R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 09-30-2008, 11:57 AM   #1
Tech Master
 
t0adman's Avatar
 
Join Date: Apr 2008
Location: Seattle, WA
Posts: 1,239
Trader Rating: 8 (100%+)
Default OS V-Spec Rebuild - Part Dos

Some of you may recall a post from me a while back about how my first gen V-Spec started flaming out and sounding terrible. I took it apart, baked it in the oven, removed and replaced the front and rear bearings, replaced the con-rod, and put it all back together...correctly I think.

FF to last Saturday. I was at the track and decided I would try to get the thing running. I got it fired up but could only keep it running when it was around 1/3 throttle and that was idle RPMs. I took off the air filter to see what was going on with the car and it was spitting fuel out and all over the buggy. Not a ton but I don't except to see any fuel coming OUT of the carb intake. I put all the needles at factory settings then cranked them down a little so it wouldn't be super rich. I can get it started and it will rev up well but it's rich and won't idle normally.

What do you think is going on? In what order should I start checking things and troubleshooting?
t0adman is offline   Reply With Quote
Old 09-30-2008, 01:15 PM   #2
Tech Elite
 
AssocRacer's Avatar
 
Join Date: May 2005
Location: Greenfield, WI
Posts: 2,295
Trader Rating: 9 (100%+)
Send a message via AIM to AssocRacer Send a message via Yahoo to AssocRacer
Default

It's spitting fuel OUT OF the carb?
__________________
Lots O' Planes
AssocRacer is offline   Reply With Quote
Old 09-30-2008, 01:26 PM   #3
Tech Master
 
mugenb46's Avatar
 
Join Date: Jun 2006
Location: springfield tn
Posts: 1,385
Trader Rating: 4 (100%+)
Default

Quote:
Originally Posted by t0adman View Post
Some of you may recall a post from me a while back about how my first gen V-Spec started flaming out and sounding terrible. I took it apart, baked it in the oven, removed and replaced the front and rear bearings, replaced the con-rod, and put it all back together...correctly I think.

FF to last Saturday. I was at the track and decided I would try to get the thing running. I got it fired up but could only keep it running when it was around 1/3 throttle and that was idle RPMs. I took off the air filter to see what was going on with the car and it was spitting fuel out and all over the buggy. Not a ton but I don't except to see any fuel coming OUT of the carb intake. I put all the needles at factory settings then cranked them down a little so it wouldn't be super rich. I can get it started and it will rev up well but it's rich and won't idle normally.

What do you think is going on? In what order should I start checking things and troubleshooting?
normally a v spec will spit fuel out the carb when it's very fat, this accures alot during breakin, and is a good sign that it has plenty of fuel running through it.

Check the plug, or did you change to a cooler plug, and are the correct shims installed in the head button.

When you where trying to get it to tune right before it may have put your settings way off.

Also, did you change pipes, this will change the tune also.
__________________
Brian Carey
Pro Twister Mods
brian@protwistermods.com
615-838-5373
mugenb46 is offline   Reply With Quote
Old 09-30-2008, 02:06 PM   #4
Tech Rookie
 
Join Date: Apr 2008
Location: Cypress, CA.
Posts: 4
Default

A buddy of mine had a very similar sounding issue last week. It turned out that he had reinstalled the piston backwards. It would run if the throttle was held open some but did not idle at all. Remember that the skirt of the piston should be towards the back plate.

If this is the case just be glad it is an OS, becuse many other engines would have broke the piston skirt off.
__________________
Justin Watson
you can't beat a LOSI
Team LOSI Racing
Airtronics
Fusion Motorsports
Jwatson is offline   Reply With Quote
Old 09-30-2008, 02:43 PM   #5
Tech Master
 
t0adman's Avatar
 
Join Date: Apr 2008
Location: Seattle, WA
Posts: 1,239
Trader Rating: 8 (100%+)
Default

Thanks for the good feedback guys. I'll go home tonight and make sure I have the damn piston in correctly.
t0adman is offline   Reply With Quote
Old 09-30-2008, 05:38 PM   #6
Tech Master
 
mugenb46's Avatar
 
Join Date: Jun 2006
Location: springfield tn
Posts: 1,385
Trader Rating: 4 (100%+)
Default

Quote:
Originally Posted by t0adman View Post
Thanks for the good feedback guys. I'll go home tonight and make sure I have the damn piston in correctly.
also for safe measure, be sure the rod is installed right, both sides look the same, but look at the bottom bushing, the side with the chamfered edge, goes in facing the crank. Good luck.


And, yes the motor will run with the piston in backwards, and dies at low RPM because once the boost side of the piston clears the exaust, all case preasure esscapes.
__________________
Brian Carey
Pro Twister Mods
brian@protwistermods.com
615-838-5373
mugenb46 is offline   Reply With Quote
Old 09-30-2008, 09:26 PM   #7
Tech Apprentice
 
rcdaddy's Avatar
 
Join Date: May 2008
Location: WCRC Track Manager
Posts: 79
Default

Definitly the piston is in backwards. Lets just say that is for sure what it is. Lets not talk about how I know for sure that is the problem.







I done the same thing. Surprizingly the motor will run, it just wont idle.
__________________
Drive It Hard and it Will Be Fast
Nova Rossi, Jammin, Team Associated, OS Engines, Futaba, Airtronics, Go Engines, RB Mods, Fusion Motorsports
WCRC Raceway
Big Billy's RC World
Baity's RC
rcdaddy is offline   Reply With Quote
Old 10-01-2008, 02:05 PM   #8
Tech Master
 
sickjamminracer's Avatar
 
Join Date: Jan 2008
Location: BEAVER FALLS,PA
Posts: 1,729
Trader Rating: 23 (100%+)
Default

if its not that then try a different glow plug
__________________
www.myspace.com/krystallinemusic
W.P.A.C crawlers
The Raceway
sickjamminracer is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Hpi Pro 4 Barry White Electric On-Road 16052 08-08-2017 02:05 PM
2006 Reedy Touring Car Race of Champions MikeR Racing Forum 230 05-30-2006 08:39 PM
FW-05 Parts windix60 R/C Items: For Sale/Trade 5 10-06-2004 06:59 AM
MARCCA Sedan Novak Spec class GordonFreeman MARCCA Discussion 32 03-23-2004 10:57 PM
tons of used tc3 parts all mint shape updated list more added today jan 25th jason cheng R/C Items: For Sale/Trade 0 01-25-2004 04:08 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 04:18 PM.


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