RunRyder RC
WATCH
 1 page 1295 views POST REPLY
HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS50 has me beat
07-15-2002 12:48 PM  16 years agoPost 1
SemiArticulate

rrVeteran

On Location

My Posts: All  Forum  Topic

The top end seems great, the bottom end seems perfect, but I can't seem to do anything about the midrange. It runs rich in the midrange causing vibration and the tail to kick a little. It is very annoying. Leaning up the top end even more seemed to help but then it blew a plug in FFF. I have played with both needles and can't find a happy spot. Any suggestions? Thanks.

PM  EMAIL  Attn:RR  Quote
07-15-2002 02:31 PM  16 years agoPost 2
psawya

rrKey Veteran

Woodinville, WA

My Posts: All  Forum  Topic

What kind of head speed are you running, what is your main gear ratio and blade length. I would say to either re-gear your main to run the engine at a higher rpm or up your head speed a little, or both. Also, if you are running less than say a 580 blade, loading the engine with longer blades or a wider cord could help.

Pete

PM  EMAIL  GALLERY  Attn:RR  Quote
07-15-2002 06:30 PM  16 years agoPost 3
MitchD

rrApprentice

Antioch TN USA

My Posts: All  Forum  Topic

Hey Semi,
Its a PITA but,If you work with the low end or "mixture valve"in small increments (like tiny increments)it will come around for you especially if its broken in.Usually it takes about 2 gallons of fuel to get it running consistently w little or no carb adjustments except for a occasional click or 2 on the needle to compensate for weather/temp etc.After it was broken in, sometimes I had to go back n forth from needle to screw to get it where I wanted it,and it always ended up slightly rich in the midrange,which was no problem.The more fuel I ran through it the better it got,especially in the midrange.
Running any 60 muffler gives it more room to breathe,and seems to desensitize carb adjustments.
One thing I did notice was that I had to go back n forth between the needle and the screw to find a happy spot.Once I got it there only a click or 2 was needed.
This was all done on a Sceadu 50,8.7 :1,600 mm blades,30% ,running both enya 3's and os 8 plugs,and eventually ended up staying w the enya 3 and 30%
Runs nice in the midrange w no shakes at a low headspeed,it just took some work to get it there w /me leaving it slightly rich on the bottom
hope this helps ya out
MD
MD

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
07-16-2002 01:00 AM  16 years agoPost 4
SemiArticulate

rrVeteran

On Location

My Posts: All  Forum  Topic

Yes that is a big help. I think the muffler might be too small. It is supposedly a 50 size muffler but it is not much longer than my 30 and about the same diameter. I have a 60 size I can try and a new 50 size on the way that has much different dimensions. I bet I was moving the low end too much also. I tried a bench break-in on this engine and put one gallon in on the bench. Despite this problem and a few others I had with the conversion, I think I have about two additional gallons in the 50. If I had it to do over again I would have left it a 30 and bought a new 50 heli like everyone had told me to do. The heli is the long boom version with 600mm V-blades and stock gear ratio, 20% fuel, OS8 plug with enya 3 on order, 1850 w/governor, about 1900 without. Thanks for the suggestions. With any luck I can get out and try them before the weekend.

PM  EMAIL  Attn:RR  Quote
07-16-2002 03:17 AM  16 years agoPost 5
AcePilot

rrNovice

Monterrey, MX

My Posts: All  Forum  Topic

question abput the OS50
I have a new OS50 with a Hatori and I notice that at idle it vibrates way too much (bench break-in). In Hi throtle the head is a little bit blurred, is this normal? Does it need more break-in time? (It only have 5 tanks now).

The Prop is a 11X7 balanced.

Thanks for your help

Ace

PM  EMAIL  GALLERY  Attn:RR  Quote
07-16-2002 05:19 AM  16 years agoPost 6
Brian Bennett

rrKey Veteran

Dugway/Tooele UT, USA

My Posts: All  Forum  Topic

IME, The 50 starts to smooth out after the 2nd or 3rd gallon!

