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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › OS 55HZ & Powerboost Pipe Vs YS 56SR & Hatori SAB55
04-07-2010 11:52 PM  8 years agoPost 1
RotorHead486

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England

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Just looking at sorting a new setup for my upcoming N5 and with both the OS 55HZ and YS56SR being out for some times now, wondering how everybody is finding these motors are running and if anybody has had both and compared both?

Be interested in hearing how these engines are running!

One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team

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04-08-2010 03:37 AM  8 years agoPost 2
CoronaL

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Winnebago IL

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onequickgt runs both motors, but not sure about pipes. I talked to him the other night and he says his YS pulls alot harder than the OS, plus runs alot cooler.

Randy!!! I am the liquor

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04-08-2010 11:51 PM  8 years agoPost 3
AaronJohnson

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mason,MI

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The YS56SR pulls a bit harder then the OS55HZ in my expirience. When you talk about average power across the whole flight the YS makes a lot more then OS because it is sooo much more consistent. At the end of the flight when the OS is making better power then they are more comparable but the YS still has more grunt. I have been having my 55HZ coming down with temps from 195 to 220F. My 56SR comes down at 170F almost every single time. These engines are mounted in IDENTICAL helis, (same blades, electronics, collective, cyclic, paddles... same everything) I have tried a Outrage 55 pipe and Hatori SAB-55 on the 55HZ with simaler results. I hope to try the funtech 320 this Sunday on the 55HZ to see what happens. On the 56SR I have been running the Outrage 56 pipe geting awesome performance and super easy tuning.

My .02, Go with the 56SR and Outrage 56 pipe. Its Killer!!!

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04-09-2010 02:09 AM  8 years agoPost 4
fla heli boy

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cape coral, florida

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so you finally talked my dad into an Outrage I hear?? That's cool. I've gotta call him and get the scoop.

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04-09-2010 02:14 AM  8 years agoPost 5
AaronJohnson

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mason,MI

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LOL Well... I just answered his questions about a couple helis he was thinking about and he ended up getting a Velo. I am sure he will love it. They fly phenominally!

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04-09-2010 03:45 AM  8 years agoPost 6
rexxigpilot

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Florida

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Go with the Funtech 320 on the OS55.

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04-10-2010 12:57 PM  8 years agoPost 7
ChrisMoore

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Bay Village, OH

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Aaron,

what do you mean by this?
The YS56SR pulls a bit harder then the OS55HZ in my expirience. When you talk about average power across the whole flight the YS makes a lot more then OS because it is sooo much more consistent. At the end of the flight when the OS is making better power then they are more comparable but the YS still has more grunt.
Why is this the case?

Chris. AMA 497715 IRCHA 3351

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04-10-2010 01:00 PM  8 years agoPost 8
DS 8717

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Because OS tends to lean out as the tank empties unless you use a header tank.The YS has a much better fuel system.The YS also has higher ex port timing which will give it more power if you use the right exhaust sytem.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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04-10-2010 03:45 PM  8 years agoPost 9
rexxigpilot

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Florida

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Guys,
The OP was not asking for opinions on OS vs. YS. He obviously intends to use the OS or YS. He wants to know if he selected the best pipe to use with each. With the OS55 the best pipe you can use for power is the Funtech B320.

The OS55 port timing allows many pipes to work well. Most engines with a high degree of port overlap have this ability. Engines without much overlap need pipe tuning to properly scavenge exhaust gases while preventing the fresh charge from escaping.

With regard to the OS vs YS power controversy, until YS is willing to publish HP and/or torque numbers or someone is willing to test these two engines with real test equipment, any claim that one is more powerful than the other is pure hearsay. All other things being equal, the added 1.8% displacement of the YS should equal a commensurate increase in power and fuel consumption. This difference, if there really is any, would not be discernable given the inaccuracy of tuning and other factors.

If power is what you want in a 50 class engine get the Nova Rossi 57. At 2.4HP it is the power king of the class (KME 60 excepted). This power comes at a price though. The engine is hard to tune and runs at the ragged edge like a race engine.

I don't know of anyone having a problem with the OS55 going lean at the end of the tank. If this is happening, there is likely a problem with the heli's fuel system and not with the OS.

