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RE: Are OS 4S engines that bad? - 9/1/2007 4:18 AM   
TimC



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ORIGINAL: quepasa

Ever hear of anyone comparing an OS to anything else?
Doubt it!
I think all the others are compared to OS! Some are better in some applications, but most are not, and none are better overall.
O.S. is the sounding-board for everyone else. That in itself oughta tell a guy something.

You have something there quepasa. I think I've seen every brand of engine compared to the equivalent size O.S. here at RCU. Almost every other brand has been trumpeted as being much stronger than an O.S. I guess those of us who are satisfied with and enjoy owning an O.S. are pretty stupid, huh?

< Message edited by TimC -- 9/1/2007 4:19 AM >

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RE: Are OS 4S engines that bad? - 9/1/2007 9:51 AM   
duke



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ORIGINAL: Ed Cregger


quote:

ORIGINAL: alfredbmor

In a small RCuniverse research, visiting some related forums, found that the most popular 4 stroke engines are Saito (Look at the number of visits of the Club), Os, YS and Magnum. Tha fact is that in percentage more OS 4 stroke users have more problems or issues with their engines than Saitos, YS and magnum. I was about to buy a new engine to replace a very well used Saito 91, but I was in doubt on the brands:
Saito 125=Reliable lack of fine power
YS 110=Too much power some tunning issues
OS 120=Too heavy and lack of power.
Magnum 120+ Same as OS?
What do you guys think on these engines and the complete line of engines?




-----------------


My experience has been that OS four-strokes have been at the top of the heap as far as reliability and power are concerned. I haven't seen the OS engines I have being any less powerful than any other non YS four-stroke. In fact, sometimes I have seen just the opposite.

I've never had an OS four-stroke engine swallow a valve or ruin a piston and liner. I've especially never had a problem with camshaft wear, requiring a replacement. Some other brands cannot make the same claims. Magnums, while nice clones of OS, haven't been quite as powerful as the OS engines they have copied. Close enough, but not as powerful. This can vary from one engine to another. It is even likely that one or two Magnum engines could even produce more power than the original from which they were copied from, but I've only heard of this happening. I haven't witnessed it myself. No other engine brand handles as well as my OS four-strokes - even Enyas aren't that user friendly.

RCU engine forums seem to be very heavily biased toward favoring one particular brand of engine. I do not see this bias as being universal throughout the modeling community.

If OS engines were truly as bad as some seem to imply, why would their be a company in China whose business is making clones of OS engines? Don't believe everything that you read.

I own just about every brand of engine that I can get my hands on, including OS. Each brand seems to have its pluses and minuses. When weight and size are not a problem in a particular model, I always reach for the OS engine. To me, they are as close to set and forget as four-strokes come. The ball bearings seem to last nearly forever (glow plugs too) with just a minimum amount of maintenance being applied.

I opt for Saito when I'm looking for the lightest, smallest engine that has good reliability.

Sanye engines can sub for OS in most cases.

Enya engines are my "babies", if you know what I mean? I appreciate the fine workmanship of these engines. Unfortunately, Enya hasn't stayed with the competition in offering enough sizes for many of my models. I have taken to buying used .60 - .80 Enyas and building better ones from the best of the parts.

I even have YS engines from time to time. My current YS engine is an old .60 short stroke roundhead. A screamer from the distant past. What a .60! <G>


Ed Cregger




...it all comes down to reliability and durability and ability as a hobbiest to maintain your engines...as I love glow engines....and your right OS has some good internals..and the older OS's were magic...but not any more..they're cutting corners where they shouldn't and they won't be able to ride on the coat tails of their past much longer.......just buy a pumped 4 Stroke and wait till you need replacement parts for that plastic pump system...as it goes for needle valves that break at the slightest pressure and plastic back plates that leak...both now common on many OS engines.....

< Message edited by duke -- 9/1/2007 9:53 AM >

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RE: Are OS 4S engines that bad? - 9/1/2007 9:55 AM   
duke



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RE: Are OS 4S engines that bad? - 9/1/2007 10:02 AM   
duke



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ORIGINAL: the pope

hey Duke dont take offence but why is it that other manufactures can have only four head bolts and nobody could care less but when os does it the ****e hits the fan?Also if saito has no bronze bushes for the con rod its a engineering marvel yet when os heads in that direction there just getting cheap. I would hate to see the reaction if a fix for a leaky intake on a os was to wire it back on with a bit of wire yet if it happens on a saito thats ok (saito 72} also not to mention bearings going south quike smart.For what its worth I have both saito and os four strokes and like them both. Cheers the pope


No offense.....net is what it is....

they used going to four bolts as a marketing point...that's what I was saying....now if someone would kindly tell me the benefits of having less torque points on a head please advise...cause I'm no engineer. Sure isn't clear in their ad's how it was a benefit...besides the seemingly obvious less cost..course again I could be wrong. And again biggest beef .. the PLASTIC!