Gi

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
07-16-2002 06:17 AM  16 years agoPost 7
fitenfyr

rrProfessor

Port Orchard, Washington

My Posts: All  Forum  Topic

keep flying...
Yep like Mitch said keep burning fuel one tank it will just all of a sudden run like a rabid dog and all is well.
DEFINATELY get a 60 sized muffler. No one I have seen using a "50" sized muffler has been happy with the OS50.

Jason Stiffey
Fly Fast....Live Slow...

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
07-16-2002 06:52 AM  16 years agoPost 8
AcePilot

rrNovice

Monterrey, MX

My Posts: All  Forum  Topic

burnning fuel
Its ok if I continue to burn fuel in the bench? I tried to mount it in the heli, but the vibes makes some radio glitchs, so I returned to the bench.

Thanks for the help and sorry with my english

PM  EMAIL  GALLERY  Attn:RR  Quote
07-16-2002 07:58 AM  16 years agoPost 9
Ken B

rrElite Veteran

Phoenix, AZ

My Posts: All  Forum  Topic

OS 50 with a 50 size muffler
I am running a Hattori 50 size muffler and it is working well. I just wanted to pass that on to you all.

That might be due to my lower nitor content too. I am running 12.5%.

Ken B

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
07-16-2002 11:58 AM  16 years agoPost 10
SemiArticulate

rrVeteran

On Location

My Posts: All  Forum  Topic

how long is you muffler? Mine is just under 6-3/4 end to end but was recommended to me for a 50.

PM  EMAIL  Attn:RR  Quote
07-16-2002 12:37 PM  16 years agoPost 11
Ken B

rrElite Veteran

Phoenix, AZ

My Posts: All  Forum  Topic

From end to end it is 7 inches in length

Ken B

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
07-16-2002 01:53 PM  16 years agoPost 12
Steve Campbell

rrElite Veteran

Baton Rouge, LA

My Posts: All  Forum  Topic

AcePilot,

You have a severe vibration problem somewhere. Since it shakes in your machine as well as on the bench stand, that would indicate it is likely (but not guaranteed) in the engine.

I have seen some recent-manufacture OS engines with over six thousandths run-out on the crankshaft. I have seen crank journals not fully machined, and thus out of balance. I have seen other defects too numerous to mention; not just with OS, mind you. But you expect the absolute best from them, yes? Sometimes, nowadays, they don't deliver that...

I have been a loyal OS user for a long time, but lately (over the past few years) I have noticed a definite decline in QC, as well as questionable manufacturing/design concepts. I'll probably get toasted for these remarks, but flame away. I know what I've seen and experienced.

AcePilot, I would send that engine to Hobby Services with a detailed letter. The Empire has a pretty good service department that will shoot straight with you. If they return the engine saying nothing was found, then you need to start looking at your building/set-up procedures, and your test stand. If all of that checks out, then I would send the engine to a REPUTABLE engine shop, such as Peformance Specialties, and have them check it out.

You should be able to FEEL some vibration; if you can SEE it, you've got a problem, big-time.

Steve

PM  EMAIL  GALLERY  Attn:RR  Quote
07-16-2002 03:31 PM  16 years agoPost 13
fitenfyr

rrProfessor

Port Orchard, Washington

My Posts: All  Forum  Topic

stand...
How tight and sturdy is your break in stand. Steve brought up a good point there. I would install the engine into the heli at this point. 5 tanks is plenty IMO to put it in the heli. See if the vibration is still present then.
I break-in all of mine installed and 0 problems so far.

Jason Stiffey
Fly Fast....Live Slow...

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
07-17-2002 02:47 AM  16 years agoPost 14
AcePilot

rrNovice

Monterrey, MX

My Posts: All  Forum  Topic

OS50
I mounted today the engine in the heli (GPH346) and it stills vibrate. The horizontal fin is oscillating about .5 in at idle. With the older engine (OS46) I didnt have this problem.

Any suggestions before I send it back to Rick´s?

The bench mount I made is of 1" plywood and I use a standard nylon plane engine mount.

