R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 02-02-2009, 10:19 AM   #1
Tech Master
 
hobdog's Avatar
 
Join Date: Jul 2008
Location: Albany, OR.
Posts: 1,027
Trader Rating: 19 (100%+)
Default OS Speed info

I have a OS Speed that has around 5 gallons through it. I am wanting to run it this summer for my primary race engine. It runs good and idles perfect. I am getting quite a bit of leakage out of the front bearing so I was thinking of replacing it. Is the rear bearing in the speed a ceramic? I am just trying to decide if I should change it while I have it opened up. Also trying to decide if I should pinch it. Like I said it runs good but the pinch with the plug out is almost no existant, but it seems to have pretty good compression with the plug in. I just hate to mess with something that works, but I guess if I am doing it correctly, now would be the time to pinch it. Let me know what you guys think.
hobdog is offline   Reply With Quote
Old 02-02-2009, 10:29 AM   #2
Tech Master
 
ngo8's Avatar
 
Join Date: Apr 2003
Location: Winnipeg Manitoba Canada
Posts: 1,263
Send a message via ICQ to ngo8
Default

Quote:
Originally Posted by hobdog View Post
I have a OS Speed that has around 5 gallons through it. I am wanting to run it this summer for my primary race engine. It runs good and idles perfect. I am getting quite a bit of leakage out of the front bearing so I was thinking of replacing it. Is the rear bearing in the speed a ceramic? I am just trying to decide if I should change it while I have it opened up. Also trying to decide if I should pinch it. Like I said it runs good but the pinch with the plug out is almost no existant, but it seems to have pretty good compression with the plug in. I just hate to mess with something that works, but I guess if I am doing it correctly, now would be the time to pinch it. Let me know what you guys think.
The front bearing on the speed is not ceramic but the rear is dont touch that one .My front bearing on my speed was leaking oil and even though i was told it is normal behaviour, i put in a ceramic one there is still a little oil that comes out but its no biggie that motor still rules no matter what idles like forever and great fuel mileage enjoy it you still have another 5 gallons on it .
__________________
Xray|ORCA|Sanwa|Trinity|KoPropo
ngo8 is offline   Reply With Quote
Old 02-02-2009, 10:33 AM   #3
Tech Master
 
ngo8's Avatar
 
Join Date: Apr 2003
Location: Winnipeg Manitoba Canada
Posts: 1,263
Send a message via ICQ to ngo8
Default

http://www.amainhobbies.com/product_...oducts_id/6250
ohh yeah this is the one i used .
__________________
Xray|ORCA|Sanwa|Trinity|KoPropo
ngo8 is offline   Reply With Quote
Old 02-02-2009, 10:48 AM   #4
Tech Champion
 
Join Date: Aug 2008
Location: south florida
Posts: 7,704
Trader Rating: 163 (100%+)
Default

is it leaking out after it sits with after run in it? or is it when racing it? mine leak after i use after run and they sit for a while but they hold while the engine is running, if you are not having a tuning issue its probably just normal leakage
cjm1126 is offline   Reply With Quote
Old 02-02-2009, 10:56 AM   #5
Tech Addict
 
Maikaitan's Avatar
 
Join Date: Apr 2006
Posts: 516
Trader Rating: 2 (100%+)
Default

static leak on the speed is normal... front is a steel bearing, rear ceramic. i suppose you'll only need a conrod to get it to spec... as a worn rod will spoil the crank, which is not sold separately. with the plug out, it'll turn over as the pinch is not there. it'll still run nicely, in fact you'll have a little more top end. i think it's still good till it cannot idle properly... the bearings last a long time if you take care of it and it's not rusting...
__________________
HobbyThingzBlk 201-E, Tampines Street 23, #01-118, Singapore 520201. Tel: 65-67828311, HP: 65-97465015. www.hobbythingz.com, team@hobbythingz.com
Regional Sole Distributor for Team Associated, Orbit Electronics, J Concept and PolyButler. Dealer for Tamiya, Kyosho, GS, Proline, Byron, Os Engines, RB, Futaba, Sanwa, KO.....
Please note that we are closed every Tuesday and P.Holiday. Hours are: 12pm-9pm.
Maikaitan is offline   Reply With Quote
Old 02-02-2009, 11:57 AM   #6
Tech Master
 
hobdog's Avatar
 
Join Date: Jul 2008
Location: Albany, OR.
Posts: 1,027
Trader Rating: 19 (100%+)
Default

Quote:
Originally Posted by Maikaitan View Post
static leak on the speed is normal... front is a steel bearing, rear ceramic. i suppose you'll only need a conrod to get it to spec... as a worn rod will spoil the crank, which is not sold separately. with the plug out, it'll turn over as the pinch is not there. it'll still run nicely, in fact you'll have a little more top end. i think it's still good till it cannot idle properly... the bearings last a long time if you take care of it and it's not rusting...
Thanks for the responses guys. I never even thought about static leakage. I never used to use after run oil until I got this engine. The engine had been sitting a couple of weeks with after run oil in it. I probably had to much after run oil in it in the first place.
hobdog is offline   Reply With Quote
Old 02-02-2009, 12:57 PM   #7
Tech Master
 
rpm1968's Avatar
 
Join Date: Oct 2008
Location: Bend, OR
Posts: 1,449
Trader Rating: 18 (100%+)
Default