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RE: Are OS 4S engines that bad? - 9/1/2007 6:19 PM   
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Status: offline 		Four bolts, and a flimsy plastic backplate never bothered Saito.



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RE: Are OS 4S engines that bad? - 9/2/2007 1:00 AM   
Rate1



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Status: offline 		I get to the field and my OS 120 Surpass3 pumped just starts right up everytime, it is the maintenace free usage, fuel economi, not having to fiddle while at the field, as well as real Good power considering 15% fuel...oh it is also easy, quick and hustle free to break in an OS.
With this experience I selected the OS200FS as my next engine.

Decide what you want from your engine and pick one accordingly. As said, there is one for each use and personality.
...so wich one are you?

< Message edited by Rate1 -- 9/2/2007 1:04 AM >

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RE: Are OS 4S engines that bad? - 9/2/2007 10:14 PM   
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Status: offline 		Ok here it goes! I stated in another post that i've been flying rc for over 30 hyears,and have over 40 four strokes. This may not qualify me as an exspert on them,but i think it allows me a good range of leaway on my ideas of what's good and bad. First off,i'll list all my 4's from BEST to WORSE with and explanation behind each 4 stroke manufacture listed.

YS == ONE 63 (OLDER VERSION),3-91ac's,3-120ac's,1-120nc,1-120fz,ans last but not least my 140fz.

These are THE top of the line 4 strokes PERIOD! You fallow the instructions for setting them up exactly,and no so called (finniky adjustment problems at all)

OS == 1-26 surpass,1-48 surpass,1-52 surpass,2-70 surpasses,4-91 surpasses,2-120 surpasses (original versions )1-120 surpassII

Very reliable on any nitro from 10 to 20%,exellent power,and run forever with hardly no adjustments.

Saito == 1-56,1-72,1-120 older verson

I no longer have the 120 engine as i sold it in the plane,but it ran flawlessly for over 10 years with only valve adjustments done every year befor the flying season began. The 56 and 72 are both fine running engines and are great for the smaller light weight planes they are in.

Enya == 1-53,1-80,1-120

Very fine engines,with only 2 draw backs. First was air bleed carbs,and second was forward facing glow plugs. They do however come with the glow plug remote adapter to move it to the motors side mounts.

Magnum == 1-91

Smooth running motor,reliable and cheaply priced.

ASP == 2-80's

Both are fine running engines as long as you change one thing on them. You completely replace the stock rocker arm assembly with one from a OS 91 Surpass. The factory ASP's rocker assembly is Very prone to breaking in half where the center hold down bolt it.

TT == 1-91

Basically the same as the magnums,but a bit lighter in weight.


Avitar == 120

A good conversation piece,but not much more. They have a very bad habbit of throwing the timing belt and getting parts are rare!


Ok,i was mistaken,i only have 32 four strokes just now. But as stated in earlier posts,they all have the good point and bad. But from my own personal exsperiance,the list above is how i'd rate them as from best to worse.


Good Flying,and i hope this information help's someone out!

Art

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RE: Are OS 4S engines that bad? - 9/2/2007 11:13 PM   
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TT == 1-91

Basically the same as the magnums,but a bit lighter in weight.


Are you sure about this? A Magnum 91 fs weighs 640 grams, muffler included (basically identical to an OS 91) and I know that the TT 91 fs is one of the heaviest 91`s around at something over 700 grams, thus making it less popular as opposed to other brands

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RE: Are OS 4S engines that bad? - 9/5/2007 10:50 PM   
abacro


 

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Status: offline 		my TT 91 with muffler weighs in at 638 gram according to my gram scale,and the magnum comes in at 641,with my OS's running between 640 and 645,my scale might be off,but it cant be off by over almost 65 grams! And yes if u read the TT manual,it even says iot weigh's over 700 gram's,but mine don't. Mawbe it was a miss pring by TT!



Good Flying

Art


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RE: Are OS 4S engines that bad? - 9/5/2007 11:52 PM   
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Status: offline 		That is really strange I have read several times here on the forums that the TT 91 FS is a very heavy engine, well maybe it isn`t so, alot of people actually believe OS when they claim that the OS 91 FX weighs 550 grams, when in reality it weighs 770 grams. One never know until one put the engine on a scale

< Message edited by asmund -- 9/5/2007 11:53 PM >

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RE: Are OS 4S engines that bad? - 9/6/2007 12:25 AM   
asmund


 

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Status: offline 		Hmm, this made me very courious. If the TT 91 fs really is that light it have gotten a undeserved bad reputation for beeing a heavy pig. I have Googled and Yahooed but came up emtyhanded. If that engine really is that light I might be tempted to get one for myself, you just don`t see many of those around. Can anyone confirm that Abacro`s scale is working properly???

