R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 08-24-2009, 09:03 AM   #1
Tech Adept
 
j8ight13's Avatar
 
Join Date: Aug 2009
Location: Philadelphia,PA
Posts: 177
Trader Rating: 1 (100%+)
Default GRP untuned .21

I just picked up a untuned GRP for a great price NIB. Well I ran Nitrotane fuel and now ended up with a bad engine bearing. I was actually told not to use this fuel because it does this.

After I fix the bearing I wanted to know if i can run 20% with the current head shim? I know they come ready to run 30%, but the track I race on is small and you don't really need all that extra power running 30%. Any help would be great thanks!!
__________________
Team Losi/8ight 2.0-8ight-T 2.0 Hot Bodies/D8
Nova +4/ GRP MRT .21/GRP .21/GRP MRT .28/Ninja JX21/OS V-spec PROMOD
Hitec 7954HV,7955/ JR 9100s-t/ JR 8800s-t
GRP 2053, RE10, RE11, NOVA9901
DX3S/M11x
j8ight13 is offline   Reply With Quote
Old 08-24-2009, 01:56 PM   #2
Tech Regular
 
markr04's Avatar
 
Join Date: Jan 2009
Location: TX
Posts: 421
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by j8ight13 View Post
I just picked up a untuned GRP for a great price NIB. Well I ran Nitrotane fuel and now ended up with a bad engine bearing. I was actually told not to use this fuel because it does this.

After I fix the bearing I wanted to know if i can run 20% with the current head shim? I know they come ready to run 30%, but the track I race on is small and you don't really need all that extra power running 30%. Any help would be great thanks!!
The person who told you that Nitrotane eats bearings... ignore their advice from now on. You ended up with a bad bearing from something else, perhaps a defect.

If it's ready to run for 30% nitro, then it has an extra shim in it (or one thicker one). You don't need that extra shim for 20%, but it won't hurt anything.

I keep the extra shim in my engines and all I use is 20%. From what I've read here, a little extra shimming extends engine life at the expense of a little power loss. Maybe someone else will chime in and confirm that, though.
__________________
Xray 808 2010 Spec - O.S. V-Spec Speed - Airtronics M11-DSSS
Losi 8ight-T 2.0 - RB Killer 9 - Airtronics M11-FHSS-2
Losi XXX-CR - Tekin RS / Novak Ballistic 13.5 - Airtronics M11-FHSS-2
markr04 is offline   Reply With Quote
Old 08-24-2009, 08:43 PM   #3
Tech Master
 
Join Date: Jul 2007
Location: Rossville Ga
Posts: 1,398
Trader Rating: 10 (100%+)
Default

Front or rear bearing? This is not common. What makes you feel the bearing is bad?
bigde2001 is offline   Reply With Quote
Old 08-25-2009, 08:07 AM   #4
Tech Adept
 
j8ight13's Avatar
 
Join Date: Aug 2009
Location: Philadelphia,PA
Posts: 177
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by bigde2001 View Post
Front or rear bearing? This is not common. What makes you feel the bearing is bad?
Yeah I know it's not common. Ive never had any bearing problems before. I figured the bearing went after i started the engine and warmed it up for a race on sunday. Well I couldn't really hear the exhaust it was mostly this loud sheering(sp) sound coming right from the crankcase. At first I thought it's just the flywheel and clutch bell rubbing together or something in that matter . Nope, it was the rear bearing. I took both the front and rear out last night. I actually picked up a front and rear replacement just in case this happened.

I just started it up this morning after the rebuild and it runs great. No more sheering(sp) or anything. Im running a few tanks in "break-in" settings for the new fuel. I went with Trinity 25%. Ive never had any issues with it.


I really wanted to use the Nitrotane. I was actually just about to switch over my V-spec until that happened with my GRP. I don't know if it was the fuel or not, but anyone who got the fuel from the shop has blown one of their bearings. Its been about 5-6 guys now with the same issue.
__________________
Team Losi/8ight 2.0-8ight-T 2.0 Hot Bodies/D8
Nova +4/ GRP MRT .21/GRP .21/GRP MRT .28/Ninja JX21/OS V-spec PROMOD
Hitec 7954HV,7955/ JR 9100s-t/ JR 8800s-t
GRP 2053, RE10, RE11, NOVA9901
DX3S/M11x
j8ight13 is offline   Reply With Quote
Old 08-25-2009, 09:14 AM   #5
Tech Regular
 
markr04's Avatar
 
Join Date: Jan 2009
Location: TX
Posts: 421
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by j8ight13 View Post
I really wanted to use the Nitrotane. I was actually just about to switch over my V-spec until that happened with my GRP. I don't know if it was the fuel or not, but anyone who got the fuel from the shop has blown one of their bearings. Its been about 5-6 guys now with the same issue.
My bad, I didn't consider a bad batch problem.

A similar thing happened with Sidewinder fuel. There was a bad batch that affected quite a few people, but it wasn't a bearing problem.

I don't remember if it damaged engines. I do know that people bought new engines because they assumed their engines were shot. It took a while before it was traced down to a bad batch of fuel.
__________________
Xray 808 2010 Spec - O.S. V-Spec Speed - Airtronics M11-DSSS
Losi 8ight-T 2.0 - RB Killer 9 - Airtronics M11-FHSS-2
Losi XXX-CR - Tekin RS / Novak Ballistic 13.5 - Airtronics M11-FHSS-2
markr04 is offline   Reply With Quote
Old 08-25-2009, 02:18 PM   #6
Tech Addict
 
v6shooter's Avatar
 
Join Date: Aug 2008
Location: Bakersfield ,CA
Posts: 588
Default

Had same problem with sidewinder. bad fuel
v6shooter is offline   Reply With Quote
Old 08-26-2009, 08:04 AM   #7
Tech Adept
 
j8ight13's Avatar
 
Join Date: Aug 2009
Location: Philadelphia,PA
Posts: 177
Trader Rating: 1 (100%+)
Default

What happened with the sidewinder fuel?
__________________
Team Losi/8ight 2.0-8ight-T 2.0 Hot Bodies/D8
Nova +4/ GRP MRT .21/GRP .21/GRP MRT .28/Ninja JX21/OS V-spec PROMOD
Hitec 7954HV,7955/ JR 9100s-t/ JR 8800s-t
GRP 2053, RE10, RE11, NOVA9901
DX3S/M11x
j8ight13 is offline   Reply With Quote
Old 08-27-2009, 12:59 PM   #8
Tech Master
 
mikesd1980's Avatar
 
Join Date: Mar 2009
Location: NE, Pa
Posts: 1,281
Trader Rating: 67 (100%+)
Default

I brought some of that nitrotane. I heard about eating bearings. I ran 1 tank of it through my truggy and got the call not to use it. Now I use it to burn ants arounds the house. I know the 6-7 guys who had to change there bearings due to this fuel.
__________________
Mike Diggs
Agama USA buggy
Agama USA Ebuggy - Airtronics M12
Agama A8T Truggy - Hobbyprousa -NemoRacing
"Our perception and attitude toward any situation will determine the outcome"
mikesd1980 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
GRP... Engine... Thread... xlgraphicspro Offroad Nitro Engine Forum 2135 09-10-2013 08:46 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 03:50 AM.


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