RunRyder RC
 7  Topic Subscribe
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1531 views
Scorpion Power Scorpion Power
HelicopterAlignT-REX 700N › Which engine for the 700N?
03-20-2009 07:34 PM  8 years agoPost 1
jgunpilot

rrKey Veteran

Pollock, LA

My Posts: All  Forum  Topic

Before I go off and just buy the first .91 I come across, what engines are you guys having great success with, and which are to be avoided? I've neve had a pumper engine yet, should that be a major consideration? I'm running an OS .50 Hyper with a header tank on my Raptor, should I stick with a similar setup?

Thanks in advance for your replies.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-20-2009 08:36 PM  8 years agoPost 2
MR SLOWFLOW

rrVeteran

N.J/N.Y

My Posts: All  Forum  Topic

o.os. hz non pump in mine.

aka MR AIRBRUSH

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-20-2009 09:53 PM  8 years agoPost 3
baddynergy

rrElite Veteran

sierra madre, ca-​usa

My Posts: All  Forum  Topic

ys91sr, Os91hz, or Align 91hz. There all good engines.

**Unattended children will be givin a shot of espresso and a puppy**

PM  EMAIL  GALLERY  Attn:RR  Quote
03-20-2009 09:56 PM  8 years agoPost 4
rc.chris

rrApprentice

brunswick, ga. 31525

My Posts: All  Forum  Topic

I have a YS sr in mine, its new and havent got it leaned out yet but so far it runs great! It is cheaper that the OS also!

http://www.jaxrc.com

PM  EMAIL  GALLERY  Attn:RR  Quote
03-20-2009 10:01 PM  8 years agoPost 5
oysifly

rrVeteran

Bentonville, AR

My Posts: All  Forum  Topic

I run the OS non pumped too and it makes great power. A friend of mine is running the SR and in big sky maneuvers the SR seems alittle better. But on the deck and FF they are the same...can't go wrong with either.....

Quick...here comes my wife....hide that new Heli !!!!

PM  EMAIL  GALLERY  Attn:RR  Quote
03-20-2009 10:06 PM  8 years agoPost 6
payne1967

rrElite Veteran

uk

My Posts: All  Forum  Topic

the 700 going through maingears everywhere then i think an os28 has enough power to keep the gear from stripping

mines got a non pump c spec
i've too many problems with the pumps to use another pumped engine

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-20-2009 11:21 PM  8 years agoPost 7
LONEWOLF2440

rrElite Veteran

MYRTLE BEACH S.C

My Posts: All  Forum  Topic

I havnt stripped the new type maingear yet and im ruff with it

MIKADO LOGO 600 TREX 550

PM  EMAIL  GALLERY  Attn:RR  Quote
03-22-2009 10:50 AM  8 years agoPost 8
Helinutnz

rrElite Veteran

below 42 South

My Posts: All  Forum  Topic

2 91 hz's here and they both pull like schoolboys.

Try climbing tic tocs on them....they just keep pulling through them.

Mine are non pumped....I do feel a little leaning at the bottom of the tank but not till it's almost empty.

Best engine OS has ever made. Finally a descent 91 motor.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-22-2009 12:11 PM  8 years agoPost 9
Popcorn

rrVeteran

Switzerland

My Posts: All  Forum  Topic

another vote for the OS HZ non pump. This engine is so easy to tune and makes great power!

PM  EMAIL  GALLERY  Attn:RR  Quote
03-22-2009 12:57 PM  8 years agoPost 10
Helinutnz

rrElite Veteran

below 42 South

My Posts: All  Forum  Topic

BTW the HZ is super smooth.....least vibe I have felt in an 90 by far. MY c spec was a vibe machine. yuk.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-22-2009 07:56 PM  8 years agoPost 11
JAGNZ

rrProfessor

Auckland, New​Zealand

My Posts: All  Forum  Topic

+1 OS-HZ or Align 91H non-pumped. I have the Align and love it. Super easy to tune, mega power and smoooooth.


Jason Greenwood

www.3dheli.co.nz

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-22-2009 09:06 PM  8 years agoPost 12
MAXHSHV

rrKey Veteran

,mn usa

My Posts: All  Forum  Topic

i have the ys 91 sr with a outrage pipe in my t700n and it flatout rocks, will hold 14 pitch forever.
plus the ys is pumped and only $319.00 at heliproz .runs perfect carb is very smooth no lean spots runs the same start to finish.Also very easy breakin.

Century heli rep. To much power is never enough.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-22-2009 09:12 PM  8 years agoPost 13
baddynergy

rrElite Veteran

sierra madre, ca-​usa

My Posts: All  Forum  Topic

here is a comparison. 2 of the guys I fly with have the OS91hz and 2 of us have the Ys91sr. In all honesty, there is not much difference in flight power wise. Atleast not that we can tell. That being said, I would probably go with which one you could get cheaper. Like I said in an earlier post, They are both great engines.

Both the Ys and Os are EASY to tune, if you understand the 3 needle carbs. All have comperable power. Its up to you, but the Align version of the Os91 is probably the cheapest out of the 3. In fact its about 100bucks cheaper than the Os91, and maybe 20dollars cheaper than the Yssr.

