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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › YS vs OS when overheat on the piston
03-09-2010 09:20 PM  8 years agoPost 21
Gearhead

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Vt

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the "line" between well tuned and to-lean is not a "fine line"

Jim
Buzz Buzz Buzz

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03-09-2010 10:11 PM  8 years agoPost 22
uk sailor

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Hello Wasp who are you quoting ?

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03-09-2010 10:19 PM  8 years agoPost 23
Gearhead

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LOL no one..

Jim
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03-10-2010 04:27 AM  8 years agoPost 24
ruddernate

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[quoteI am not aware he is blaming the engines so much as saying the OS APPEARED to let go quicker/easier than the YS.[/quote]

i have to disagree based on this statement
[quoteFor my next engine, oh please NO OS again, although they are now releasing a regulated 91 HZ-R which looks pretty and sounds sweet, but as long as OS dont change their material, I wont buy one again.[/quote]

I think the core issue here is that the OP is blaming materials used by these manufacturers when his personal experience is in no way a controlled test. He misunderstood what happened to each engine and blamed the manufacturer. Granted he said it was his bad tuning and not to beat him up anymore but these statements he's made are simply not accurate. Neither manufacturer are perfect however the pictures are very misleading as to the quality of materials. let's say a newbie sees those pics and believes the materials argument, he will base his decision on which engine to buy on false pretenses. The pics i want to see are of both manufacturer's pistons after several gallons ran through properly tuned engines. These two engines went through totally different situations and can't be judged in the manner the OP tried to judge them. Just my .02 cents and that's not worth much. no offense to the OP intended, i've had some learning experiences tuning myself and i'm still no master but one must always consider the over all experience before judging a manufacturer and be willing to blame himself on occasion. (most often the case with myself)

fly it like you stole it

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03-10-2010 06:51 AM  8 years agoPost 25
uk sailor

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Ruddernate, good post and well put however your two quotes dont actualy work together for me, even though I see how you take that view.
He still did not blame the OS because he says "week three my fault again I misunderstood one half turns" and I think had the mid needle 1/2 turn out rather than 11/2 turns out.
Given his experience with the YS where it has apparently to his being the "Gengis Khan" of engine tuners where he had the high needle closed off by a whole turn his unsubstatiated view is the YS stood up better.
If used correctly most engines will give very good service, but the posts of broken con rods on the HZ made me wonder if this part was not quiet as robust as needed.
As somebody else posted none of the engines are perfect, one might say if an engine was perfect there would be no reason to update as so often happens.
Given the different handleing/treatment each engine receives it might then be a case of perfect for whom.
Perhaps the OP should give it out to NASA as a challenge to make such a beast.
Anyway i'm happy with my two SR's and hope to be with my NOVA 57 if I ever get round to putting it in a model (lots of differing views on this one)

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03-10-2010 07:38 AM  8 years agoPost 26
outhouse

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you cant judge how one piston takes more or less of a beating by how they were self destructed.

he flat stepped on the YS and he ran over the OS with a mac truck

me thinks his wallet beat his tuning skills around in the first dark alley they passed

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03-11-2010 12:40 AM  8 years agoPost 27
ruddernate

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sulphur,Ok.

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uk sailor, i agree with most of your post, however the op did say he wouldn't buy another os because of poor materials. that quote speaks for itself and is inaccurate. here is the part of the quote that has me disagreeing
but as long as OS dont change their material, I wont buy one again
this doesn't sound like he's blaming his tuning skills to me. that's like soaking a truck in gas, setting it on fire and blaming Chevrolet.

fly it like you stole it

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03-11-2010 04:16 AM  8 years agoPost 28
Aaron29

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USA

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Both those pistons are just as unuseable as the other. I don't see how either one held up.

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03-11-2010 04:48 AM  8 years agoPost 29
Paul Woodcock

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Dubai - United Arab Emirates

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Hi guys

I think we are ALL missing the point.

Any engine that is run lean will get hot.... that we know.

The BIG issue that has not been mentioned, is detonation.
If the combo of lean and high compression got to the point of detonation, the temperature would go through the roof very very quickly.

There was hardly a controlled test going on here. Yes the OS looks worse off, but may have had a way higher temperature. They (os) even give you an extra shim to try prevent this. Was it in???

Not a fair comparison for either.

Regards
Paul

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03-11-2010 07:56 AM  8 years agoPost 30
snowman999

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nottingham

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I hope I can take both pistons to University lad to do a full material's characterization testing. Just curious.

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03-11-2010 04:46 PM  8 years agoPost 31
CoronaL

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Winnebago IL

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OS pistons while good for tolerances etc... are cast, and as such will be prone to detonation breakage. I've seen ALOT of OS pistons come apart at the ring land from very short lean runs. Usually at the end of a tank, guy isn't paying attention and gets the motor too warm/hot and then gets an airpocket which starves the motor and it's enough to taco an OS piston. I've seen it happen and I believe it to be endemic to the brand. Doesn't make the OS bad, just somethign to consider.

YS pistons, I'm not sure how they are made, but they do appear from my use/abuse/observation that they will survive detonation without major issue IF heat is kept in check. Now USUALLY heat will follow detonation, but that's a whole different topic debate etc... When the YS lets go due to high heat, it usually melts the piston by the exhaust port and takes the liner with it. MOST times unless the tuning is way off, this happens when you get a pressure leak in the system and get a bad drop in tank pressure and hence fuel pressure.

Either motor is a good motor IMO. I will say that OS tends to have "prettier" machining, and probably a bit higher tolerances on their parts. YS however, seems to be very hardy, and in the US at least, the support is WAY better at YS parts and service vs Hobbico for OS. Hobbico Futaba and Krysta have taken care of the lone Futaba issue I had, so I'm two thumbs up on Futaba support. Maybe Krysta can get promoted to take over OS support too .

All things being equal I'd prefer to run YS motors over OS. However, I've been very happy with the OS91HZ's and OS55HZ's I've been using and see no reason to replace them with YS motors until I have a problem with them. As much as I prefer YS > OS I actually only have 2 helis with YS motors in them, vs 4 with OS motors lol. Just the way the OS55 launched quite a bit earlier than the YS56, so 2 right there .

Hope the OP can disregard some of the negative posts bout tuning issues. WE all make mistakes. When you come on a forum, and try to post about something you've noticed or considered, and get beat up about it, I just don't like that attitude. WE should all be trying to help eachother not slam eachother.

Randy!!! I am the liquor

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03-11-2010 05:14 PM  8 years agoPost 32
uk sailor

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CoronaL nice post with good and interesting points

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › YS vs OS when overheat on the piston
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