R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 03-24-2009, 07:31 AM   #1
Tech Master
 
thenova70ss's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jun 2008
Location: Arkansas
Posts: 1,555
Trader Rating: 52 (100%+)
Default How to check for an air leak

Hey guys i have a Mugen MR Ninja .21 the motor has around 2gal and has ran GREAT but this last weekend at the races it started to give me troubles.I had a great tune on it and was running in a race and half way about 3 Min's in to the race it started to Lean Bog on me so i came off the track and after the race i retuned it and ran a half a tank in it and it ran great so up comes the next race and it started out Great but about 5 min in to the race it starts to Lean Bog so i pulled it off the track all i can think is it has an Air Leak but what is th BEST way to check for an air leak.

P.S It is Lean Bog on the Bottom down the strate it will Bog and then pick up and run great.Could it be a Air leak on the LSN.
__________________
CHRIS CREWS
Pro Speed Racing Optima MX1 Buggy http://www.global-hobbies.com.my
Cold Fusion R/C Products Team Driver - www.coldfusionrcproducts.com
Rc Pro ProDucts Team Driver www.rcproproducts.com
Hobby Pro USA Team Driver www.vp-pro-usa.com
thenova70ss is offline   Reply With Quote
Old 03-24-2009, 07:35 AM   #2
Tech Addict
 
jamiekerr14's Avatar
 
Join Date: Dec 2008
Location: Uk
Posts: 607
Default

[url]http://www.youtube.com/watch?v=epEGetU7NFU[url]
__________________
Xray XB4
Supported By:
RC Disco

Last edited by jamiekerr14; 03-24-2009 at 08:14 AM.
jamiekerr14 is offline   Reply With Quote
Old 03-24-2009, 07:52 AM   #3
Tech Adept
 
Hitman Racing 1's Avatar
 
Join Date: Feb 2009
Location: Burleson Tx
Posts: 219
Default

could have air leak, but air leaks I have had caused the engine to rev real hard. To check for air leaks first pressure test your tank, plug the line going to pipe and suck air out throught the line going to motor, suck air out cap hole with tounge suck more air out etc etc, let it sit for a second with tounge capping the line then pop the top on fuel tank and see if it is holding pressure. For the motor take air filter off and maniflod, plug the carb and manifold hole with your fingers, attach fuel line to your hsn valve. fill a cup up with soapy water, i use a turkey baster to pump air into the fuel line while doing that I use a paint bruch to rub the suds over the motor checking all seals, carb etc etc. Hope this helps.
__________________
Sponsors: Wife & Daughter!
Hitman Racing 1 is offline   Reply With Quote
Old 03-24-2009, 07:54 AM   #4
Tech Master
 
thenova70ss's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jun 2008
Location: Arkansas
Posts: 1,555
Trader Rating: 52 (100%+)
Default

Link dose not work THANKS
__________________
CHRIS CREWS
Pro Speed Racing Optima MX1 Buggy http://www.global-hobbies.com.my
Cold Fusion R/C Products Team Driver - www.coldfusionrcproducts.com
Rc Pro ProDucts Team Driver www.rcproproducts.com
Hobby Pro USA Team Driver www.vp-pro-usa.com
thenova70ss is offline   Reply With Quote
Old 03-24-2009, 07:54 AM   #5
Tech Fanatic
 
wallot's Avatar
 
Join Date: Jan 2009
Location: Czech Republic
Posts: 870
Default

http://www.youtube.com/watch?v=epEGetU7NFU
__________________
DEX408 - Speed Passion Silver Arrow v2, LRP Dynamic 8
Dex410 V3 - Tekin RS Pro, 7.5t Redline
F1-09 - Tekin RS Pro, 17.5t Redline
Sakura Zero S - LRP Quantum, Saturn 20T
KoPropo Eurus
wallot is offline   Reply With Quote
Old 03-24-2009, 07:55 AM   #6
Tech Adept
 
Hitman Racing 1's Avatar
 
Join Date: Feb 2009
Location: Burleson Tx
Posts: 219
Default

Quote:
Originally Posted by thenova70ss View Post
Link dose not work THANKS
Its probably a video of what I just explained to you.
__________________
Sponsors: Wife & Daughter!
Hitman Racing 1 is offline   Reply With Quote
Old 03-24-2009, 09:57 AM   #7
Tech Master
 
Gary NJ's Avatar
 
Join Date: Jan 2004
Location: Long Island NY
Posts: 1,157
Trader Rating: 8 (100%+)
Default

Another way to check:

GMK Supply Leak-Seek-R
__________________
Gary - GMK Supply
www.gmksupply.com
Great products. Goofy names.
Gary NJ is offline   Reply With Quote
Old 03-26-2009, 07:05 PM   #8
Tech Addict
 
Join Date: Apr 2008
Posts: 544
Default

I didn't watch the videos, so you might have seen this already, but if you start up you engine and hold slight throttle. Take a can of carb cleaner or brake clean and spray the back plate seams and carb seals. If the engine quits instantly or bogs majorly, you have an air leak in that spot. Also, spray behind the flywhell to check if the front bearing is leaking.
Miniracer23 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Go-Tech Engines Thread MassiveMods Offroad Nitro Engine Forum 15106 06-26-2017 04:07 AM
eXpress Motorsports Jon Williams Team and Company Discussions 18296 11-16-2016 02:17 PM
Go Tech Engines pino Onroad Nitro Engine Zone 331 08-04-2009 08:39 PM
What really kills an engine shipwama Nitro Off-Road 44 01-10-2009 06:13 PM
Engine Tuning 101 (General Tuning) Kemorc Onroad Nitro Engine Zone 41 11-19-2007 06:04 PM
Fantom Engine Manual = ABC Engine Bible Horatio Monster Trucks 9 02-05-2007 07:35 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 02:47 AM.


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