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HomeAircraftHelicopterMain Discussion › 700 Nitro Engine Choice..YS 120 SRX or OS 105 HZR which one has the most guts for Hardcore 3D?
06-25-2014 06:30 AM  3 years agoPost 1
DHolder

rrNovice

Battle Creek,Michigan

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Which engine in your opinion has more of what it takes (POWER) for a 700 size nitro. Iv'e been flying 600 size and want to move up!

Never Fear Don is Here!

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06-25-2014 10:26 AM  3 years agoPost 2
Richardmid1

rrProfessor

Leeds, England

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Either will have more power than you need. Even a 91 will out perform a 50 size heli most of the time.

There is also more to power than the size or type of engine like pipe choice, governor, throttle servo, fuel, head speed and more importantly tuning.

60% of the time, it works every time!

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06-25-2014 11:10 AM  3 years agoPost 3
Auddiss

rrNovice

CT

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Loving the power of my 105 hzr it is a beast

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06-25-2014 02:25 PM  3 years agoPost 4
bkervaski

rrElite Veteran

Birmingham, AL, USA

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I fly both in two Synergy N7s.

I like the 120SRX for torque and power but it does vibrate more and is harder to tune. It has noticeably more power than the 105HZR. A good flybarless sensor is a must (ie, VBar Silverline or CGY750).

The 105HZR is smooth and powerful and easy to tune (if you get a good regulator, there are issues with some of them).

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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08-05-2014 08:10 PM  3 years agoPost 5
Rob43

rrKey Veteran

Midland, MI USA

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It's sort of odd how these engines seem to be all their own personality. I have run a number of mid size engines. I have a YS 60sr, and it's tempermental. Makes substantially more power than other mid size engines I've run, but is finicky on needles - harder to tune. I have a YS 91sr, and it's a dream to run and tune. Smooth as silk and easy to tune. I was wondering the same thing...OS105 or YS120srx. I've seen some post that they get more power from their YS 91srx than their OS105. Seems it's different strokes for different folks.

Rob

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08-05-2014 10:50 PM  3 years agoPost 6
unclejane

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santa fe, NM, USA

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I'd go with the 105 just for the gentle handling alone. It's going to make crazy power too, but will also have the typical OS pussycat behavior for starting, idle, etc.

The HZ-R regulator MUST be used with a good filter and you must exercise operating room cleanliness when assembling the line from the filter to the carb inlet. Even the tiniest bit of debris will basically disable the regulator.

But once setup, you never have to mess with it again until it's time to change the lines and/or filter. Works like a charm...

LS

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08-06-2014 01:57 AM  3 years agoPost 7
JayL

rrVeteran

Leesburg GA

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I thought the 120 srx was smoother running than the sr but i guess still not smoother than an os

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08-07-2014 04:21 AM  3 years agoPost 8
chabs

rrApprentice

Virginia Beach

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I've flown both motors and recently switched to the 120srx.

The YS isn't quite as smooth as the 105, but has far far more power than the 105. The ys so far has been much much more consistent than the 105 HZ-R. The tuning "window" on the 105 is much more forgiving than the YS to tuning adjustments as the needle valves are not quite as sensitive. Although with the power of the 120 the tuning isn't quite as critical as even rich it still has a ton of power.

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08-07-2014 10:40 AM  3 years agoPost 9
Jeff polisena

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westpalmbeachflorida usa

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I like to fuel and go so OS 105 for me . You can get power out of both ,the 120 will take some patience to get dialed in and will need tweaking every now and then where the 105 seems to tune and stay consistent. Haven't seen too many people out fly 105 to have to go to 120 looking for more power .

I stole it ,flew it and gave it back ;)

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09-28-2014 06:14 PM  3 years agoPost 10
Rob43

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Midland, MI USA

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This time of year in Michigan is great. It's cool in the morning, warm afternoons and pleasant to go flying. But, both my YS engines need to be tuned to get the power throughout the day. Early flights need to enrich the needle, and afternoon flights, lean a couple of clicks. There's maybe a 20F swing in temps. Not a big deal, really.