Just run it, run it and then run it some more.
rpm1968 is offline   Reply With Quote
Old 02-02-2009, 02:51 PM   #8
Tech Champion
 
Tony Newland's Avatar
 
Join Date: May 2005
Location: Utah
Posts: 5,764
Trader Rating: 50 (100%+)
Default

if your front bearig is leaking, 95% of the time the LSN is too rich

I personally have never witnessed a leaking front bearing.... only an engine tuned with a fat LSN and lean HSN.
__________________
Schumacher Factory Team - Core RC - Highest Servos - Avid - Lunsford - Bellgate Distributors - Jconcepts - www.Prime-hobby.com - IRCR
Tony Newland is offline   Reply With Quote
Old 02-02-2009, 06:43 PM   #9
Tech Master
 
hobdog's Avatar
 
Join Date: Jul 2008
Location: Albany, OR.
Posts: 1,027
Trader Rating: 19 (100%+)
Default

Quote:
Originally Posted by Tony Newland View Post
if your front bearig is leaking, 95% of the time the LSN is too rich

I personally have never witnessed a leaking front bearing.... only an engine tuned with a fat LSN and lean HSN.
That's funny that you say that. I have been thinking that the lsn could be a bit fat because after a long high speed run it would idle a bit high on occation. What was weird is that it would not always do it. I never messed with it because going off of smoke, there did not seem to be an exess of smoke of the bottom end, more of a consistant trail from bottom to top, and the engine could sit there for at least 10 seconds idling and take off clean. These engines run so good even if they are a bit off and I have always been one to leave it alone if it is working, but it would be nice to learn something. Keep the suggestions coming.
hobdog is offline   Reply With Quote
Old 02-03-2009, 05:03 AM   #10
Tech Regular
 
lowey79's Avatar
 
Join Date: Dec 2007
Posts: 356
Default

I would be careful about the type of after-run oil that you use in this engine as it has a silicone filled crank. Any petrolium based oils can make the silicone swell and possibly become disslodged which could destroy that motor...
lowey79 is offline   Reply With Quote
Old 02-03-2009, 08:21 AM   #11
Tech Regular
 
scoobie1's Avatar
 
Join Date: Apr 2007
Location: NorCal
Posts: 330
Trader Rating: 3 (100%+)
Default

Quote:
Originally Posted by Tony Newland View Post
if your front bearig is leaking, 95% of the time the LSN is too rich

+1

Hoby, change the rod...or it will end up like Rev's Speed
__________________
I live with fear every day...sometimes she lets me race!!!
scoobie1 is offline   Reply With Quote
Old 02-03-2009, 09:48 AM   #12
Tech Master
 
hobdog's Avatar
 
Join Date: Jul 2008
Location: Albany, OR.
Posts: 1,027
Trader Rating: 19 (100%+)
Default

Quote:
Originally Posted by scoobie1 View Post
+1

Hoby, change the rod...or it will end up like Rev's Speed
I believe it was you trying your hardest to replicate Rev's speed. It's a good thing you had a quality corner marshall (ha ha)!!
I have changed the rod once after break in, so i wouldn't think it needs it, but I will tear it down today and look at things. I have been using Monkey snot as my after run oil, I hope that it is not messing with the filled crank.
hobdog is offline   Reply With Quote
Old 02-03-2009, 11:29 AM   #13
Tech Regular
 
scoobie1's Avatar
 
Join Date: Apr 2007
Location: NorCal
Posts: 330
Trader Rating: 3 (100%+)
Default

If you changed it after break in, then you should be ok...and I will thank you again for saving my speed...

The thing about that runaway, was a wire broke on my lipo regulator. I had a throttle return band on it, but hadnt hooked it up... Its hooked up now. lol
__________________
I live with fear every day...sometimes she lets me race!!!
scoobie1 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tons of rc stuff for sale tons sell it all Munsonator08 R/C Items: For Sale/Trade 20 11-19-2008 02:21 AM
OS 12 TzR romuald31 Onroad Nitro Engine Zone 1444 08-09-2007 01:50 AM
iRacingWerkz Nitro Fest II @ Turf City(GP Offroad race registration, 10th June 2007) iRacingWerkz Singapore R/C Racers 83 06-11-2007 06:03 PM
iRacingWerkz Nitro Fest II @ Turf City(GP Offroad race registration, 20th May 2007) iRacingWerkz Singapore R/C Racers 122 05-28-2007 02:36 AM
F/S Kyosho mp 7.5 kanai 2, os vo1b tons of spares. lp1066 R/C Items: For Sale/Trade 24 03-06-2006 11:10 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 03:20 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net