RunRyder RC
 9  Topic Subscribe
WATCH
 1 page 1514 views
Scorpion Power Scorpion Power
HelicopterEngines Plugs Mufflers Fuel › Tried TT Redline 53 because of OS bearing issue.​Still same
10-05-2010 05:02 PM  7 years agoPost 1
Halert71

rrApprentice

Ridley Park, PA

My Posts: All  Forum  Topic

This is my Theunder Tiger engine after about 6 gallons. First was about 3 gallons of Cool Power 30% then switched about 3 of Magnum 30%

Ordered a new bearing set stainless steel from rcbearings. Will see how that holds up.

Maple syrup is supposed to be on the table before the pancakes.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-06-2010 12:51 AM  7 years agoPost 2
Turkana

rrKey Veteran

Montreal,Quebec ,​Canada

My Posts: All  Forum  Topic

Its not the bearings fault. Its mostly preignition that kills them. Try a second headgasket to alter ignition to a bit more late and you should be fine.

Regards Pete

PM  EMAIL  Attn:RR  Quote
10-06-2010 02:40 AM  7 years agoPost 3
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

Ordered a new bearing set stainless steel from rcbearings.
Been there, done that. Though they stay shiny much longer, the races tend to start flaking off microscopic bits of metal that go through your motor. Under magnification, the part of the race where the flakes are coming from looks like a bowl of corn flakes, only shiny.

If you've been running that motor on a regular basis, I'll bet that although you see rust on the edges of the races, the actual bearing surface is nice and clean.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
10-06-2010 03:19 AM  7 years agoPost 4
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

In certain climates and regardless of what fuel you use, you can have problems with rust or corrosion. If you develop a practice of using a preservative after run oil such as ATF, you'll find your bearing issues will decrease dramatically.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

PM  EMAIL  GALLERY  Attn:RR  Quote
10-12-2010 01:43 AM  7 years agoPost 5
hornet dave

rrKey Veteran

Cedar Rapids, IA USA

My Posts: All  Forum  Topic

Problem is that you started with cool power and switched to magnum. I've seen this a lot of times, my group flys a lot of magnum. Cool power seems to make more crud in the engine while magnum tends to try to clean out the crud - the rear bearing is the victim. Dont switch from cool power to magnum.

I got a fever! The only prescription is MORE 6HV

PM  EMAIL  GALLERY  Attn:RR  Quote
10-12-2010 02:45 AM  7 years agoPost 6
Santiago P

rrProfessor

South West, Ohio

My Posts: All  Forum  Topic

Everybody has given a good answer to why bearings on 50 engines tend to live short lives. Is not the bearings, but the nasty enviroment they operate.

Humidity: I you fly in a predominaly humid enviroment, any leftover fuel inthe engine after a day will hold moisture and kick start the corrosion process

Preignition: On of the most underlooked problems by 2 stroke users specially in summer temperatures. Most people cannot tell when it occurs and yet the engine still runs steady and makes some power, but it is beating itself up. If the head is removed, pitting of the pison surface is the most obvious indication. Short lived bearings is another. Hotter mufflers/pipes agravate the timing issue, unless the user knows whe to use a colder plug or shims the head up accordingly.

Drivetrain: Very few folks bother to balance or will true the alignment of the flywheel, clutch assy, etc. Out of run gear puts uneven load cycles all the way to the engine bearings. Out of balance clutch-flywhell-fan assy are bearing killers. For most 50 size helis there is little you can do as most kits today are bolt-n-go. I still believe, any bit of balancing or true-ing you do will go a long way on bearings.

For what is worth I had bearings sets on my OS50hyper-Raptor50 last up to 15 gallons in 2 years, and I flew is like I stole it in muggy Ohio weather using the same fuel. I did use after run on longer than 1 week pauses. I did balance the fan clutch, and originally cut the webbing of the crankshaft. I added .004 to the head when I started using 30% fuel with Muscle pipes in the summer.

