mid range RPM´s being too rich without leaning the idle to the point that they will stall any time. I have tested all of them in different airplanes and have had several dead sticks.
My advise is, if you want to keep your planes in one piece buy O.S. or Super Tigre, I have lots of these engines in different displacements, and never had a single problem with one.
By the way, ¡GET RID OF IT !
Good Luck.
I have heard good and bad stories about these engines, but to tell you the truth, I bought 3, 48´s because they looked well made and I bought them with discount, but unfortunatelly this was the worst mistake I have ever done. All 3 of them are very unreliable, they burn plugs like woodsticks and you can never adjust the mid range RPM´s being too rich without leaning the idle to the point that they will stall any time. I have tested all of them in different airplanes and have had several dead sticks.
My advise is, if you want to keep your planes in one piece buy O.S. or Super Tigre, I have lots of these engines in different displacements, and never had a single problem with one.
By the way, ¡GET RID OF IT !
Good Luck.
11-27-2004 | 10:43 AM
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From: Orchard park,
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RE: Information needed on MDS engines
I spent several months on this. I tried all the nitro solutions and the plug solutions to no avail. The bearing solution costs nothing. So have an open mind on this.
The original thread is at
http://www.rcuniverse.com/forum/m_20..._1/key_/tm.htm
This applies to the 40 size engine as it is the only one I have any experience with. My 25s run fine. I have five of these 40 size engines. A guy with multiple 48s may wish to look at this no cost solution.
The original thread is at
http://www.rcuniverse.com/forum/m_20..._1/key_/tm.htm
This applies to the 40 size engine as it is the only one I have any experience with. My 25s run fine. I have five of these 40 size engines. A guy with multiple 48s may wish to look at this no cost solution.
11-27-2004 | 10:59 AM
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From: Orchard park,
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RE: Information needed on MDS engines
Nobody that doesn't own one of these troublesome MDS engines can understand the frustration they bring. I've been running engines since the 50's and was stopped in my tracks by the MDS's. These "my engine doesn't run" threads draw well meaning advice from helpful people who assume the poster is an incompetent beginner. Unfortunately the MDS engines are the problem not the owner as proven by the many posts on the subject and many people who reply that it is one of the best they own. Any disassembly of an MDS reveals they are of very good quality so that isn't the issue and that some run beautifully shows it can be done.
11-27-2004 | 11:01 AM
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From: Orchard park,
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RE: Information needed on MDS engines
The engines were repeatedly disassembled over the course of a couple months that I fought with them so that isn't it. The bearings were removed and reinstalled only once, the last time.
11-27-2004 | 11:05 AM
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RE: Information needed on MDS engines
I have about 12 MDS engines including two of the .40s that came on H9 Extra Easy Trainers, the only problem child was the .48 which was easily fixed as mentioned above. I have three 1.48s and two 2.18s and some other .58s, .68s and one .78 which I just converted to Diesel. One other thing I discovered with the .48 was that it ran much better with a 12x5 on it than a 10x6. It is a lot stronger than people think.
11-27-2004 | 11:38 AM
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From: Chemainus,
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RE: Information needed on MDS engines
Good stuff guys, I agree with Hobbsy, I am going to up prop the 25, I am running a 9/6 Master Airsrew , its reving pretty hgh on take off, whats a good top end rev 11,000 ?? MIke
