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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › New O.S. 91 HZ-R - new photo in page 4
04-01-2010 11:21 PM  10 years ago
knightofcarnage

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chicago

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I kinda do agree, the upgrade is a little high. It should be around $130
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04-02-2010 08:40 PM  10 years ago
Chris.C

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Hong Kong

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Got mine yesterday. I don't understand why they take out the cooling ring in the back plate and the mixture adj lever. These items comes with a standard HZ.

It looks to me the check valve is the same one with YS.
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04-03-2010 01:38 AM  10 years ago
Amarjit

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Chicago, IL

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What about the muffler...
Is hatori going to be releasing a new muffler for this engine, or will it still be the sb-20.

Thanks for your help
Andy
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04-03-2010 02:09 AM  10 years ago
knightofcarnage

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chicago

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Hehe i been trying dig something up only thing i found that in Japan they are using 939 for it. At least the post i found.
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04-03-2010 02:41 AM  10 years ago
blade3d

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New Jersey USA

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Why would it need a new muffler ?Blade3d
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04-03-2010 02:44 AM  10 years ago
thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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I have the same question, why?

Why would you need a new exhaust?

Chris
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04-03-2010 03:01 AM  10 years ago
Amarjit

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Chicago, IL

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The 939 is different from the sb-20 correct?
I dont know what specifications require the use of a better muffler for the engine. I just thought I'd ask. Hope they keep it the same with the sb-20

Andy
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04-03-2010 03:06 AM  10 years ago
knightofcarnage

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chicago

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Hatori tunes the mufflers to a particular engine/RPM range.

http://www.hatoriusa.com/?page_id=2
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04-03-2010 04:08 AM  10 years ago
knightofcarnage

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chicago

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No to go off top but here is YS new stuff
http://www.ysengines.net/91sr-3ds-2/
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04-03-2010 09:20 AM  10 years ago
blade3d

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New Jersey USA

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I Thought the RPM remained the Same it's the fuel delivery that is new.Blade3d
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04-03-2010 01:10 PM  10 years ago
Akio Miyata

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Rondonópolis-Brasil

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04-03-2010 01:14 PM  10 years ago
Dr.Ben

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Richmond, VA, USA

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The price for the carb and reg is very close to what you used to pay for a Cline, carb and the mod fee. Three needle OS carbs have always been over $100. The Cline reg was at least $60. So if you do the math for the price of a whole new carb plus a machined aluminum reg, then $220 is pretty much what you'd expect to pay.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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04-03-2010 01:43 PM  10 years ago
synodontis

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United Kingdom

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what I want to see is OS doing us all a favour and start producing engines without carbs as an alternative option so we can use our old carbs from our previous engines. This should be a good idea unless carbs wear out as badly as pistons and liners over normal use.
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04-03-2010 04:21 PM  10 years ago
QuantumPSI

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Atlanta, GA

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I just want the prices to come down. The price of nitro engines have been steadily rising and the power increase from them has been marginal at best. At least with electrics, for the same price you paid a few years ago, you can get a FAR MORE CAPABLE SETUP. I don't even have any big electrics and yet they are starting to look more attractive now......now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part
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04-03-2010 04:40 PM  10 years ago
Aaron29

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USA

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They certainly are inflated. I ended up opting for the OS 50 hyper over the 55 for HALF the cost.
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04-03-2010 05:22 PM  10 years ago
synodontis

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United Kingdom

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Quantum,

We all know that nitro engines are nearing an end in terms of innovations and improvements, that's the real problem. But there are plenty of us who are addicted to these things. An electric motor can give twice the HP of a 90 sized engine without all the grief. I just don't like electrics enough yet and will stay nitro for as long as I can!!! The top F3C guys have already jumped ship.

Aaron,

That OS 50 Hyper is such a screamy thing, really, really off putting . . . .
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04-03-2010 05:51 PM  10 years ago
knightofcarnage

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chicago

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Your right electric can give 2 times the power, but HOLY COW on the cost of batts for it. And you dont get the nitro smell =)
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04-04-2010 01:51 PM  10 years ago
Aaron29

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USA

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Synodontis,

It doesn't have to be with the right muffler. The SB-50 is not so bad. My last muffler was ridiculously loud.

I'll be getting my first 600 size electric very soon. If the experience is anything like the 450's, I think I'll like them. The 450's cost a song to buy and fly.

But there's something visceral about a nitro engine. I'll probably always have one in my fleet even when they are less capable, more expensive, etc.
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04-04-2010 04:11 PM  10 years ago
QuantumPSI

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Atlanta, GA

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I agree with both of you sentiments aaron and synodontis, I'm just saying it's disappointing. I don't see myself getting rid of my nitros any time soon, however, I do see myself staying with older engines for the sake of cost. I only paid $307 for my 91HZ (heli-world had a sale at the time). So for me, I can not justify myself spending $450 (or $200+ for the upgrade) for another one that has a fancy regulator and marginal (if any) power increase....now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part
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04-04-2010 04:38 PM  10 years ago
Dr.Ben

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Richmond, VA, USA

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As long as the Yen conversion is where it is right now, don't expect any quality products from Japan to come cheaply.
Your right electric can give 2 times the power, but HOLY COW on the cost of batts for it.
Not.

I'm using $60/packs Turnigy's in my AMA/FAI model. I'm getting almost the same runtime I had with glow and 50-75% more power. The cost per flight is the same or less than it is for glow. There are other threads which have beaten this issue to death, but anymore cost is no reason to avoid electrics.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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