Santiago
Magnum Fuel Field Representative

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-16-2010 02:00 PM  7 years agoPost 7
Zaneman007

rrElite Veteran

Texas - USA

My Posts: All  Forum  Topic

How are you getting the after run oil in there?

Are you taking the carb off?

Old Guys Rule!

PM  EMAIL  GALLERY  Attn:RR  Quote
10-16-2010 03:35 PM  7 years agoPost 8
nickt919

rrVeteran

New Orleans,​Louisiana

My Posts: All  Forum  Topic

If you develop a practice of using a preservative after run oil such as ATF, you'll find your bearing issues will decrease dramatically.
^^ This was the key for me. I use to go through some bearings on my engines...... since I got into the habit of getting all the fuel out of the engine at days end and oiling the bearing directly afterward the bearing life has increased tremendously.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-16-2010 04:27 PM  7 years agoPost 9
Flying Tivo

rrKey Veteran

Monterrey,NL,Mexico

My Posts: All  Forum  Topic

Post flight routine

After the last flight of the day. I will clip the fuel line and run the engine until it dies, give a few cranks after that with the glow plug on. While the engine is hot, i will plug the muffler and manually close the carburator.

I know this is not perfect, but they do last longer!

Felipe

If life throws at you lemons......Squirt some lemon juice in the eye of your enemy!!!!

PM  EMAIL  GALLERY  Attn:RR  Quote
10-17-2010 09:07 PM  7 years agoPost 10
jasonrusso

rrApprentice

Haverhill,​Massachusetts

My Posts: All  Forum  Topic

Ok, I have the usual OS Hyper bearing problems. I have been using the stainless steel bearings from RC bearings. Now, dkshema says that the SS is bad and said in another fourm to use the plain old steel bearings. What is the consensus? Is the SS worth the extra couple bucks, or is it actually causing more harm than good? 4 out od 5 times it is just the rear bearing anyway.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-18-2010 03:04 AM  7 years agoPost 11
jasonrusso

rrApprentice

Haverhill,​Massachusetts

My Posts: All  Forum  Topic

Did I kill this thread?

PM  EMAIL  GALLERY  Attn:RR  Quote
10-18-2010 04:57 AM  7 years agoPost 12
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

SS bearings will give you little in terms of longevity, as you have found. Purchase the usual high quality chrome/steel bearing and use some preservative oil. You WILL still need to replace them once or maybe twice a season if you fly a great deal, but that will be more due to plain old wear and tear than rust/corrosion.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2010 03:27 PM  7 years agoPost 13
wore-out-pilot

rrApprentice

Jeffersonville, ​Indiana USA

My Posts: All  Forum  Topic

Here's what the President of WILDCAT FUELS has to say about running your engine dry.

Here is what Jerry from Wildcat fuels had to say about running your engine dry. I hope this will help a few of you out. He knows what he is talking about.
Wildcat Fuels
Status: Senior Heliman

Registered: Mar 2002
Location: Lexington, Ky Rust

cjcraigj,

Do not run your engines out of oil! This is an old wives tale that there is some kind of benefit to doing this. First, by running the engine out of oil you are introducing the one this "during running" that you have been trying to avoid the entire flight....a lean run situation both starving the engine of lubrication and coolant. The residual oil in the engine protects the engine not hurts it. As for the residual fuel picking up moisture...not true. By starving the engine of its lubricant while running can cause damage to the engine. The flash point of the fuel is 53 degrees F and the engine temp is around 240 Degrees. Any residual fuel will evaporate before the model cools down....leaving.....oil. As for any rusting problems all I can say is that in 13 years and millions of gallons of fuel produced we have never had a complaint. The oil content of the Helimix 30% is 18% HV and will provide exceptional amounts of oil for the motor.
03-20-2005 Over year old.

