YS Guru's Help needed  
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 >> YS Guru's Help needed
Page: [1]

Login
Message << Older Topic   Newer Topic >>
YS Guru's Help needed - 4/30/2003 9:01:42 PM   
Joaquin



Posts: 86
Joined: 5/16/2002
From: Pachuca, MEXICO
Status: offline 		NEW YS-110 idle attitude problems...

The engine its mounted inverted with the tank at the CG, it can be adjusted to idle around 2500 RPM's with no problems; you can maintain it idle the whole tank if you want.

The problem comes when you change the attitude of the plane; if you put the plane nose up or inverted it would accelerate and then die (lean), if you go nose down it will just die (rich).

The symptoms look like an under pressurized system, so I check the pressure built in the tank and it seems poor to me, so after checking for any possible pressure leak(every thing was OK; I tried four different check valves 2-YS, 1-Tettra and 1-Cline

YS and Tettra: same result poor pressure.
Cline: The engine was not able to pressurize the tank, the pressure coming from the engine was not enough to open the valve.

I check the fuel pump ducts and the silicone gasket for any leak or obstruction; nothing found.

Could it be a misalignment or defect on the disk valve?
Any other suggestions???

Thanks,
Joaquin

_____________________________

The diference between a man and a boy is the price of the toy...
       Post #: 1

YS Guru's Help needed - 4/30/2003 9:08:17 PM   
w8ye



Posts: 17462
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: offline 		You probably should see what the distributor says? Sounds like your cover is turned around or something wrong with the diaphragm? As far as pressurizing the tank, it shouldn't have much to do with the diaphragm? That's timed by the crank. Maybe you have a crankcase leak?

On the Cline duck bill check valves, they rarely ever work to begin with. The rubber is stuck together. you have to nudge them open the first time with a pencil or something.

Good luck,

Jim

_____________________________

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

Club Saito Member #7
Original AMA #31261

(in reply to Joaquin)
       Post #: 2

YS Guru's Help needed - 5/1/2003 4:11:03 AM   
Joaquin



Posts: 86
Joined: 5/16/2002
From: Pachuca, MEXICO
Status: offline 		YS Guru's where are you???

_____________________________

The diference between a man and a boy is the price of the toy...

(in reply to Joaquin)
       Post #: 3

YS Guru's Help needed - 5/1/2003 4:42:03 AM   
azhar


 

Posts: 571
Joined: 2/21/2002
From: Redmond, WA, USA
Status: offline 		Joaquin,

When the engine is at idle, it is not quite pressurizing the tank. I would up the throttle a little for a few seconds to get the tank pressurized properly. Anyway, you should idle reliably at 2000.

Also check that your regulator screw is flush with the housing. Other than this, I do not know what to suggest except to ask Dave Shadel himself in the YS Engine support forum.

Azhar

(in reply to Joaquin)
       Post #: 4

YS Guru's Help needed - 5/1/2003 8:39:05 PM   
deputydog


 

Posts: 1295
Joined: 1/17/2002
From: poway, CA,
Status: offline 		Are your pressure and fuel lines backwards? You need to go above idle to get some pressure in the tank. How many tanks have you run through the motor? If this is the first tank why are you even messing with nose up/nose down and idle. bring the motor up to about 4k and let it run for a couple tanks then start your adjustments(put the low end back to factory settings on the initial runs!).

(in reply to Joaquin)
       Post #: 5

YS Guru's Help needed - 5/1/2003 9:36:38 PM   
JWN



Posts: 4897
Joined: 3/26/2002
From: Florence, TX, USA
Status: offline 		Like the other guys have said, the YS operates on draw rather than pressure at idle. What you are seeing is very normal IF you are changing the attitude for a long period of time. Think about it, how long do you operate the engine at idle with the nose straight up while flying?

John

(in reply to Joaquin)
       Post #: 6

YS Guru's Help needed - 5/2/2003 6:28:43 AM   
m.gramling



Posts: 1787
Joined: 1/8/2002
From: Atoka, TN, USA
Status: offline 		to my limited YS knowlegdge.
My YS63 runs on a suction just like most of the other RC engines at 2000RPM or below. And anything above 2k it starts pressurizing the tank, and starts regulating it thru the regulator.

I am sure by now, that you probably have ran about 4 tanks thru it. So it should be ready to start tweaking the system.

I am sure you know this as well, but since you didn't state it. What fuel are you running. As you know YS's like 20/20 are higher nitro contents. Also is the fuel fresh, I can tell on my little YS 63 when the fuel is starting to get old,.

Also what plug are you running. Probably won't have much to do with your problem, but most people I know, run a OS "F" to clean up the midrange.

I know I haven't dropped much help with you. Like somebody stated above, you can always ask Dave in the YS manufactoring forum. He has helped me a lot. Just state everything you have done, what fuel, plug, and prop. that you he has all the info their and he won't have to ask.

_____________________________

Everybody wants to go to heaven, but nobody wants to die...

(in reply to Joaquin)
       Post #: 7

YS Guru's Help needed - 5/2/2003 9:11:00 PM   
Joaquin



Posts: 86
Joined: 5/16/2002
From: Pachuca, MEXICO
Status: offline 		Let me give you some feedback why I tried different attitudes on ground.

First I put two tanks for break in on the ground, then I and went into the air!!!
For the first flights I added a button to offset the throttle so the engine would run at 3k at idle and the turn it off just for landing.
I adjusted the idle to 2.5k with no problems on the ground.
Third and fourth flights, using the throttle offset (3k) 6 minute flight ended dead stick.
So I think: OK maybe my adjustment at idle was not good...
I verified the idle and everything was just O.K. for the test I leave the idle from 30 Secs to around two minutes and apply full throttle
with no problems at all.
I went to the air and ended with dead stick, so I tried two more flights (that also ended on dead stick) looking for the flight path used when the engine dies. and thats how I ended checking the attitudes...

After some more tests I think I'm around 10 tanks

_____________________________

The diference between a man and a boy is the price of the toy...

(in reply to Joaquin)
       Post #: 8

YS Guru's Help needed - 5/2/2003 10:57:42 PM   
azhar


 

Posts: 571
Joined: 2/21/2002
From: Redmond, WA, USA
Status: offline 		Jaoquim,

Is this engine in a cowled application?? If so you may have an overheating problem. Make sure there are enough holes to vent. You may be rich on the ground, but if the hot air in the cowl does not get a chance to vent, it will overheat the engine.

Azhar

(in reply to Joaquin)
       Post #: 9

Page:   [1]
All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> YS Guru's Help needed
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

0.625RCU1