Ace

PM  EMAIL  GALLERY  Attn:RR  Quote
07-17-2002 03:56 AM  16 years agoPost 15
Steve Campbell

rrElite Veteran

Baton Rouge, LA

My Posts: All  Forum  Topic

If you purchased the engine from an "authorized" (i.e., US outlet who got it from The Evil Empire) dealer- and Rick's is one such- then return it to Hobby Services in Illinois. The engine instructions should have details on Hobby Service's address, etc.

Returning it to Ron will just slow down the process.

Steve

PM  EMAIL  GALLERY  Attn:RR  Quote
07-17-2002 06:39 AM  16 years agoPost 16
SemiArticulate

rrVeteran

On Location

My Posts: All  Forum  Topic

You were talking about OS engine quality. To be honest, I have had good luck in the past but here are the last three:

OS61WC - The mixture screw would not turn at all right out of the box. Had to send it back. Maybe it would turn when the engine heated up but then I would have had fuel in it and could not return it to the store.

OS50 (this one) - The carb barrel would tend to stick at high and low when the engine was hot. Enough that the servo could not move it. I had to polish the carb barrel a little because it was just a bit rough.

OS91 - I am still being gentle with it and it is doing well but I have the perry pump mod on order. The hyper head gets me. If it is so good then why don't they sell it like that. Its bad enough when helis need upgrades.

YS seems to be building a better reputation all the time. When they have an engine that needs a pump, it actually has a pump.

PM  EMAIL  Attn:RR  Quote
07-17-2002 01:43 PM  16 years agoPost 17
Steve Campbell

rrElite Veteran

Baton Rouge, LA

My Posts: All  Forum  Topic

<>

They've sold me, that's for sure. I've bought my last OS engine. The ones I have now (61 SX non-WC, 61 SFN-H, 2@ 32 SX's, 2@ 40 SF's, and a 70 Surpass four-stroke) except for one of the 32 SX's are all older engines, five years old or more.

I have been significantly underwhelmed with most current-production OS offerings... and that's really a shame. But facts be facts.

Steve

PM  EMAIL  GALLERY  Attn:RR  Quote
07-17-2002 05:55 PM  16 years agoPost 18
Lift

rrElite Veteran

Houston, TX

My Posts: All  Forum  Topic

Comment & Question
I went to YS last fall and am NOT going back. My next YS will be the .80 instead of the OS .91. Nothing against OS it's just that I like the consistency of high nitro and a pump. Period!

Question:
What 60 size mufflers have you guys been able to use. I attempted to use the Hatori 666 2 piece on my OS .50 but ran into a problem when I releazed that the OS .50 engine case is drilled through for 3mm bolts while most .60 size muffler use 4mm. What did you all do?

I just ordered a Muscle Pipe since I heard it is the bomb on the OS .50.

I will tell you that I have tried the Century CN3033B(replaced the "A" version) and the TT .50 muffler. Both seem to restict the engine to much. I tested it by drilling through the baffle on both and the developed ALOT more power. So, it seems to me that these 46/50 size muffler are not large enough. At least with 30% they aren't.

PM  EMAIL  Attn:RR  Quote
07-17-2002 06:12 PM  16 years agoPost 19
fitenfyr

rrProfessor

Port Orchard, Washington

My Posts: All  Forum  Topic

HHI knockoff...
I use the HHI knock off but have just recently found out they went to a drilled flanged instead of the slotted so it won't work now.
I would just drill out the 4mm holes and use blind nuts with the 3mm or I have heard of people sucessfully drilling out the case to accept 4mm bolts.

Jason Stiffey
Fly Fast....Live Slow...

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
07-21-2002 12:32 AM  16 years agoPost 20
SemiArticulate

rrVeteran

On Location

My Posts: All  Forum  Topic

Finally got a chance to work on my engine. I flew from 9:00 to 4:00 in the hot sun and they rain stayed away until just now. The new muffler (50 size that is actually a 50 size this time) removed most of the headache and then it was small adjustments to the idle mixture that finally cured it. Thanks.

PM  EMAIL  Attn:RR  Quote
WATCH
 1 page 1295 views POST REPLY
HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS50 has me beat
 Print TOPIC  Make Suggestion 

 0  Topic Subscribe

Wednesday, September 19 - 4:27 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online