MAKE-IT-HOT They call me aka the hammer

MAKE-IT-HOT They call me aka the hammer

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2010 04:12 PM  7 years agoPost 14
GMPheli

rrElite Veteran

W. Bridgewater, MA​USA

My Posts: All  Forum  Topic

Everyone has their opinions. The problem with running your engine too lean is it runs too hot, the oil reaches its flash point causing metel to metal contact and you seize. Running your engine dry at idle does not get it too hot. Try this, run your engine dry at idle, and then pull the backplate. You will be able to pour out oil. Running an engine dry at idle does not stave it for lube. There is no problem with doing this. Many of us have done it for many many years with no ill effects. You have to decide what works best for you. A coolpower employee once told a member here that the oil used in coolpower protects as good or better than castor at high heat. He did not know what he was talking about. Just because someone works somewhere or sells something does not mean that they know everything about it. When I was a kid I flew control line all the time. Guess what? The engines ran out of fuel at full throttle every flight. Control line engines lasted a long time for me.

PM  EMAIL  GALLERY  Attn:RR  Quote
11-22-2010 08:09 PM  7 years agoPost 15
supertigre

rrApprentice

Castle Rock,​Colorado

My Posts: All  Forum  Topic

Stainless steel bearings will last many times that of chrome steel IF you have a problem with rust! Otherwise, they will both last the same amount of time. I don't know why it is but my chrome steel bearings always seem to last longer than OEM, and I sell MANY times more stainless bearings than chrome steel.

Also, something to think about regarding running your engine "dry". If you run the engine until it quits, how could you be losing all the oil? The engine quits because there is no more fuel getting in. Right up until it quits, it is getting oil. Also, only a tiny portion of the oil is needed to lube the bearings. Most all of the oil goes out the exhaust. If these engines used needle bearings on the conrod, the oil percentage could be reduced substantially.

Paul Mcintosh
Owner-CRCustom.com - custom vinyl lettering, banners, signs

PM  EMAIL  Attn:RR  Quote
11-23-2010 12:51 AM  7 years agoPost 16
Gearhead

rrMaster

Vt

My Posts: All  Forum  Topic

well I for one are/is/am going gas

""Any residual fuel will evaporate before the model cools""

maybe someone should test that out, fill up, fly, land, let it cool, remove the Back Plate and put a flame to the Back Plate/see if there is fuel on it

Jim
Buzz Buzz Buzz

PM  EMAIL  GALLERY  Attn:RR  Quote
11-23-2010 01:24 AM  7 years agoPost 17
Inspector Fuzz

rrKey Veteran

NLA

My Posts: All  Forum  Topic

Ever notice it's the back bearing and not the front that rusts?

They both live in the same humid air that you store the model, so why is it that the back one rusts? In fact, the front bearing get 10 times LESS oil than the back one and still never rusts.

It's the acidic byproduct of the combustion of nitromethane that does it.

If you cut down on the nitro content to 15% or less and have 20 to 50% of your oil package as castor the problem virtually goes away.

PM  EMAIL  Attn:RR  Quote
11-23-2010 03:41 AM  7 years agoPost 18
baby uh1

rrVeteran

St. James, Mo.

My Posts: All  Forum  Topic

Food for thought! Recently I had to go through the estate from my childhood home. In the very damp basement was a tool box that we kept our old control line stuff from fourty plus years ago and in that box was an old Cox 049 that had been thrown in there after the plane it was attached to was crashed.
The castor oil had hardened and the motor was stuck but I put a little Croil in the exahust port and it freed right up! There is not a speck of rust anywhere on or in that engine so I'd say that castor oil protects from rust very well!

Anything is possible if you don't know what you are talking about!

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 1514 views
Scorpion Power Scorpion Power
HelicopterEngines Plugs Mufflers Fuel › Tried TT Redline 53 because of OS bearing issue.​Still same
 Print TOPIC  Make Suggestion 

 9  Topic Subscribe

Thursday, November 23 - 12:12 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online