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RE: Are OS 4S engines that bad? - 9/6/2007 1:57 AM   
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Status: offline 		Interesting thread. But, while you all are belly-aching about which one is better and how many of these and this many of those, I'll be out flying my 4-strokes. That's right, my Saitos, my OSs and all. Flying, remember, that's what they were built for. You can learn a lot from these forums but I've got to think that there's a time when it all comes down to knowing when to cut bait and get in the air. I'll be at the field if anyone needs me. Lemme know who eventually wins the popularity contest.

Sorry, had a bad week.

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RE: Are OS 4S engines that bad? - 2/19/2009 8:30 AM   
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Status: offline 		NO. They are just fine, so are my Enya's, and many, many Saito's. This is a hobby, to me, my hobby.I work to buy toys and enjoyment. Buy an O.S. enjoy it. Run it a lot,(break it in on the ground, not into the ground) as with all 4 strokes,run a little rich,good amount of oil,enjoy it.
Again it is your hobby, your choice.See you at the field, wherever it is.

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RE: Are OS 4S engines that bad? - 2/19/2009 9:19 PM   
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Status: offline 		Hello; I had the entire
Surpass line from 26 to 120 when they had that "I" designation. They were great engines all of them, no complaints at all with any of them, all started, ran and flew great. I still have 4 26's a 48, 2 70's, I sold the 91 and the 120, but they were fine too. I have nearly the entine Saito line now from 30, 40, 3 45's and an 45S, 2 50's a 56, 4 80's 2 91's a 100, a 100 twin and a 120S. I also have a lot of Enya's; 4 46's, 280's and a bunch of two strokes. They are all good, reliable engines. If I'm asked which engines I prefer, I always say Saito. I prefer their design, using fewer parts then all the others, the one piece head/barrel is more expensive to produce but provides a trouble free head seal.

An engine is just a tool, either it soes the job or not, if not then it gets replaced. I'm not so fussy what the name on the side is, as long as it does the job. If I could buy an OS engine for a price similar to all the others, I would, but they have raised their prices right out of the reach of a lot of modelers. I stopped buying OS because any parts I had to buy had a $35 "brokerage fee" added to the price just to get it through the border. Who needs that?

There will always be a percentage of people who think it's important to have "the best" and to lord it above others who have had good performance from lesser brands. There will also always be some who will argue against the established brands after finding a cheaper substitute that worked for them.. That's fine, they;re just engines!

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RE: Are OS 4S engines that bad? - 2/20/2009 12:13 AM   
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Status: offline 		I only own one (OS FS-90) four stroke and have never used it in a model....

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RE: Are OS 4S engines that bad? - 2/20/2009 12:25 AM   
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Status: offline 		The TT is heavy, the weight on the Ace Hobbies site is accurate but a bit on the heavy side. Mine weighs something like a 1/8 th of an ounce less with muffler. But at the time the Ace site did not say it was with muffler and OS gave their engine weight without muffler so it is not as heavy as it would seem, about an ounce heavier than the OS without the muffler. and a littles less than an ounce with the muffler. So it is heavy, but not heavy enough to be called a pig. And it performes more like a an angry bull!

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RE: Are OS 4S engines that bad? - 2/20/2009 12:27 AM   
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I guess those of us who are satisfied with and enjoy owning an O.S. are pretty stupid, huh?


You said it! Not I!


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RE: Are OS 4S engines that bad? - 2/20/2009 12:55 AM   
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Status: offline 		It's not clear to me at all why this thread was revived

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RE: Are OS 4S engines that bad? - 2/20/2009 1:35 AM   
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RE: Are OS 4S engines that bad? - 2/20/2009 2:01 AM   
Ram Jet



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ORIGINAL: Bone

It's not clear to me at all why this thread was revived



Me either. Three things I don't like to post about:

1. Which engine brand is better
2. The optimum fuel mix
3. Proper break in procedures.

It's fun to read this stuff though.

Bill

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RE: Are OS 4S engines that bad? - 2/20/2009 2:14 AM   
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Status: offline 		Bill,
You left out the synthetic oil=castor oil debate?

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RE: Are OS 4S engines that bad? - 2/20/2009 2:32 AM   
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RE: Are OS 4S engines that bad? - 2/20/2009 2:43 AM   
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Status: offline 		Somebody needs to dredge up one of those old forgotten threads and start the debate all over again?

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RE: Are OS 4S engines that bad? - 2/20/2009 7:12 AM   
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ORIGINAL: w8ye

Somebody needs to dredge up one of those old forgotten threads and start the debate all over again?


NOOOOOOOOOOOOOOOOOOOOOOOO!!

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RE: Are OS 4S engines that bad? - 2/20/2009 7:44 AM   
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Status: offline 		I was surprised to see this thread revived too, but I enjoy old threads coming back to life.

As an aside, my greatest number of four-strokes are my Saito engines, followed by Enya, OS and then Sanye. With the latest price increases of OS and Saito engines, I'm glad that I have so many engines already bought and paid for.

YS engines are fantastic, but they are over kill for this old man's flying style these days. Besides, I'm most happy when burning 5% to 10% nitro fuel. The latest YS engines will have none of that and still run crisply.


Ed Cregger


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