R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 08-18-2008, 08:03 PM   #1
Tech Master
 
Join Date: Oct 2002
Location: KY
Posts: 1,152
Trader Rating: 95 (99%+)
Default Air Leaks-----How do you check for them...

As the title says. I don't need to hear how to seal an engine or anything. I want to know how you can test for them and identify them. I don't necessarily think I have one but I would like to make sure.
__________________
www.rcrcr.com --------> B-Mag free since fall '07
RobbieS is offline   Reply With Quote
Old 08-18-2008, 08:14 PM   #2
Tech Addict
 
wes95_z28's Avatar
 
Join Date: Nov 2006
Location: Norman, Ok
Posts: 747
Trader Rating: 3 (100%+)
Default

Everytime you run it you should check for a leak, they are easy to find. Just look for a wet, greasy or spot where allot of dirty gunk builds up on the motor. Thats where the leak will be.

If the motor is clean in all areas you should be good to go.
__________________
Wes

Kyosho 777 WC w/ big bores, RB S5, ACE 1313 s., Air 357 t., JP-3
HPI Savage X SS, Axial .28, Hitec 5645 Steering servo
Nitro TC3, O.S. .18 CV-R
Associated RC18T, Brushless, Lipo
wes95_z28 is offline   Reply With Quote
Old 08-18-2008, 08:14 PM   #3
Tech Addict
 
Steve Walters's Avatar
 
Join Date: Oct 2006
Posts: 662
Trader Rating: 1 (100%+)
Default

While the motor is running (Idle) lightly spray a nitro cleaner around the case, carb and black plate. IF the motor instantly dies, it has a air leak. Keep it away of the air filter. The fumes can kill it too...
__________________
"CVR" Central Valley Raceway (Madera, CA)
Team "WTF" Racing member
TEAM BCE (Product/Field Tester)

X-Ray 808 (Active Diff)
BCE 8X8 Pro Chassis
OS Speed (XCustoms Head Mod)
Hitec 5995TG (S&T)
M11 & Spectrum.

Last edited by Steve Walters; 08-18-2008 at 08:46 PM.
Steve Walters is offline   Reply With Quote
Old 08-22-2008, 06:04 AM   #4
Tech Rookie
 
turnpike_cruise's Avatar
 
Join Date: Jul 2008
Location: Toledo, OH USA
Posts: 19
Default OS 18TM stalls

I have a Revo with an OS 18TM. The engine will start and idle for quite a while. However, when I try to drive it, it will go about 20 feet and then die. I was thinking air leak, but I am not sure.

I swapped the exhaust, fuel tank, and replaced fuel line. The one thing I am noticing is when the truck dies, the fuel line is empty. I am loosing prime for some reason.

Would this be a result of an air leak around the carb?

Thanks,
-dave
turnpike_cruise is offline   Reply With Quote
Old 08-22-2008, 06:28 AM   #5
Tech Addict
 
Join Date: Apr 2007
Posts: 696
Trader Rating: 19 (100%+)
Default

Possibly an air leak, more likely needle settings.
__________________
Dirt's for racing,asphalt's for getting there!
pooldoc is offline   Reply With Quote
Old 08-22-2008, 07:06 AM   #6
Tech Master
 
vti-chris's Avatar
 
Join Date: Jan 2005
Location: Cyprus
Posts: 1,075
Trader Rating: 3 (100%+)
Default

I never check for air leaks...i just make sure i don't have any by using red silicone everywhere.
-Back plate
-Carb neck
-Carb boot
-Crank collet
-and finally white teflon tape around the threads of all carb needles.

This way you KNOW that if it doesn't run-tune, it's NOT because of air leaks.
__________________
Xray/OS/Savox/Sanwa
Axial XR10
Sakura Zero S/Castlecreations
RCO
vti-chris is offline   Reply With Quote
Old 08-22-2008, 06:49 PM   #7
Tech Master
 
Join Date: Oct 2002
Location: KY
Posts: 1,152
Trader Rating: 95 (99%+)
Default

Quote:
Originally Posted by vti-chris View Post
I never check for air leaks...i just make sure i don't have any by using red silicone everywhere.
-Back plate
-Carb neck
-Carb boot
-Crank collet
-and finally white teflon tape around the threads of all carb needles.

This way you KNOW that if it doesn't run-tune, it's NOT because of air leaks.
I'm not into the whole sealing up my motor with rtv thing. I acquired a motor from someone who had and it was just a pain to do any maintenance on.

I do like the teflon tape for needles that might be just a touch loose. It will definitely help keep them in place.
__________________
www.rcrcr.com --------> B-Mag free since fall '07
RobbieS is offline   Reply With Quote
Old 08-26-2008, 05:15 PM   #8
Tech Master
 
j_blaze14's Avatar
 
Join Date: Feb 2008
Location: Tampa, Fl
Posts: 1,693
Trader Rating: 34 (100%+)
Default

1. remove motor from car
2. install 6" piece of fuel line onto carb
3. spray motor with simple green
4. listen and look for bubbles, theres your leak.

**it is normal for the front bearing to leak a very minute amount when the motor is cold. **
j_blaze14 is offline   Reply With Quote
Old 08-26-2008, 08:17 PM   #9
Tech Addict
 
smb17's Avatar
 
Join Date: Jun 2008
Posts: 592
Trader Rating: 13 (100%+)
Send a message via AIM to smb17
Default

use soapy water and a brush. put fuel line on the hsn and blow while holding the intake and exhaust ports. Brush the soapy water on areas of concern.
__________________
-
smb17 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Hey Check This Out! dlarry Florida Racing 2 11-29-2007 04:20 PM
Check this out... fastfurious Other Items: For Sale/Trade or Wanted to Buy 1 05-09-2006 11:18 AM
Check this out. nitrous36 Electric Off-Road 1 07-12-2004 05:13 PM
Check out what this guy is doing mistercrash Nitro On-Road 4 10-06-2003 09:37 AM
Check this out KINGZJ Electric On-Road 8 08-09-2003 06:39 PM



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 08:32 PM.


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