R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 04-12-2007, 12:59 AM   #1
Tech Addict
 
32819toon's Avatar
 
Join Date: Mar 2006
Location: North of England
Posts: 580
Trader Rating: 1 (100%+)
Default engine not behaving itself

Hi,
I'm trying to break in a new engine and am having loads of problems. I had starting problems, now I've managed to get 3 tanks through it, but it starts revving uncontrollably. It revs high when I close the carb (?? yeh really !! ??), and slows a bit when I open it. I'm noticing fuel on the chassis beside the engine. Do you think I have an air leak ? Where could it be from ?

Any ideas would be really appreciated.

Regards,
32819toon
32819toon is offline   Reply With Quote
Old 04-12-2007, 06:03 AM   #2
Tech Initiate
 
Thedub88's Avatar
 
Join Date: Aug 2006
Posts: 45
Default

Ya it sounds like an air leak, try this to make sure
http://www.rchobbies.org/engine-tuning.htm

as for the fuel on the ground, it's most likely oil, not fuel. This is a good sign meaning there is plenty of oil to lubracate your engine. This is normal because you always run rich during break in.

once break in is done you can lean out your engine to get better perforamnce.
This is for the savage and t-maxx, but is the same for all nitro engines

http://www.youtube.com/watch?v=oSmMzpZM_As
http://www.youtube.com/watch?v=BJFsJ...elated&search=
http://www.youtube.com/watch?v=pEGjE...elated&search=

hope this helps!
Thedub88 is offline   Reply With Quote
Old 04-12-2007, 06:51 AM   #3
Tech Addict
 
32819toon's Avatar
 
Join Date: Mar 2006
Location: North of England
Posts: 580
Trader Rating: 1 (100%+)
Default

Thanks dub88, excellent article, I'm gonna give that a try. I have the HPI DVD which is good, but it doesn't tell you about faults like this. I also have the Joel Johnson one aswell which give more tips and detail.
32819toon is offline   Reply With Quote
Old 04-12-2007, 02:17 PM   #4
Tech Initiate
 
Thedub88's Avatar
 
Join Date: Aug 2006
Posts: 45
Default

thank APOLLO
I got this artical off his guide from this other forum (which is much better than this one)http://www.rcuniverse.com/forum/default.asp?fh=1
Thedub88 is offline   Reply With Quote
Old 04-13-2007, 07:42 PM   #5
Tech Addict
 
Join Date: Nov 2004
Location: KISSIMMEE,FLORIDA
Posts: 700
Trader Rating: 2 (100%+)
Default

it can also be a lean low speed needle,try richening it up a 1/4 turn and see if it gets better.
__________________
Ahhh the smell of nitro in the morning!
Brooklyn Hobbies Team Driver
[url]www.brooklynhobbies.com[/url]
Team Trinity
[url]www.teamtrinity.com[/url]
Gary Figueroa
GFIGUEROA is offline   Reply With Quote
Old 04-13-2007, 11:40 PM   #6
Tech Adept
 
kyosho 444's Avatar
 
Join Date: Apr 2007
Posts: 172
Default

i have the same problem but i already broken it in (its a pull start)
kyosho 444 is offline   Reply With Quote
Old 04-14-2007, 12:55 PM   #7
Tech Addict
 
32819toon's Avatar
 
Join Date: Mar 2006
Location: North of England
Posts: 580
Trader Rating: 1 (100%+)
Default

I think I've found the leak, it is from under the glow plug. Fuel or oil is bubbling from under the glow plug even when the plug is tight. How can I sort this out ?
32819toon is offline   Reply With Quote
Old 04-16-2007, 05:39 AM   #8
Tech Addict
 
32819toon's Avatar
 
Join Date: Mar 2006
Location: North of England
Posts: 580
Trader Rating: 1 (100%+)
Default

Hi,
Got it idling reasonably by messing with the needle, although it still sounds really rough. I'm still a bit concerned about oil / fuel bubbling from under the glow plug. Anyone have any ideas about this ??
32819toon is offline   Reply With Quote
Old 04-16-2007, 02:32 PM   #9
Tech Adept
 
terry sturchio's Avatar
 
Join Date: Feb 2003
Location: Cheney, KS
Posts: 159
Default

If it's a turbo plug, pull the plug and put it back in again making sure it's snug. If it still leaks try a new plug.

If it's a standard plug, do the same, but make sure to use a new copper washer...or put a new plug in with a new copper washer.

It won't run right with a leak around the plug. It's not reaching full compression.
__________________
I'll race electric when batteries smell like nitro.
terry sturchio is offline   Reply With Quote
Old 04-16-2007, 11:24 PM   #10
Tech Addict
 
32819toon's Avatar
 
Join Date: Mar 2006
Location: North of England
Posts: 580
Trader Rating: 1 (100%+)
Default

Thanks Terry, I'll give that a try.
32819toon is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
GO 28R/Full Starter Engine GRracing Ver.Team Fully Modified Engine handpiece Onroad Nitro Engine Zone 0 07-28-2007 03:42 AM
Ofna Picco .21B 3 Port engine, good budget engine Cain Electric Off-Road 1 03-26-2007 08:32 AM
selling custom savage roller with engine, truck zillia modded engine.$275 pat360xboxhalo3 R/C Items: For Sale/Trade 2 01-11-2007 05:23 AM
Power capacitor behaving badly?? TC321go Electric On-Road 1 10-28-2003 04:13 AM
Engine Temperatures for Break-In and Normal Use for XTM 24.7 Engine. Head Shims? racer rich Nitro On-Road 0 12-13-2002 11:49 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 12:59 PM.


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