R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 12-10-2009, 08:44 PM   #1
Tech Adept
 
Join Date: Dec 2009
Location: NE florida
Posts: 215
Trader Rating: 9 (100%+)
Default Why is my rossi running so hot?

I have a rossi .28 in a truggy and when im running it it will get pretty hot when im on the throttle a lot and bring it right in a take the temp. It has read over 300 a few times. When the truck is just driving around at low speeds and never really getting up to top speed in doesnt seem to do this.
Now it seems like a classic low speed is rich to fix lean high speed but there is a pretty good amount of smoke coming out.
It's not the clutch or drive train since it's all free spinning and the clutch is brand new.
Could it still be the low speed rich high speed lean thing?
The truck never stays at those hot temps, it goes right back down after idling for 10 secs or so.
Preston777 is offline   Reply With Quote
Old 12-10-2009, 08:49 PM   #2
Tech Prophet
 
tc5 man's Avatar
 
Join Date: Oct 2007
Location: levittown pa
Posts: 16,873
Default

to me that defiely sounds like a air leak somewhere my nova .21 bf was
doing the same thing.
tc5 man is offline   Reply With Quote
Old 12-10-2009, 08:53 PM   #3
Tech Adept
 
Join Date: Dec 2009
Location: NE florida
Posts: 215
Trader Rating: 9 (100%+)
Default

yeah i thought that might be what is was but i sealed the engine when i got it so i have no idea. I took it out and did the soap and water test to check and i couldnt see any leaks. Unless it's the front bearing. It doesnt leak from what i could tell just a little nitro sometimes but i havent seen an engine that doesnt do that.
Preston777 is offline   Reply With Quote
Old 12-10-2009, 08:54 PM   #4
Tech Prophet
 
tc5 man's Avatar
 
Join Date: Oct 2007
Location: levittown pa
Posts: 16,873
Default

Quote:
Originally Posted by Preston777 View Post
yeah i thought that might be what is was but i sealed the engine when i got it so i have no idea. I took it out and did the soap and water test to check and i couldnt see any leaks. Unless it's the front bearing. It doesnt leak from what i could tell just a little nitro sometimes but i havent seen an engine that doesnt do that.

what about the carberator
tc5 man is offline   Reply With Quote
Old 12-10-2009, 08:55 PM   #5
Tech Master
 
NitroFreakManHo's Avatar
 
Join Date: Mar 2008
Location: Upstairs, Canada
Posts: 1,142
Trader Rating: 3 (100%+)
Send a message via MSN to NitroFreakManHo Send a message via Skype™ to NitroFreakManHo
Default

Is it preforming well, with no bogging, flat spotting, or high idling off of the jumps ? You say you have smoke, and your drivetrain is freed up, so I'm guessing that maybe your temp gun is the culprit.

Take the head off the engine, and check to see if there any pitting on the head button and/or piston. If there is, then you've ran it too lean a few times.
__________________
TEAM TERRIBLES √ 2009/2011 SORRCC Points Series Truggy Champ
CRE Werks B5 powered Serpent 811-T
CRE Nova P5 Powered Serpent 811-B
**M2C**Hitec 7955TG Servos**Buku Clutch
www.apaarchery.com www.skoffroad.ca www.youtube.com/nitrofreakmanho
NitroFreakManHo is offline   Reply With Quote
Old 12-10-2009, 09:01 PM   #6
Tech Adept
 
Join Date: Dec 2009
Location: NE florida
Posts: 215
Trader Rating: 9 (100%+)
Default

Now that i think about it my temp gun might be wrong. and yes i the carb is sealed as well tc5. I will go buy a new temp gun and see what it has to say. I'll check the head button and piston as well.
Preston777 is offline   Reply With Quote
Old 12-10-2009, 09:03 PM   #7
Tech Champion
 
Tony Newland's Avatar
 
Join Date: May 2005
Location: Utah
Posts: 5,764
Trader Rating: 50 (100%+)
Default

Quote:
Originally Posted by NitroFreakManHo View Post
your temp gun is the culprit.

Take the head off the engine, and check to see if there any pitting on the head button and/or piston. If there is, then you've ran it too lean a few times.
Both good things to look for, temp with a selecton of guns next time out..... the plug will distort and tell you its detonating before the button or piston gets pitted..... take a good look at the plug, with a magnifying gass if you can get one.

Other than that I would say richen that beast up on top.... if the idles wants to drop, lean the bottom out alittle. Basically run the top just a tad richer than top speed achieved..... If your straight at the track is super long the engine can literally be running out of fuel being on the high side needle for so long and temps will rise very fast in that condition. Smoke isn't thedetermining factor for me really.... I can make an engine bellow smoke and run 300'... too rich will cause heat also .28s arent exactly RPM monsters, the piston, rod and cranks in them are alot heavier than .21s so typically a .28 will turn 5,000+ less RPM and usually need a taller clutch bell to achieve the same speed.
__________________
Schumacher Factory Team - Core RC - Highest Servos - Avid - Lunsford - Bellgate Distributors - Jconcepts - www.Prime-hobby.com - IRCR
Tony Newland is offline   Reply With Quote
Old 12-10-2009, 09:04 PM   #8
Tech Elite
 
imaxx21's Avatar
 
Join Date: Nov 2007
Location: FL
Posts: 2,725
Trader Rating: 1 (100%+)
Send a message via AIM to imaxx21
Default

put a drop of water on the head if it doesnt sizzle off instantly its not that hot...
__________________
-Crash
Upgrade RC www.upgrade-rc.com
imaxx21 is offline   Reply With Quote
Old 12-10-2009, 09:05 PM   #9
Tech Champion
 
