START HERE |
|
Register | FAQ | PM | Events | Groups | Blogs | Calendar | Mark Forums Read |
Unregistered
|
600 Class Nitro Helicopters 600 Class Nitro Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar. |
|
LinkBack | Thread Tools | Display Modes |
09-13-2016, 11:34 PM | #1 (permalink) |
Registered Users
Join Date: Jun 2011
|
O.S. .50 Hyper bearings
Hey Guys, my O.S. 50 hyper is starting to run hot for no reason, after 5 !/2 gallons,so I'm tearing it down and replacing the bearings. I ordered a set of stainless steel bearing from Boca Bearing, but when they arrived both bearings were shielded on both sides. I called Boca and they said I could remove the shielding,or keep them on. What would you guys do?
|
Sponsored Links | |||
Advertisement |
|
09-14-2016, 05:26 AM | #2 (permalink) |
Registered Users
Join Date: Jul 2013
Location: Middle East
|
Both shields off for the rear. Wash it out to get rid of the grease.
Some remove the inner shield from the front, others leave it on. I have not seen anything conclusive for this |
09-14-2016, 08:29 AM | #3 (permalink) |
Registered Users
Join Date: Jul 2012
Location: EU
|
I ordered a stainless rear bearing with a metal separator, but then read that better go with plastic separator. Are Boca ones w/plastic separator or metal?
__________________
XL Power Specter w/Brain Trex 550L w/Brain2 Trex600N w/Spirit Trex500 Heli-X Spektrum DX8 Jumper T-Lite iCharger |
09-22-2016, 05:03 AM | #5 (permalink) | ||
Registered Users
Join Date: Jul 2012
Location: EU
|
So far so good with this rear bearing, it has a metal retainer, dismounted shields from both sides:
http://www.ebay.co.uk/itm/1905448760...%3AMEBIDX%3AIT BTW, when I know I`m gonna take a break for some time from flying my nitro, I do this maintenance as by Nick Maxwell:
__________________
XL Power Specter w/Brain Trex 550L w/Brain2 Trex600N w/Spirit Trex500 Heli-X Spektrum DX8 Jumper T-Lite iCharger Last edited by Ignatjev; 09-22-2016 at 07:20 AM.. |
||
09-26-2016, 03:57 AM | #6 (permalink) |
Registered Users
Join Date: Dec 2006
|
Over the years I haven't read of anyone getting better service from stainless over any other bearing type.
I just get a generic 6902 with a plastic retainer and treat it as a consumable. I will change the bearings at a ratio of 4 to 1, change the front as I change the back for a fourth time. I believe boca specialise in rc engines so if you ordered a 6902 and not a 6902-2xx I would want to know why they didn't supply what you asked for. Similarly the front bearing is available with the shield on one side only. I have seen bearings damaged removing shields and as the correct configuration bearings can be supplied you should get what you can use immediately. |
09-27-2016, 09:08 PM | #7 (permalink) |
Registered Users
Thread Starter
Join Date: Jun 2011
|
I decided to install both bearings with the metal shields on for a few reasons.
1. lube can pass through the metal shields. 2. the rear bearing shields are pressed on, so I did not want to damage the bearings by punching a hole in the shield to remove it. 3. the bearings were designed with the shields, and could keep debris out of the engine if the cage fails? (just being positive about it) Anyway, 31/2 tanks in and the engine runs like new and not running hot any more, which kinda makes you think. what's up with O.S. bearings? I always ran the engine dry at the end of the day. |
09-28-2016, 01:43 AM | #8 (permalink) |
Registered Users
Join Date: Jul 2013
Location: Middle East
|
Interesting, please post the progress.
Leaving the shields on the rear bearing doesn't seem to be common practice, so an opposing experience will be good to know. |
09-30-2016, 05:30 AM | #9 (permalink) | |
Registered Users
Join Date: Dec 2006
|
Quote:
I have been using Rapicon fuel and I get very good service from the bearings now. |
|
10-02-2016, 08:44 PM | #10 (permalink) |
Registered Users
Thread Starter
Join Date: Jun 2011
|
I run an air filter on my engine, so I expected my bearings to last longer than 51/2 gallons. One gallon per bearing is outrageous, there must have been a lot of sand and dust at your field. I run CoolPower heli fuel, which is supposed to have a rust inhibitor (after run oil) in it, still my bearings rusted anyway although I always ran my engine dry.
|
10-03-2016, 01:56 PM | #11 (permalink) |
Registered Users
Join Date: Dec 2006
|
Yep, no rhyme or reason why bearings just go bad no matter what we try and do to stop it.
Once you have the method sorted it isn't a very long job. When I was running an OS 50 in a hirobo Sceadu I could be ready to re-install the engine in 20 minutes from beginning to end. It takes a bit longer with the T-rex as the skids have to come off first. |
10-03-2016, 06:30 PM | #12 (permalink) |
Registered Users
Thread Starter
Join Date: Jun 2011
|
I think the next time I change bearings I'll go ceramic. Have you tried them?
|
10-04-2016, 02:09 AM | #13 (permalink) |
Registered Users
Join Date: Jul 2012
Location: EU
|
If it would solve the problem, everybody would be using ceramic bearings. Instead I think better try a quality Japan bearings, I`m going to try KOYO 69022RS and do maintenance with ATF after flights.
__________________
XL Power Specter w/Brain Trex 550L w/Brain2 Trex600N w/Spirit Trex500 Heli-X Spektrum DX8 Jumper T-Lite iCharger |
10-04-2016, 09:41 PM | #14 (permalink) |
Registered Users
Join Date: Sep 2009
Location: San Diego
|
Even better -
http://www.magnumfuels.com/store/bearings.php I am just breaking in my new motor with the center-glide bushing, But the lifetime warranty sounds good enough to give it a try...
__________________
Specter 700, Protos 700 Gasser, XLPower 550, Protos 380 - Jeti DS14 Citizen - #202 |
10-05-2016, 02:22 PM | #15 (permalink) | |
Registered Users
Join Date: Dec 2006
|
Quote:
The ceramic balls can break and go through the engine with spectacular results. |
|
10-12-2016, 02:23 AM | #16 (permalink) | |
Registered Users
Thread Starter
Join Date: Jun 2011
|
Quote:
engine of that class, the Nova Rossi .21 engine. Nova Rossi's top of the line engines all come with ceramic main bearings and run up to 40,000 rpm. One time I ran a Nova Rossi engine, thirteen gallons on the same ceramic bearing, the engine finally died of a connecting rod bushing failure, the main ceramic bearing was still good, it never had any rust issues. |
|
11-25-2016, 08:17 PM | #17 (permalink) | |
Registered Users
Join Date: Feb 2011
|
Quote:
__________________
www.facebook.com/rotorhedz Jeti DS-14: Align 700E/700L/700N/600N/550L/500E Raptor 90 G4.1 / Goblin 700-KSE |
|
11-27-2016, 07:24 PM | #18 (permalink) |
Registered Users
Join Date: Sep 2009
Location: San Diego
|
http://www.magnumfuels.com/store/bearings.php
Motor is broken in, runs like a champ, makes me wonder why guys still use rear bearings at all.
__________________
Specter 700, Protos 700 Gasser, XLPower 550, Protos 380 - Jeti DS14 Citizen - #202 |
Thread Tools | |
Display Modes | |
|
|