R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 02-11-2011, 12:30 PM   #1
Tech Adept
 
Join Date: Dec 2010
Posts: 247
Trader Rating: 1 (100%+)
Default Major Engine Problem

Engine has some tiny copper pieces in it and ground up of some of the piston. Engine wouldnt rev up very high at all.

For sure i know i need to replace teh piston, what about the rest of the engine components?

What else do you think i need to replace?

And do i need to break in the new piston and sleeve too?

Is O'donnell RACING fuel too low in oil content to break it in?

Thanks in advance...
looklikeaflip is offline   Reply With Quote
Old 02-11-2011, 12:55 PM   #2
Tech Elite
 
stefan's Avatar
 
Join Date: Aug 2001
Location: Bavaria, Germany
Posts: 3,273
Send a message via AIM to stefan
Default

Quote:
Originally Posted by looklikeaflip View Post
Engine has some tiny copper pieces in it and ground up of some of the piston. Engine wouldnt rev up very high at all.

For sure i know i need to replace teh piston, what about the rest of the engine components?

What else do you think i need to replace?

And do i need to break in the new piston and sleeve too?

Is O'donnell RACING fuel too low in oil content to break it in?

Thanks in advance...
It's most likely the brass bushing of your conrod that gave up.

basically got to check everything:
Bearings
Crankpin
Sleeve
Conrod
stefan is offline   Reply With Quote
Old 02-11-2011, 12:58 PM   #3
Tech Adept
 
Join Date: Dec 2010
Posts: 247
Trader Rating: 1 (100%+)
Default

Wow. Is that due to just wear and tear? or is it from putting a hot glow plug in instead of a medium.

(Its a .21 BB, dont ask why we did that hahahah)
looklikeaflip is offline   Reply With Quote
Old 02-11-2011, 08:13 PM   #4
Tech Addict
 
Join Date: Dec 2008
Posts: 729
Default

it depends what engine it is - the OS VZB uses the OS P3 plug, and thats the hottest plug available.
Some like it colder, others dont.
But from what you said, it does sound like the bushing in the rod gave out.
Give the engine a look through, maybe the piston and sleeve are still fine and all you need is a new rod.
__________________
Car-less (Velox V10 or 733) // RB T10.5"+" (JB Modified) // Bluebird BMS-990DMG (St) & BMS-631 (T/B) // ATS 16% // Capricorn Wheels // Protoform
"70% of the time, it works ALL the time"
DJ_Shakespear is offline   Reply With Quote
Old 02-11-2011, 10:57 PM   #5
Tech Fanatic
 
Speedypeterb's Avatar
 
Join Date: Oct 2002
Location: Pompano Beach FL.
Posts: 775
Trader Rating: 16 (100%+)
Send a message via AIM to Speedypeterb
Default clean

Quote:
Originally Posted by looklikeaflip View Post
Engine has some tiny copper pieces in it and ground up of some of the piston. Engine wouldnt rev up very high at all.

For sure i know i need to replace teh piston, what about the rest of the engine components?

What else do you think i need to replace?

And do i need to break in the new piston and sleeve too?

Is O'donnell RACING fuel too low in oil content to break it in?

Thanks in advance...
like Stefan said, check every thing internally, the smart thing would be to remove the bearings completely because if you leave them in some little piece may stick somewhere behind it and come out later that would suck it happened to me with a 250 honda bike drop a little piece of needle bearing in there put the new piston and sure enough it lodge in the piston 3 minutes after starting it up.
__________________
Team Kyosho, Team Epic, IDM Engines, J-Tech racing fuels, Airtronics, Superiorhobbies.com
Speedypeterb is offline   Reply With Quote
Old 02-12-2011, 02:58 AM   #6
Tech Adept
 
Join Date: Dec 2010
Posts: 247
Trader Rating: 1 (100%+)
Default

which bearing?
looklikeaflip is offline   Reply With Quote
Old 02-12-2011, 06:32 AM   #7
Tech Adept
 
gfilos's Avatar
 
Join Date: Aug 2008
Location: Greece
Posts: 230
Default

the rear bearing is crusial to be checked. i have seen several motor damages
from a rear bearing going bad and bearing balls going walks inside the engine...
So i would suggest check if all bearing balls are inside the bearing and also check if it can spin freely. It would be good to remove it and check it precisely.
__________________
Serpent 720 09 mega zx 12 dsII+, Serpent 733 nova 353 tuned/sirio XXXV
Futaba, Graupner, Hudy, RB fuel
gfilos is offline   Reply With Quote
Old 02-15-2011, 05:25 PM   #8
Tech Rookie
 
Join Date: Feb 2011
Location: Compton, Ca
Posts: 15
Cool Enigne Tear down

Quote:
Originally Posted by looklikeaflip View Post
Engine has some tiny copper pieces in it and ground up of some of the piston. Engine wouldnt rev up very high at all.

For sure i know i need to replace teh piston, what about the rest of the engine components?

What else do you think i need to replace?

And do i need to break in the new piston and sleeve too?

Is O'donnell RACING fuel too low in oil content to break it in?

Thanks in advance...
you need to break the eingine down and replace the con rod, possibly the piston and cylinder check the crank pin and make sure no other components were damaged then clean it, dip it and rebuild it.

i rebuild engines for $40.00 + parts, i break them in I also do engine mods, polish, porting, balancing,etc.

Adam
AMJA R/C Racing Inc.
AMJA R/C #1 is offline   Reply With Quote
Old 02-17-2011, 02:50 PM   #9
Tech Champion
 
YR4Dude's Avatar
 
Join Date: Sep 2004
Location: So Cal
Posts: 5,625
Trader Rating: 44 (100%+)
Default

Your fuel and plug is not the problem but your needle settings for your air fuel mixture when breaking in is most likely the cause. You probably had it too lean which is why the engine didn't get enough lubrication.

Anytime you rebuild a motor with new parts you have to break in all over again. In your case, you're replacing a piston, sleeve and rod. Thats practically a whole new engine.
YR4Dude is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
RB Concept Engine Thread.. r1harper Offroad Nitro Engine Forum 3649 12-08-2017 11:52 AM
AXE ROSSI Engine thread..... thenova70ss Offroad Nitro Engine Forum 425 05-27-2015 11:12 PM
MAJOR Engine troubles (i think...) new to rc cars Nitro Off-Road 33 04-17-2008 12:53 AM
T-Maxx Engine Problem HELP!!!! Lil Pinto Monster Trucks 7 11-07-2003 10:33 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 12:07 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net