**Unattended children will be givin a shot of espresso and a puppy**

PM  EMAIL  GALLERY  Attn:RR  Quote
03-22-2009 10:43 PM  8 years agoPost 14
aviation

rrVeteran

Quebec Canada

My Posts: All  Forum  Topic

Which Motor

So what is wrong with the OS 91 HZ pumped. That is the one that I would take

aviation

PM  EMAIL  GALLERY  Attn:RR  Quote
03-22-2009 10:59 PM  8 years agoPost 15
JAGNZ

rrProfessor

Auckland, New​Zealand

My Posts: All  Forum  Topic

So what is wrong with the OS 91 HZ pumped. That is the one that I would take
More complexity with little if any benefit. Plus it costs more...


Jason Greenwood

www.3dheli.co.nz

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-22-2009 11:01 PM  8 years agoPost 16
Mike Bilyk

rrApprentice

Tulsa, OK - USA

My Posts: All  Forum  Topic

hands down YS, 91sr with a hatori pipe, it pulls like a tractor...

the os 91hz also runs good.

AMA # 617778
Team MasterCard

PM  EMAIL  GALLERY  Attn:RR  Quote
03-22-2009 11:06 PM  8 years agoPost 17
JAGNZ

rrProfessor

Auckland, New​Zealand

My Posts: All  Forum  Topic

Everyone raves about the YS but here is what I personally do not like. All that extra bloody plumbing with a check valve that can fail. Not to mention having a highly pressurised fuel tank which can cause leaks (I have seen it) and split tanks. You also have the royal pain of remembering to release tank pressure before re-fueling. Oh and how about the notorious issue of the carb spitting fuel? Add to that hard to find and get parts and that seals the deal for me.

I am sure it is a great engine but the hassle to me is simply not worth it. Especially now that the OS 91 is a good engine (and the Align version is CHEAP). Previous OS 91's were pigs to be sure...I just do not see what benefit the YS brings to the table OVER the OS any more.


Jason Greenwood

www.3dheli.co.nz

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-23-2009 12:01 AM  8 years agoPost 18
baddynergy

rrElite Veteran

sierra madre, ca-​usa

My Posts: All  Forum  Topic

...I just do not see what benefit the YS brings to the table OVER the OS any more
more consistency from beginning to end of tank.
All that extra bloody plumbing with a check valve that can fail.
Its the exact same number of fuel lines. Instead of coming from the exhaust it comes from the backplate with a check valve in it.
Oh and how about the notorious issue of the carb spitting fuel?
NEVER seen this on a properly tuned engine. Every engine can do this when run rich.
You also have the royal pain of remembering to release tank pressure before re-fueling.
I release tank pressure on all my engines after flight wether they be Ys, Os or TT. Its really no big deal.
Not to mention having a highly pressurised fuel tank which can cause leaks (I have seen it) and split tanks.
Never seen a tank split, but then again any engine can make one of these POS Align tanks leak especially the 700 with its stupid dual plugs.

I am not being a cheerleader for any Co. I call it they way I see it. They are ALL good engines and each and everyone of them has their strong and weak points.
But that Align version of the OS sure is cheap, how is the warrenty on it??

**Unattended children will be givin a shot of espresso and a puppy**

PM  EMAIL  GALLERY  Attn:RR  Quote
03-23-2009 12:08 AM  8 years agoPost 19
Mike Bilyk

rrApprentice

Tulsa, OK - USA

My Posts: All  Forum  Topic

All that extra bloody plumbing with a check valve that can fail. Not to mention having a highly pressurised fuel tank which can cause leaks (I have seen it) and split tanks. You also have the royal pain of remembering to release tank pressure before re-fueling. Oh and how about the notorious issue of the carb spitting fuel? Add to that hard to find and get parts and that seals the deal for me.
ive never heard any of this rubbish before your post... the fact is the YS is a smoother running, more powerfull engine, thats what seals the deal for me

AMA # 617778
Team MasterCard

PM  EMAIL  GALLERY  Attn:RR  Quote
03-23-2009 04:41 AM  8 years agoPost 20
Chuck Bole

rrElite Veteran

Tulsa Ok. U.S.A.

My Posts: All  Forum  Topic

Hey Mike, it's been awhile since i ran nitro anything.. Last YS engine i had was a YS 61ST2. If that tells ya anything.

It was smooth running, and set and forget... But ask me how i know how Nitro tastes..... Forgetting to release the pressure after a flight would hydro lock the engine in a heart beat. Not to mention the fuel shower... Usually only took 1 or 2 times to learn ya not to forget....and i remember guys wraping tape around the fuel tank..
(leaks from pressure) This was back in the day tho...
Most things are better now..
later
chuck

Team Synergy Field Representative / Thunder Power

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1531 views
Scorpion Power Scorpion Power
HelicopterAlignT-REX 700N › Which engine for the 700N?
 Print TOPIC  Make Suggestion 

 7  Topic Subscribe

Wednesday, November 22 - 4:02 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online