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04-10-2010 05:17 PM  8 years agoPost 10
DS 8717

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Raising the ex port doesnt change the overlap between the intakes and ex,what it does is raise the rpm and power band.OS has 153 degree ex timing and YS has 160 degress which means more rpm and power with the right muffler. The pipe lenght tunes the return waves not the overlap.....
Advertized power ratings aren't worth the paper they are written on,real world power is what matters.

OS engines dont run nearly as consistant as the YS do because of the fuel system. The pumped OS engines are better but still not consistant,the pumps are known to go bad and cause lean runs.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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04-10-2010 09:24 PM  8 years agoPost 11
rexxigpilot

rrProfessor

Florida

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DS, the port overlap has much to do with cyclinder charging and exhaust gas evacuating. A typical RC heli muffler is not a true tuned pipe. Some tuning does exist in our mufflers, but for the most part they don't rely on reflected waves for cylinder stuffing.

I agree the performance numbers presented by the manufacturer are often just marketing hype in the absence of universally used testing standards. But, manufacturers that don't publish any numbers are suspect. For example, Bose doesn't provide specs for their speakers. They rely on advertising and the fact that many customers can't hear worth an crap to sell their products. But under standard tests the Bose speakers perform terribly. Perhaps magazines like RC Heli should start doing independent testing. Wouldn't that be nice.

My experience with YS is not great. I didn't get the 56 because I was so disappointed by my YS 50 and 91 engines. A typical long stroke engine vibrates more and has higher piston speed at any given RPM compared to a more oversquare engine like the OS. This is basic physics.

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04-10-2010 09:45 PM  8 years agoPost 12
synodontis

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United Kingdom

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I am waiting for users of the YS 91SR-3DS to compare smoothness with the original SR. If it's favourable I'll consider YS again, if not then the OS 91 HZ-R for me.

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04-11-2010 08:04 PM  8 years agoPost 13
DS 8717

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It depends on the rod length and wrist pin placement as whether the piston speed will be faster,if you lenghten the rod and raise the wristpin location the piston speed will be slower giving the cylinder more time to fill the cylinder. My SR is just as smooth as my ST.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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04-12-2010 02:36 PM  8 years agoPost 14
rexxigpilot

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Florida

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Piston speed is determined by the stroke length and RPM. A long stroke engine will have a higher piston speed compared to a short stroke engine with the same displacement at the same crankshaft angular velocity (RPM).

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04-12-2010 03:36 PM  8 years agoPost 15
DS 8717

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You are correct,angular velocity is determined by the lenght of the rod. a shorter rod will have a higer velocity angle ie: faster piston speed.Since the SR has a longer rod it will slow the piston down due to the lesser angle velocity.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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04-12-2010 03:51 PM  8 years agoPost 16
Jgatorman

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Birmingham, AL

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Yeh what he said I am running the ys 65 and the funtech b320 so far so good. I would like to hear more from the the more experienced guys on this combo though.

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04-12-2010 03:56 PM  8 years agoPost 17
DS 8717

rrProfessor

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You have a YS 65......where do i get one of those..

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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04-12-2010 04:15 PM  8 years agoPost 18
Jgatorman

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Birmingham, AL

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LMAO damn the aixelsid I mean dislexia

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06-20-2010 04:09 PM  8 years agoPost 19
Rob P77

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Middletown, DE USA

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I have been running an os55hz since they came out and love the engines power and easy tuning however I have had several catastrophic rear bearing failures so since I was in the market for another engine I decided to try the ys56sr. I'm running the b320 funtech pipe and so far it does seem to run well. Starts easy and makes decent power but I only have around 10 flights on it so far. I'm sure it will loosen up a bit and make more power but as of right now my 55 with the align pipe has got it all over the ys. I'm going to try the align pipe on the ys after getting some flights on it and I get a good feel for how well it performs completely broken in and with the b320.

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06-20-2010 06:26 PM  8 years agoPost 20
rexxigpilot

rrProfessor

Florida

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Yup, seems to be a common thread with YS vs OS. OS makes more power, YS doesn't eat through bearings as much. I wonder what the compression ratio is for each engine with the recommended shims for 30%?

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › OS 55HZ & Powerboost Pipe Vs YS 56SR & Hatori SAB55
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