Tony Newland's Avatar
 
Join Date: May 2005
Location: Utah
Posts: 5,764
Trader Rating: 50 (100%+)
Default

Quote:
Originally Posted by Preston777 View Post
Now that i think about it my temp gun might be wrong. and yes i the carb is sealed as well tc5. I will go buy a new temp gun and see what it has to say. I'll check the head button and piston as well.
Pick up an Odonnell gun..... been using mine for about 2 yrs without any issues and it within a few degrees of every excergen I've tested it against
__________________
Schumacher Factory Team - Core RC - Highest Servos - Avid - Lunsford - Bellgate Distributors - Jconcepts - www.Prime-hobby.com - IRCR
Tony Newland is offline   Reply With Quote
Old 12-10-2009, 09:18 PM   #10
Tech Adept
 
Join Date: Dec 2009
Location: NE florida
Posts: 215
Trader Rating: 9 (100%+)
Default

here are the pics of the piston head and the button. my gun read over 325 today when i was trying to figure out what was wrong and that doesnt seem possible with the plug still in tact.
Attached Thumbnails
Why is my rossi running so hot?-dsc00695.jpg   Why is my rossi running so hot?-dsc00697.jpg  

Last edited by Preston777; 12-10-2009 at 10:11 PM.
Preston777 is offline   Reply With Quote
Old 12-10-2009, 09:53 PM   #11
Tech Champion
 
Tony Newland's Avatar
 
Join Date: May 2005
Location: Utah
Posts: 5,764
Trader Rating: 50 (100%+)
Default

That plug doesnt look good at all..... and the carbon trail to the exhaust port on the piston tells me its been run pretty lean. I think your gun is right

Anytime the glow element (the coil) is dull, grey or white basically anything but shiny its a bad thing

You running odonnell fuel by chance?
__________________
Schumacher Factory Team - Core RC - Highest Servos - Avid - Lunsford - Bellgate Distributors - Jconcepts - www.Prime-hobby.com - IRCR
Tony Newland is offline   Reply With Quote
Old 12-10-2009, 09:59 PM   #12
Tech Adept
 
Join Date: Dec 2009
Location: NE florida
Posts: 215
Trader Rating: 9 (100%+)
Default

i did run maybe 2 or 3 tanks of it through it but i am running sidewinder now. Does that carbon trail mean the motor is going to be bad? or will it be okay if i richen things up and get it tuned right.
Preston777 is offline   Reply With Quote
Old 12-10-2009, 10:13 PM   #13
Tech Adept
 
Join Date: Dec 2009
Location: NE florida
Posts: 215
Trader Rating: 9 (100%+)
Default

what plugs would you recommend running in it? i have been using medium O.S. plugs. something that would be better?
Preston777 is offline   Reply With Quote
Old 12-10-2009, 10:19 PM   #14
Tech Champion
 
Tony Newland's Avatar
 
Join Date: May 2005
Location: Utah
Posts: 5,764
Trader Rating: 50 (100%+)
Default

It looks like an odonnell engine by the color of everything, not a bad thing

It'll be fine... throw that plug at the guy that sold it to you and get a longer plug.... take a close look at how far the plug goes into the combustion chamber.... the OS plugs are shorter than regular plugs. Thats a contributing factor to your tuning issues, your essentially running a super cold plug. OS plugs typically only fit in OS engines. Pick up some regular Odonnell 97's and tune those in, start from scratch. Richen the HSN 1/2 turn and start over
__________________
Schumacher Factory Team - Core RC - Highest Servos - Avid - Lunsford - Bellgate Distributors - Jconcepts - www.Prime-hobby.com - IRCR
Tony Newland is offline   Reply With Quote
Old 12-10-2009, 10:25 PM   #15
Tech Adept
 
Join Date: Dec 2009
Location: NE florida
Posts: 215
Trader Rating: 9 (100%+)
Default

yeah i thought it didnt look right sitting in there haha. Im just going to go back to the factory settings and redo it. I am going to pick up a new temp gun though. I have a duratrax one and i dont like it at all. Are the 97's a turbo only plug? it's a standard plug engine.
Preston777 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
STS engines sparksy Onroad Nitro Engine Zone 2774 02-03-2013 06:05 AM
Axe Rossi Mamba sport10 Nitro Off-Road 110 01-30-2010 09:12 PM
RC car- True Turbocharger. 1BadTransam Nitro On-Road 144 08-02-2009 11:17 PM
Engine seems to run hot... Yet there is nice trails of smoke. mini696 Nitro Off-Road 25 11-04-2008 02:26 AM
AXE ROSSI ENGINES??? EVIL-ET Onroad Nitro Engine Zone 15 12-13-2007 09:43 PM
STS D21T & D21B porter Electric Off-Road 31 01-16-2007 12:30 AM
What is the best way to break in a new ening? adsl Onroad Nitro Engine Zone 27 02-10-2005 07:49 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 02:41 AM.


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