Ys91ac Questions  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Ys91ac Questions
Page: [1]

Login
Message << Older Topic   Newer Topic >>
Ys91ac Questions - 5/18/2003 6:59:28 AM   
flyindustman



Posts: 20
Joined: 2/4/2003
From: N. Las Vegas, NV, USA
Status: offline 		THIS IS MY FIRST YS ENGINE, AND I NEED TO KNOW A FEW THINGS.
I LIVE AT ABOUT 5800FT AND USE REDMAX 15% FUEL, OS#F GLO PLUG.
MY FIRST PROP I TRIED WAS THE 16X4W APC, AND I ONLY REACHED ABOUT 8300RPM......IS THAT RIGHT FOR MY ALTITUDE??
THE SECOND PROP IS A 14X6 APC, AND REACHED JUST ABOUT 10K.
I'VE READ THAT THIS ENGINE IS HAPPY AROUND 9500R'S, WOULD THE 15X4W BE IN THE RANGE??
I HAVE THIS ENGINE ON THE RAZZLE 3D AND WAS EXPECTING GREAT THINGS, BUT THE ENGINE STRUGGLES TO HOLD THE PLANE IN A HOVER....ABOUT 3/4 TO FULL THROTTLE.
SHOULD I EXPECT MORE OUT OF THE ENGINE??
THE ENGINE HAS GREAT COMPRESSION, BUT CLICKS EVERYTIME I TURN IT AROUND........COULD THE TIMING BE OFF JUST ENOUGH TO CAUSE A LITTLE VALVE NOISE? I DID BUY THIS ENGINE USED!
IT RUNS GREAT, IDLES GREAT AND HAS GREAT TRANSITION, BUT I EXPECTED A LITTLE MORE POWER CAPTAIN!!
ANY INPUTS ARE APPRECIATED!!!!!

_____________________________

HERE, LET ME SHOW YOU........OOPS, SORRY!
       Post #: 1

More go - 5/18/2003 7:15:38 AM   
Hobbsy



Posts: 10482
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		You gotta feed it 20% to get the max out of it, it was engineered to run on 20% nitro.

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to flyindustman)
       Post #: 2

Ys91ac Questions - 5/18/2003 7:29:09 AM   
w8ye



Posts: 17200
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: online 		The clicking you hear is common to most four strokes. It is normal.

Jim

_____________________________

Attended the CutFinger Institute of DirtNap University for years but never did graduate....

Club Saito Member #7
Original AMA #31261

(in reply to flyindustman)
       Post #: 3

The clicking - 5/18/2003 7:59:43 AM   
flyindustman



Posts: 20
Joined: 2/4/2003
From: N. Las Vegas, NV, USA
Status: offline 		With this clicking noise, sometimes when I turn the engine over, it feels like it's binding something.....just a little bit, but that conserns me.

_____________________________

HERE, LET ME SHOW YOU........OOPS, SORRY!

(in reply to flyindustman)
       Post #: 4

Ys91ac Questions - 5/18/2003 7:41:44 PM   
dickj



Posts: 310
Joined: 8/3/2002
From: Kent WA & Mesa AZ, WA, USA
Status: offline 		I have A YS-91Ac and run a Graupner Prop 15X8 and it turns around 9000 plus. If you want the power use at least 20percent oil and nitro of 20 percent. It will perform super on Heli 30 percent try it and see/feel the difference. Make sure you adjust the valve clearance after a hour of run time when new.


_____________________________

Whatever goes up, doesn't necessarily come back in the same conditon.

(in reply to flyindustman)
       Post #: 5

Ys91ac Questions - 5/19/2003 2:41:29 AM   
w8ye



Posts: 17200
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: online 		The slight resistance you feel is the cam pushing the valves open

Enjoy,

Jim

_____________________________

Attended the CutFinger Institute of DirtNap University for years but never did graduate....

Club Saito Member #7
Original AMA #31261

(in reply to flyindustman)
       Post #: 6

Page:   [1]
All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Ys91ac Questions
Page: [1]





Jump to:


Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Member Video Posts | RCU Video Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

© 2001 - 2007 24-7 RC, LLC, all rights reserved.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America

Kaango.com Classifieds

0.906RCU1