I just amazed at what these new engines can do in a basic 700. I love flying the 700N with YS 91sr, but really want to plant the bigger engine inside. Not sure which one to get.

Also can't believe the price difference to order from RC Japan. 20%!

Rob

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09-28-2014 06:27 PM  3 years agoPost 11
unclejane

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santa fe, NM, USA

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Well you'd have to make the same adjustments no matter what motor you went with, so it's a 6 of one/half-dozen of the other kind of thing IMO.

I'm at 7000' MSL and when I flew nitro, my 105 (the HZR version) always ran rich even with both needles fully closed. So I just had to live with being too rich in the summer lol.

As I posted earlier in the thread, I'm partial to the 105 so that's what I'd recommend going with. Its not going to be underpowered whichever one you choose, tho....

LS

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09-28-2014 08:00 PM  3 years agoPost 12
Dr.Ben

rrMaster

Richmond, VA, USA

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The larger the displacement a single cylinder engine is, the more it is going to vibrate unless it is precision balanced for only a certain rpm (not what we want for our engines). OS intentionally stopped at 1.05 versus 120 because they were not satisfied with the vibration of the larger displacement. From all reports Yamada did about as well as they could with the SRX. I suppose the first real question to be considered is not so much which engine has the most power for the most aggressive flying but rather do they have enough power. Clearly the answer is yes for both choices, so it comes down to what you want in the overall package in terms of tuneability and smoothness.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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09-28-2014 10:58 PM  3 years agoPost 13
Ghostrider

rrElite Veteran

San Diego, CA

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The YS91SRX Tareq is the best compromise in my opinion. Very smooth, easy to tune, more power than the OS105 and pretty much set it and forget it!

I have yet to run into anyone flying this motor that is not happy with it.

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09-29-2014 12:34 AM  3 years agoPost 14
don s

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Chesapeake, VA

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We need a twin cylinder nitro.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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09-29-2014 01:35 AM  3 years agoPost 15
rudyy

rrElite Veteran

E. Amherst, NY

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Get the YS-91SRX. It will perform as good as the other two if not better.

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09-29-2014 04:51 AM  3 years agoPost 16
Rob43

rrKey Veteran

Midland, MI USA

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We need a twin cylinder nitro.
...with dual exhaust, LOL

Rob

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09-29-2014 05:27 AM  3 years agoPost 17
BobOD

rrElite Veteran

New York- USA

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I would like to know how the 120SRX compares to the 120SR. If someone who has worked with both could describe the difference that would be great.
My YS's have all been better for power but I wasn't so impressed with the 120SR. I want to re-gear my Trex 700N to run 2300 head speed so might give the SRX a try.
Have they nailed it yet?

Team POP Secret

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09-29-2014 06:31 PM  3 years agoPost 18
Tyler

rrElite Veteran

Chicagoland area

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Considering the Hatori will not offer a warranty on their YS 120 muffler due to excessive vibrations, I would give the OS a very solid consideration. Hatori's stance speaks volumes!

Enjoy things that money can buy IF you don't lose the things money can't buy.

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09-29-2014 10:09 PM  3 years agoPost 19
MikeG4936

rrNovice

Irving, TX

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Another vote for the YS 91 SRX. More power than the OS 105 and is quite easy to tune. Temps stay manageable even in the 100+ degree Texas summer. Never seen someone who was unhappy with this motor. Even Tim Jones switched back from the 120 SR to the 91 SRX.

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09-30-2014 03:04 AM  3 years agoPost 20
BobOD

rrElite Veteran

New York- USA

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I have a 91 SRX. Not enough power for what I'm trying to do. I need a 120 that can run well on 30% Nitro. Vibes don't worry me, I can deal with that. More power it's to be expected.

Team POP Secret

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HomeAircraftHelicopterMain Discussion › 700 Nitro Engine Choice..YS 120 SRX or OS 105 HZR which one has the most guts for Hardcore 3D?
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